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    Calling Mechanical Engineers to collaborate on Twitter

    By saurabhjain

    If you are a mechanical engineering professional and have a twitter account .. we invite you in our mechanical engineering  campaign to collaborate on twitter.. Retweet the following status on https://twitter.com/mechportal/status/646544243649961985 Look forward for your presence. Regards Mechanical Engineeirng forum
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  • DrD

    A Question for Readers

    By DrD

    Many of you have asked me various questions, so now it is my turn. Let me lay a bit of background first, and then the questions.   I have had some conversations recently with JAG (one of the other writers here at ME Forums) regarding the choice of software for 3D modeling and analysis. JAG has made some excellent suggestions, specifically a cloud based program called Onshape. Unfortunately, for reasons that are unclear, my computer cannot run Onshape; I have worked with their help people for several hours, all to no avail. JAG recommends this in part because there is a "free version for the hobbyist" and a relatively inexpensive "full version for the professional." That is pretty attractive, but since I can't run it, I'm stuck.   I gather that virtually all engineering colleges these days are teaching some sort of 3D modeling and analysis software, but that raises a few questions in my mind. 1. If your college teaches brandX 3D software, what will you do when you go to work for a small company that cannot afford anything more than 2D drafting (simple CAD), with no analysis capability at all? How will you do your job then? You probably have your own pocket calculator, but will you have your own copy of ANSYS or Pro-E? 2. What software does your school teach (every students should have an answer to this question, so I expect lots of replies on this one!)? 3. If you have used software extensively for analysis of engineering problems (beam deflections, stress analysis, fluid flow, heat transfer, etc), are you confident  that you will be able to work all of those problems if there is no such software available to you on the job?   I might add, as sort of a postscript, most of you know that I am older than dirt (I just had another birthday, so the situation is even worse!), so I tend to look at things from an elderly perspective. One of my great fears as a working engineer was "What will happen when I'm ask to do something that I don't know how to do?" It happened more than once, and it usually resulted in a flurry of intense research to come up to speed on whatever topic was involved. I could usually do that because I have a pretty good library, and I knew how to use a university library as well. But in terms of software, I was always concerned that I had no FEA program, so how could I do problems that others were doing by FEA? I have come up with some interesting work-arounds, including writing my own FEA for some problems, but I never wanted to be dependent on software that I could not afford to own. So, back to my questions about: How are you going to buy your own copy of ANSYS? DrD
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  • DrD

    #20 -- A Question of Stability (Revised)

    By DrD

        Mechanics Corner
        A Journal of Applied Mechanics and Mathematics by DrD, #20
        © Machinery Dynamics Research, 2015
    A Question of Stability Introduction     The word stability in its several forms is widely used in nontechnical communication. A person whose life it highly consistent from day to day is said to have a stable life. When the political situation in a particular area appears to be unlikely to change, it is said to be stable. A person who is well balanced and unlikely to be easily provoked to anger is said to be a stable person. When the medical condition of a sick or injured person ceases to get worse, the person is said to be stabilized. A company on the verge of bankruptcy is said to be an unstable company. But what does the word stability mean in a technical context? Each of the foregoing examples hints at the technical meaning without really being explicit about it.   A factor g = accel of gravity was missing in the potential energy expression. That is now corrected.
        
     
        Stability.pdf
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Our community blogs

  1. Did you know that approximately 75% of the total manufacturing costs are already committed at the Conceptual Design phase? 

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    Committed Manufacturing Costs by product design stage

    This means that product design optimisation during the conceptual design phase can optimise on 75% of the committed product manufacturing costs. If you start optimising after the end of the conceptual design phase then you can only optimise on the remaining 25% of the committed product manufacturing costs. Therefore the most effective and beneficial optimisation approach starts as early as possible within the product design process.
    Being able to predict product maximum variation using minimum and maximum worse case values  within the conceptual design phase, and to identify and fine tune the main contributors, will dramatically decrease the expected product costs as well as increase the overall product quality. Knowing the main contributors to the maximum product variation will also help you to use larger tolerances for low impact contributors which will decrease the product costs even further.

    Applying optimisation at the Product Conceptual Design Phase most likely will result in the following benefits for you:

    • Acceleration of product’s time-to-market
    • Reduction of associated costs for design changes
    • Increase of product quality and robustness
    • Analysis and correction of potential failures and associated risks as early as possible
    • Identify and assess risks during conceptual product design

    All the best,
    Ralf

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    Fatigue failures occur when a structural member is subjected to fluctuating stresses or strain due to the action of repeated loading of varying or constant magnitude for a period (time). Failure of the member will occur at a stress below it tensile strength. The mechanics of the failure will depend on whether the material is considered brittle (sudden fracture) or ductile (gradual fracture).

