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Mechanical Engineering

Mahmoud Qadi

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  1. In a project of gas turbine reaction the question give us that : Trailing edge at the rotor outletβ_2=155°; Leading edge angle at the distributor inlet α_0=90°; The question says it is axial turbine Is it axial or mixed axial and turbine because we didn't take radial in the course The 90 degree means what exactly What i should know from this information
  2. Yes Dr it is a college project ...i was just wanna know the plan of the question's solution but anyway i have submitted the project to the doctor ...it was having many errors but it is ok and anyway thanks for you and for all who love to help us .
  3. hey mechanical engineering people i hope i can find someone to help me in just explain the plan of how to design this project .......i just need the steps should be taken generally especially what should i suppose it and what for example is fixed and if some one will give me how the safety factor values should be i need this help as soon as possible if someone can help and thanks for all the question : A mechanical engineer has proposed the design of the power lift shown in the figure below, you are kindly asked to help in designing this lift by answering the questions (A) to (G). The lift is required to raise a maximum load of 3000 lb a distance of 7 ft in 2 min at constant speed. Other specifications of the lift are given in the figure. The speed ratios are indicated in the figure. Assume uniform operation and self-locking power screw. (A)The system has estimated efficiency of 75%, find the power of the required motor in units of hp. (B) Find the magnitude and direction of the rotational speed of shaft a when viewed from right while the lift is raising the load. (C) Due to space limitations, select a suitable V-belt drive to transmit motion between shafts a and b. Identify belt section, a reasonable central distance between the two shafts, the diameter of each pulley. Make any necessary assumption (D) Calculate the torque in shaft b. You may benefit from knowing belt tensions. (E) Find the tangential and radial components of the force between gears 2 and 3. Make any necessary assumption. (Specify central distance between shafts b and c, specify number of teeth on each gear, and identify the diametral pitch.) (F) Find an appropriate face width of gear 2; identify suitable material specifications and working conditions (use AGMA method). Make any necessary assumption. (G) Calculate the radial reactions with which bearings B and C push against the shaft b. Assume belt tensile forces vertical. You need to specify reasonable shaft length and bearing locations. (H) Consider static stress analysis of shaft b, use maximum shear stress theory to determine a suitable shaft diameter with a reasonable factor of safety; select suitable steel for the shaft material. (I ) Use the diameter found in part (H) to calculate first estimate for the fatigue factor of safety of shaft b using the Goodman method. Make any necessary assumption. (J) Select a suitable deep groove ball bearing to be located at C and D, assume uniform load, 90% reliability and desired life of 13000 hours. (K) Find an appropriate face width of the bevel gears; identify suitable material specifications and working conditions (use AGMA method). Assume 15 teeth and 20o pressure angel. Make any necessary assumptions. (L) Due to distance constraints, select a suitable sprocket-chain drive to transmit motion between shafts c and d. Make any necessary assumption. Identify chain number, length of the chain in number of pitches, number of teeth on the small and large sprockets. (M) Consider static force analysis of shaft d, calculate the bearing reactions at bearings G and H. Assume the tension in the chain is perpendicular to shaft d and parallel to shaft c. You need to specify suitable shaft length and bearing locations.
  4. Because of that unknown things im asking Wt is the transmitted load And i just want to know how to get it in this question Thanks😊
  5. How can i find the transmitted load without knowing the power Is there any way to find Wt from the AGMA equation ? Any help please ?
  6. First , thank you very much for replying and explaining As for the first step what the loads that i must find ... I have to take moment and get reactions from the wieght and wind force is there any forces should be taken here ?... Could you please explain this static part related to get the reactions in the first step ...how to use it in these problem ? The safety factor ...should i suppose a value for it from me or it must be calculated from the yield strength and stresses?
  7. Hi Mechanical Engineering people this is my first activity here ,im a student from palestine . i have a project in mechanics of materials subject...it is a project of signboard with two legs and we should design it so that it gives us good saftey factor ,not all dimensions are give some are given and other should be identified to give us a good design . i have a problem in starting this project the project mark is just 10 marks from the whole course so i think it will be simple i want just to have an idea of what things should i do, like how to start and what steps i must take ...can any one help me in that please?
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