    Engineers undertake fatigue life calculations to design against fatigue failure, although absolute fatigue life is near impossible the fatique life calculated by available methods allows for very good prediction of fatique life that enables successful engineering design.

    There are three main method used to calculate fatique life. These methods are stress life method, strain life method and crack propagation method. An engineer must determine which method is best for the particular physical problem pose to the design at hand because each method has assumptions which must truly represent the physics of the project problem. In addition, design philosophies need to be taken into account, when choosing fatigue life calculation methods

    Stress life method or S-N method is used when the cycle of the stress acting on the structure is high (HCL) > 10^3 cycles and the fatique life is required in the elastic range of the material.

    Fatigue life can vary greatly for small changes in stress or strain levels therefore fatigue life calculation requires close attention to be paid to the stress and strain calculation process and the stress and strain magnitude obtained.

    Depending on the problem and material for which fatigue life is required, physical test or finite element analysis may be performed to determine the stress and strain level of the material. FEA is a mature technology and offers many benefit to engineering process hence it is commonly used alone or combined with testing (note that testing can be an expensive venture). Testing is sometimes used to validate FEA analysis result while FEA is used to reduce testing cost.  When there is reason to believe that either the FEA is correct by analytical method or from historical test result, testing should be ignored.

    After testing or FEA has been undertaken, the fatigue life is predicted base on S-N curve of the material in the stress – life approach.

    Note that fatigue failure is affected by stress concentration, corrosion, temperature, overload, metallurgical structure, residual stress and combined stress.

  2. KINETIC ENERGY RECOVERY SYSTEM

     

     

    A kinetic energy recovery system (often known simply as KERS) is an automotive system for recovering a moving vehicle's kinetic energy under braking. The recovered energy is stored in a reservoir (for example a flywheel or high voltage batteries) for later use under acceleration. Formula One has stated that they support responsible solutions to the world's environmental challenges, and the FIA allowed the use of 60 kW (82 PS; 80 bhp) KERS in the regulations for the 2009 Formula One seasonTeams began testing systems in 2008: energy can either be stored as mechanical energy (as in a flywheel) or as electrical energy (as in a battery or supercapacitor). Kimi Räikkönen took the lead of the 2009 Belgian Grand Prix with a KERS-aided overtake and subsequently won the race. With the introduction of KERS in the 2009 season, only four teams used it at some point in the season: Ferrari, Renault, BMW and McLaren. Eventually, during the season, Renault and BMW stopped using the system. Vodafone McLaren Mercedes became the first team to win a F1 GP using a KERS equipped car when Lewis Hamilton won the Hungarian Grand Prix on July 26, 2009. Their second KERS equipped car finished fifth. At the following race, Lewis Hamilton became the first driver to take pole position with a KERS car, his team mate, Heikki Kovalainen qualifying second. This was also the first instance of an all KERS front row. On August 30, 2009, Kimi Räikkönen won the Belgian Grand Prix with his KERS equipped Ferrari. It was the first time that KERS contributed directly to a race victory, with second placed Giancarlo Fisichella claiming "Actually, I was quicker than Kimi. He only took me because of KERS at the beginning"

     

     

    for more  visit....

     

    http://www.designthedesire.blogspot.in/

     

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    Free vibrations :

     

    •  Free vibration takes place when a system oscillates under the action of forces inherent in the system itself due to initial disturbance, and when the externally applied forces are absent.
    •  The system under free vibration will vibrate at one or more of its natural frequencies, which areproperties of the dynamical system, established by its mass and stiffness distribution.

     

     

    Forced vibrations :

     

    • The vibration that takes place under the excitation of external forces is called forced vibration.
    • If excitation is harmonic, the system is forced to vibrate at excitation frequency . If the frequency of excitation coincide with one of the natural frequencies of the system, a condition of resonance is encountered and dangerously large oscillations may result, which results in failure of major structures, i.e., bridges, buildings, or airplane wings etc.
    • Thus calculation of natural frequencies is of major importance in the study of vibrations.
    • Because of friction & other resistances vibrating systems are subjected to damping to some degree due to dissipation of energy.
    • Damping has very little effect on natural frequency of the system, and hence the calculations for natural frequencies are generally made on the basis of no damping.
    • Damping is of great importance in limiting the amplitude of oscillation at resonance.
  3.  

    •  This is a concise information about a project undertaken by me when I was  doing my engineering course. Working with this project helped me a lot in shaping my career and choosing my way to the future. Hope my mechanical friends will enjoy. (More stuff willl be added based on the response from my "mechanical" viewers 

     

    India is an  agricultural economy.About  1/3 of the population heavily depends on agricultural and allied industries for their daily bread.Also it constitutes about 14 % of the nations GDP. But recently Agriculture in India is facing a decline, reason being, inefficient farming methods and labor scarcity.

    Paddy fields in Kuttanad, (Kerala) are unique because it's one of only two places in the world where agriculture is done below sea level. About 55,000 hectares, reclaimed from the surrounding backwaters for paddy cultivation along with an outer bund are made into a cluster of fields called polders.

    Broadcasting of pre-germinated seeds is the common practice of sowing where farmers walk around the field and toss the paddy seeds on to the field.

    One of the major drawbacks of this technique is that since the crop and weeds germinate together and the weeds compete with the paddy for the available water, nutrients, space and light become a biological constraint to the paddy growth. In addition, to maintain the plant population farmers go for higher seeding rates and end up using twice the amount of seeds than required. Thus there is a loss of about 30 kilograms of seeds per acre. All these result in an increased cost of cultivation. Also, by broadcasting method, proper spacing (20 centimeters side-by-side and 10 centimeters row-to-row) between the seeds cannot be obtained and this results in reduced yield.

    The rough tossing up of seeds in the Broadcasting method means that there has to be a Transplanting process, which usually takes 2-3 days and which is a very labor intensive and physically demanding process. The laborers (usually women) have to bend down to pull out the healthy saplings from the ground and then bend down again in the muddy field to replant them with the correct spacing between each paddy. Financial losses due to inefficient process, reduced yield, labor shortage etc. are discouraging people to take up farming.Thus, the agriculture industry is facing a major decline in Kerala.

    The solution is to design a sowing device suitable for the soft Kuttanadu fields, and thus a device which could be used in any part of the world, to solve the problem of labour shortages as well as inefficient farming procedures cost effectively compared to existing alternatives. Thus we came up with NIRVAPANA

    The patenting process for the project is pending and is expected to complete soon. The benefit of this idea is that now, the work done by the farmer is tremendously reduced, all he has to do is control the craft through remote and make sure that the device is moving in straight lines, and just ensuring that the farming happens in the required manner. The manufacturing is done by traditional fabrication techniques.In the future we are planning to integrate a line following robot system into our design to make this semi autonomous design completely automatic.

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    The Design and Working

    The design included two parts.

    1) The Hovercraft

    2)The Drum seeder

     A hovercraft is a vehicle that  hovers just above the ground, or over snow or water, by a cushion of air. Also known as air cushion vehicle, it is a craft capable of travelling over land, water or ice and other surfaces both at speed, and when stationary. It operates by creating a cushion of high pressure air between the hull of the vessel and the surface below. Typically this cushion is contained between a flexible skirt. Hovercrafts are hybrid vessels operated by a pilot as an aircraft rather than a captain as a marine vessel. They typically hover at heights between 200mm and 600mm above any surface and can operate at speeds above 37km per hour. They can clean gradient up to 
    20 degree. Locations which are not easily accessible by landed vehicles due to natural phenomena are best suited for hovercrafts.  

    The principle

    The hovercraft floats above the ground surface on a cushion of air supplied by  the lift fan. The air cushion makes the hovercraft essentially frictionless. Air is blown  into the skirt through a hole by the blower .The skirt inflates and the increasing air pressure acts on the base of the hull thereby pushing up (lifting) the unit. Small holes made underneath the skirt prevent it from bursting and provide the cushion of air needed. A little effort on the hovercraft propels it in  the direction of the push. 

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    As soon as the assembly floats, a blower incorporated in the thrust engine blows air backwards which provides an equal reaction that causes the vehicle to move forward. Little power is needed as the air cushion has drastically reduced friction. Steering effect is achieved by mounting rudders in the airflow from the blower or propeller. A change in direction of the rudders changes the direction of air flow thereby resulting in a change in direction of the vehicle. This is achieved by connecting wire cables and pulleys to a handle. When the handle is pushed it changes the direction of the rudders. 
     

    As discussed above,The hovercraft works on air cushion.In the present prototype, air cushion is provided through an electric blower (16000 rpm) blower which pumps air into the skirt thereby inflating the bag skirt. The air pressure thus raises the craft up above the ground. The vehicle has two engines; the rear and the front. A stator fan is attached to the front or lift engine which directs air into the skirt to provide air pressure needed to lift the craft. The propeller attached to the rear or thrust engine develops the thrust needed to propel the craft. The propeller is enclosed by  the thrust duct which makes it possible to direct the air. The duct is bell-shaped such that it 
    increases the velocity of air escaping the duct. The polyester skirt is PVC coated which gives it more strength to sustain the air pressure. It is made air tight. The hull is a platform which sustains the entire weight of the craft. A hole is made on the hull through which air enters the skirt. 
     
    After successfully fabricating the hovercraft and testing it on level grounds the next step was to incorporate a drum seeder into the system.A drum seeder is a manual sowing device consisting of a cylindrical drum attached to a central shaft having wheels attached to both sides of the shaft. It was developed with a ease the way of manual labour of sowing using traditional methods but had several demerits compared to what was trying to achieve.In this design ,the idea is to obtain the sowing with the help of rotating drums which have the required slots in the right spacing on its surface, so that the seeds will fall to the field under the force of gravity.

     For seeding by a drum seeder, the seeds are soaked in water for 24 hours followed by incubation in gunny bags and straw for 24-48 hours depending upon the weather temperature. The germination length of seeds should not be more than 1-2 mm to avoid any mechanical injury of pregerminated seeds and also to ensure free flow of seeds in the drum seeder. The pregerminated free flowing clean paddy seeds are filled upto 50 percent depth in each seed box by opening the hinge cover. Then the covers are closed

     

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    The machine is pulled by one farmer on well leveled puddled field after draining the standing water because standing water more than one cm depth disturbs the seeds sown in straight lines. The pregerminated paddy seeds are sown with the help of drum seeder  in well leveled puddled field after draining the standing water. If there is more water than 1 cm then seed will float. Therefore, if there is more standing water in the  fields it is better to leave the fields for 1-2 days for settling of puddled soil. Covering the seeds below wet soil surface is not desirable as anaerobic condition gives less germination percent. The posture required is a standing posture throughout the 
    seeding of pregerminated paddy seeds carried out in the fields.  

    Ares where improvements can be made from existing device: 

    • The seeder has to be pulled at uniform speed though the muddy paddy field to get the correct spacing, which is impossible. 
    • The seeder tends to sink in the mud when fully loaded with seeds. And pulling it through the muddy field requires a lot of energy. 
    • Footprints of  the operator (seeder) were left on the field, in which seeds could end up and result in decay. 
    • The transplanting device was heavy and will sink in the muddy field 
    • The process of transplanting was unnecessary and time consuming 

    In the paddy fields of Kuttanad, which is one of the only two places in the world where agriculture is done below sea level, the soil condition is very soft and the sinkage is very high. The farmers who do the broadcasting sowing now, when they step into the field, they sink into the mud till their knee. Moving through this soft soil is very difficult even for a single farmer, thus pulling or pushing a device through the field is even hectic and hard task. This is the reason why we thought of using a hovercraft to carry the farming mechanism over the field, so that the hovercraft can hover over the ground easily and a remote control to control the farming mechanism means that the 
    farmer does not even have to step into the field. He can just stay at the side of the field, on the boundary and control the hovercraft and the  farming mechanism through the remote.  
     
    The benefit of this hovercraft idea is that now, the work done by the farmer is tremendously reduced, all he has to do is control the craft through the remote and make sure that the device is moving in straight lines, and just ensuring that the farming happens in the required manner. This means that the energy expended by the farmer is greatly reduced and thereby the area that can be covered by the farmer in a single day is far more than that can be covered in the conventional method. This is because the farmer needs to take no or very few breaks as he is not required to do any work than controlling the device. 

    Testing and Results

    Testing was conducted by filling the seed container with half its capacity. The  device was made to move a distance of 5 meters on a level floor to simulate the seeding process. The device has to move precisely straight so that the correct spacing is achieved  between seeds. During testing, the  device tend  to move side ward (towards left). This was due to the slight inclination of the thrust fan duct, which was inclined. This inclination was removed and tested again, which gave positive results. When the seed drum was rotated by the synchronous motor, which get activated by the forward motion of the hovercraft,  seeds were discharged on to the ground with  approximately the required spacing. A uniform motion was achieved, and the sowing was able to be done in  straight line of 10 meters in less than 2 minutes.,with right spacing in between.

    A comparison of time saved; Traditional method Vs HVSD

    Conducted a survey that covered the target area. Accordingly the process of traditional farming followed here includes two steps. Firstly the process of broadcasting or sowing of pregerminated seeds which by experience will take about 24 manhours of work to cover one hectare of the field.The second step ; transplantation is done after 18- 20 days ., which takes about 320 manhours/hectare. So the complete process takes about 344 manhours/hectare. On the contrary,the final prototype is estimated to take a meagre 40 manhours/hectare to complete the same task more effectively under ideal conditions.To add, the people of the area has 24x7 access to stable power supply of 240 V.

    Will keep you updated more on the project as and when possible. Post your comments and queries below..and likes too:);) Thanks in advance for your supports.

     

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    Kindly support this initiative by voting and sharing our entry in TechBriefs.
     
    For More Infomation and to vote
     
  4. Is there any process to make helical gear by horizontal milling machine by use of involute gear cutter. I know for this process there are not such finishing but I want to do maximum possible machining by involute gear cutter. What is the setup required of dividing head spindle and any other for tapering tooth space?

  5.  

     

    Five stroke engine gives an option of a much more fuel efficient engine

    Engine capacity 700cc (turbocharged)
    Peak power 130 bhp @ 7000 rpm
    Peak torque 166 Nm @ 5000 rpm
    Fuel consumption of only 226 g/kWh

    for more info visit www.blogger.com/blogger.g?blogID=1816197738566227847#editor/target=post;postID=7749471607111123754;onPublishedMenu=allposts;onClosedMenu=allposts;postNum=0;src=postname

  6. LET US DISCUSS ABOUT THE SIMPLE DESIGN ENGINEERING USING 2D AND 3D SOFTWARE'S AND ITS ANALYSIS

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    Why are the perpetual machines not possible??????????

  7. 1-GEARTURBINE PROJECT

    Rotary-Turbo-InFlow Tech

    Atypical InFlow Thermodynamic

    Technology Proposal Submission

    Novel Fueled Motor Engine Type

    Gearturbine Imagens Gallery at Behance:

    https://www.behance.net/gallery/21019191/Novel-Rotary-Turbo-InFlow-Tech-Gearturbine-Project

    *State of the art Innovative concept Top system Higher efficient percent.*Power by bar, for Air-Planes, Sea-Boats, Land-Transport & Dynamic Power-Plant Generation.

    -Have similar system of the Aeolipile Heron Steam device from Alexandria 10-70 AD. -New Form-Function Motor-Engine Device. Next Step, Epic Design Change, Broken-Seal Revelation. -Desirable Power-Plant Innovation.

    YouTube; * Atypical New • GEARTURBINE / Retrodynamic = DextroRPM VS LevoInFlow + Ying Yang Thrust Way Type - Non Waste Looses

    -This innovative concept consists of hull and core where are held all 8 Steps of the work-flow which make the concept functional. The core has several gears and turbines which are responsible for these 8 steps (5 of them are dedicated to the turbo stages). The first step is fuel compression, followed by 2 cold turbo levels. The fourth step is where the fuel starts burning – combustion stage, which creates thrust for the next, 5th step – thrust step, which provides power to the planetary gears and turbines and moves the system. This step is followed by two hot turbo steps and the circle is enclosed by the final 8th step – bigger turbine. All this motion in a retrodynamic circumstance effect, wich is plus higher RPM speed by self motion. The Reaction at front of the action.

    *8-X/Y Thermodynamic CYCLE - Way Steps:

    1)1-Compression / bigger

    2)2-Turbo 1 cold

    3)2-Turbo 2 cold

    4)2-Combustion - circular motion flames / opposites

    5)2-Thrust - single turbo & planetary gears / ying yang

    6)2-Turbo 2 hot

    7)2-Turbo 1 hot

    8)1-Turbine / bigger

    -With Retrodynamic Dextrogiro vs Levogiro Phenomenon Effect. / Rotor-RPM VS InFlow / front to front; "Collision-Interaction Type" - inflow vs blades-gear-move. Technical unique dynamic innovative motion mode. [Retrodynamic Reaction = When the inflow have more velocity the rotor have more RPM Acceleration, with high (XY Position) Momentum] Which the internal flow (and rotor) duplicate its speed, when activated being in a rotor (and inflow) with [inverse] opposite Turns. The Reaction at front of the action. A very strong Novel torque power concept.

    -Non waste parasitic looses for; friction, cooling, lubrication & combustion.

    -Shape-Mass + Rotary-Motion = Inertia-Dynamic / Form-Function Wide [Flat] Cylindrical shape + positive dynamic rotary mass = continue Inertia positive tendency motion. Kinetic Rotating Mass. Tendency of matter to continue to move. Like a Free-Wheel.

    -Combustion 2Two continue circular [Rockets] flames. [ying yang] opposite one to the other. – With 2TWO very long distance INFLOW [inside propulsion] CONDUITS. -4 TURBOS Rotary Total Thrust-Power Regeneration Power System. -Mechanical direct 2two [small] Planetary Gears at polar position. -Like the Ying Yang Symbol/Concept.

    -The Mechanical Gear Power Thrust Point Wide out the Rotor circumference were have much more lever [HIGH Torque] POWER THRUST. -No blade erosion by sand & very low heat target signature profile. -3 points of power thrust; 1-flow way, 2-gear, 3-turbine. *Patent; Dic. 1991 IMPI Mexico #197187 All Rights Reserved. Carlos Barrera.

    —————————————

    ·2-Imploturbocompressor; One Moving Part System Excellence Design - The InFlow Interaction comes from Macro-Flow and goes to Micro-Flow by Implossion - Only One Compression Step; Inflow, Compression and outflow at one simple circular dynamic motion Concept.

    Imploturbocompressor Imagens Gallery at Behance:

    https://www.behance.net/gallery/21691891/Imploturbocompressor

    *·“Excellence in Design" because is only one moving part. Only one unique compression step. Inflow and out flow at the same one system, This invention by its nature a logic and simple conception in the dynamics flow mechanics area. The invention is a wing made of one piece in a rotating motion, contained in a pair cavity system connected by implocavity, and interacting dynamically with a flow, that passes internally "Imploded" through its simple mechanism. This flow can be gas (air) or liquid (water). And have two different applications, in two different form-function; this one can be received (using the dynamic flow passage, as a receiver). Or it can be generated (with a power plant, generating a propulsion).

    An example cut be, as a Bike needs a chain to work from motor to wheel. And for the Imploturbocompressor application, cut be as; in a circumstance at the engine, as an A-activate flow, and with a a tube flow conduit going to the wheel as a B-receiving-flow the work use.

    To see a Imploturbocompressor animation, is posible on a simple way, just to check the Hurricane Satellite view, and is the same implo inflow way nature.

    And when the flow that is received and that is intended to be used at best, must no necessarily by a exhausting or rejection gas, but must be a dynamic passing gas or liquid flow with the only intention to count it or to measure it. This could be possible at the passing and interacting period when it passes inside its simple mechanism. This can be in any point of the work flow trajectory.

    In case the flow that is received is a water falling by gravity, and a dynamo is placed on the rotary bar, the Imploturbocompressor can profit an be obtained by generating? electricity such as obtained by the pelton well, like I say before. The "Imploturbocompressor", is a good option to pump water, or a gas flow, and all kinds of pipes lines dynamic moves.

    Or only receive the air-liquid flow, in order to measure its passage with a counter placed on the bar, because when this flow passes through the simple mechanism of a rotating wing made of only one piece it interacts within the implocavities system. And this flow can be air wind, with the difference of can have an horizontal work position, and that particle technical circumstances make an easy way for urban building work new use application, and have wind flow from all the sides 180 grades view. The aforementioned information about this invention refers to technical applications, such as a dynamic flow receiver. (whether being gas or liquid).

    With the appropriate power plant and the appropriate dimensioning and number of RPM this invention is also feasible to generate an atmospheric air propulsion and the auto-propulsion of an aircraft. Being an effective and very simple system that implodes and compresses the atmospheric air permits the creation of a new concept of propulsion for aircrafts, due to its simple mechanism and innovative nature. At the place of the aircraft were the system appears and the manner how the propulsion direction can be oriented with a vectorial flow (no lobster tail) with I call "yo-yo system" (middle cut (at the shell) to move, one side loose), guided and balanced is feasible to create a new concept of TOVL-vertical take-off landing, Because the exhaust propulsion can going out radial in all the 360 vectorial positions, going out direct all the time in all the vectors direction. With his rotor cover for an better furtive fly, like going down of a bridge for example.

    Likewise, with the due form and dimensioning, and considering the liquid density and the due revolutions for this element there could be generated a propulsion (water) in order to move an aquatic ship, whether on surface or under water. Also can be a good option to pump liquid combustion for a rocket propulsion.

    Making a metaphoric comparison with the intention to expose it more clearly for a better comprehension of this innovative technical detail, it would be similar to the trajectory and motion of a dynamic flow compared with a rope (extended) that passes through the system would have now a knot (without obstructing the flow), so the complete way of the flow at the imploturbocompresor system have three direct ways and between make two different turns; direct way (entrance) - turn - direct way (implocavity) - turn - direct way (exit), all this in a 1 simple circular move system concept.

    Its prudent to mention that the curves and the inclinations of the blades of a rotating wing made of this invention, is conferred by its shape and function a structural rigidity allowing it to conduct and alter appropriately the dynamic flow passing through its system.8364

    :unsure::rolleyes::P

    Source: State of the Art - Novel InFlow Tech - Featured Project Development; 1-Gearturbine, 2-Imploturbocompressor

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    why pressure cooker cooks fast?

    The pressure of steam increases water temperature, when temperature of water is higher than its boiling point (100oC), it can help to cook faster.

    pressure inside pressure cooker is directly proportional to water temperature

    P ∝ T , as P increases T increases.

    Average pressure inside a household pressure cooker can be 15 pounds per square inch.

    Average Temperature inside will be 121oC (250oF).

    1 pound per square inch = 0.0689475729 bar

    15 pounds per square inch = 1.03421 bar

    How a pressure cooker works?

    By steam + Pressure.

    normal boiling point of water =100oC = 373k

    In pressure cooker,

    1. The water is filled less than 2-3rd of the container's capacity.

    2. Subjected to heat.

    3. Steam is produced.

    4. Enough pressure shuts safety spring loaded valve.

    5. Pressure increases and acts on ingredients inside.

    6. Pressure acts uniformly.

    7. Temperature of water raises above 110-120oC

    8. Increase in Temperature = Decrease in Cooking Time.

    9. When pressure is high, weight is lifted.

    10. Steam is sent out.

    11. Food is cooked in less time.

    Crisps:

    1679, the pressure cooker was created by Denis Papin, French Physicist and Mathematician.

    1680, He made safety valve.

  8. Is there any process to make bevel gear by horizontal milling mc to use of involute gear cutter. I know for this process there are not such finishing as formed gear cutter but I want to try maximum possible machining by involute gear cutter. What is the setup of dividing head spindle any other small setup is required for tapering tooth space?

  9. Why the gas cylinders and the deo botteles are cooler than the normal room temp?

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    Hi all ...I am looking to make a wind turbine ..This is a model of a blade pitching mechanism ...can anyone suggest how to design it ??

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    Good Day, Everyone...

    I would like to emphasize the importance of sketching your ideas. Sketches go along way in helping you pass your thoughts onto others. It does help you organize your thinking, and capture thoughts for review at a later date. Sometimes the incubation drives your design sketch in other directions.

    See attached for some more guidance.

    The Importance of sketching out your ideas.pdf

    Gerald

  10. blog-0656814001422714208.jpg

    how would to design a film fill media for a cooling tower whose following data is known uptil this moment:

    1. inlet and outlet temperatures.

    2. dry and wet bulb temperatures of area of operation.

    3. mass flow rates of air and water.

    P.S cooling tower is cross flow mechanical induced CT.

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    The robot is designed to have six degrees of freedom movement. These robots find application in manufacturing, material handling, palletizing sectors of the industry. In industries, where corrosive or biohazard materials are to handled, direct human interface is not advisable. These robots can resolve such problems. The size and capacity of the robot can be increased as per the need. Force sensors (load cells) are attached at the end effectors of the robotic arm to handle sensitive objects

     fundamentalofroboticmanipulator-130919212144-phpapp01.pptx.be7ea20c61b96d24ea525c58f69a615d

     industrialrobotsexposicion-130428163934-phpapp01.pptx.f37ca7d4bc66c2b91f6c9d2be0186000

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    guys, I am doing analysis on a cantilever rod (containing point load). The point load varies with time.

    ie, the load is applied for about 60 seconds. And then no load is applied for about 3 minutes. This cycle continues. I have to do the fatigue analysis and harmonic analysis in ANSYS. How do i do it?

    What will be the frequency range to do harmonic analysis for the above data.

  11. Hello Engineers,

    I have Planned to refresh your knowledge in selection of the commercial parts,

    Like Bearings, Ball screws, Linear Guides, servo motor, ac Motors. Hydraulic and pneumatic_ All file I will be uploaded is my personal notes,

    time to time I will upload files to avoide your confusion

    Today I would like to add file for bearing selection which is simple things some parts is written in marathi.

    you may add me in your linked to get recent updated files or may get my hepl directly into your mail box

    in.linkedin.com/in/smahesh2/

    please feel free to caoncat me for design calculation and selection process.

  12. 10 Self Improvement Activities

    These self improvement activities will help you become more productive, get into the positive state of mind and achieve better quality of life.

    In this article you will also find out how to use your energy effectively, what is the quickest way to achieve personal growth and how to excel in every activity.

    1st Self Improvement Activity: Use your energy on important things

    If you want to succeed in life, you should not waste your energy on activities that do not bring any benefits.

    Such useless activities include surfing the internet without any purpose, watching TV, worrying and wasting money.

    When you are involved in such activities, you have no or little energy left for activities that can create a better future. It is worth prioritising and accomplishing important tasks first, and then if you still have enough energy, you may decide to do the unimportant.

    2nd Self Improvement Activity: Focus on one task at a time

    If you want to get perfect results, you should only concentrate on one activity. This way all your energy will go into it and you will accomplish it perfectly.

    If you waste your energy on several things at the same time, you will get average results because you will divide your energy between the activities.

    3rd Self Improvement Activity: Control your thinking

    To avoid chaos in your mind resulting in chaos in the outside world, you should try to observe your thoughts. Once you start doing that, you will notice how many negative thoughts you get daily.

    By observing negative thinking you will be able to emotionally disengage from it. As a result, negative thinking will affect you less and you will notice that your days are getting more peaceful and positive.

    4th Self Improvement Activity: Get organised

    When you live in an organised manner, you do not suffer from stress and your life is peaceful and balanced. To start living this way, you should start planning your day in advance. This will eliminate any stress caused by being late to a meeting or forgetting to complete some task.

    You should also live in tidiness because by keeping your home clean you also keep your mental state clear and peaceful. Such mental state will benefit you in many ways, including improved memory and less negativity.

    5th Self Improvement Activity: Live in the present

    Although this self improvement activity may seem strange to you, it is a very important activity that many ignore. The majority of people do not live in the present. They either dwell on their past or daydream about the future. They seem to forget the most important time of all the present.

    You should enjoy every present moment because your current state of mind always manifests in the outside world, creating your future accordingly. Therefore if your main mood is very positive, you will experience only happy days. However, if you dwell on negative thoughts, you are sure to encounter many obstacles and misfortunes in the present and days to come.

    6th Self Improvement Activity: Complete each task in a perfect manner

    Whenever you are working on some project, try to accomplish it in the best way possible. Always ask yourself 'Is this project turned out as perfect as it could possibly be?' If the answer is no, try to correct or add something to it until there is nothing that you can improve.

    This way you will make sure that each single task you accomplish is done in an excellent manner. By doing this you will create successful future because you cannot possibly fail if you only get perfect results.

    Also, when you entirely focus on one task excluding everything else, you will notice that you start enjoying the task. If you concentrate on the task but still do not enjoy it, that means that you probably see the task as a means to an end rather than the process. You should start focusing on the process itself to find enjoyment in the task. Such enjoyment will fuel motivation and you will accomplish everything quicker and better. If you enjoy your work, you will put only positive energy into it. As a result, your completed tasks will bring you success.

    7th Self Improvement Activity: Challenge yourself

    Nothing develops you more than challenges. Challenges force you to shift your comfort zone, experience new situations and make you grow. Without challenges life would be very boring and depressing.

    Challenges are necessary for every human being who is seeking quality life. Only through trial and error you realise who you really are, which activities you like and what preferences you have. You can easily measure the success of a person by the amount of challenges s/he had.

    8th Self Improvement Activity: Read personal development books

    There is nothing more important than searching information about self improvement. Without reading any self improvement books or articles you cannot improve yourself.

    9th Self Improvement Activity: Socialize only with positive people

    Positive people can inspire, empower and make you happy. It is so much worth to be at least once in a while with positive people rather than constantly spend time with negative friends or relatives. If you spend your days with, for example, lazy people, you may notice that you are becoming lazy.

    If all your friends' main qualities are negative, try to avoid all of them. This way you will not be affected in a negative way and after some time will start attracting positive people.

    10th Self Improvement Activity: Exercise

    Daily exercise develops determination, focus and patience. It improves your health and strengthens your body. It makes you more active, positive and invincible. People who exercise every day are always perceived as strong-willed and disciplined.

    Conclusion

    These personal improvement activities are sure to put you on the track to success. I hope that you will apply the steps in this article and, as a result, will greatly improve the quality of your life.

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    Ameer Abdul Quadir
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    Can any one help me in find the vendor who can manufacture the hemisphere of 700mm dia using aluminium of 2mm thick. Please provide details if any one can do it from india

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    Can anyone Tell, cost details of "Cosserat Rod" and its vendor ?? Please reply if anybody familiar with "Cosserat Rod" !

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    Note: I enjoy blogs, and rambling on, which is the primary reason I started this blog. I will try my best to keep consistent and provide entertaining information and possibly my mishaps while I refine my engineering skills. I enjoy to build mini-robots and program micro-controllers so from time to time I will post some of my own stuff here and talk about things I either find interesting or have learned.

    The other day I came across an interesting question about wind turbines. Some wind turbines have their "wings" on a horizontal axis, but there is a vertical axis option. Why would you choose one or the other?

    Whichever Way The Wind Blows

    Well, first of all take into account the direction of the blowing wind. Before I get to poetical, usually a horizontal wind turbine needs to be twisted toward the direction of the wind whereas the vertical wind turbine is omni-directional. The horizontal option is sort of like a cantilever beam, but the vertical wind turbine is not, soooo the vertical wind turbine could possibly, conceptually, be larger. As I was staring at some wind turbines I thought about some of these things. Once again, I'm just rambling on and I really don't have much to say today. So I leave you off with that.

    Enjoy.

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