Henry Kurniadi

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Henry Kurniadi last won the day on September 27

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  1. Want to know about Go kart Analysis

    There are: (typically) 1. dead load (structure weight, engine weight) 2. live load (driver weight) 3. wind load Load 3 will be varied according to working conditions. Some working conditions: normal conditions (max speed/rpm), extreme conditions (over-speed rpm), braking conditions.
  2. Tool-Material Interaction: Material Removal Rate

    It’s from a Manufacturing Processes book by Serope Kalpakjian. (Kinda reference for most major college in Manufacturing Processes course) your reference practically replacing my feed rate v=f*N, with object length L. Also using Davg.
  3. Tool-Material Interaction: Material Removal Rate

    Do = 100 mm d = 1 mm f = 0.1 mm/rev N = 2000 rpm v = f*N = 0.1 mm/rev * 2000 rpm = 200 mm/min d = (Do - Df)/2 => Df = 98 mm Davg = (Do + Df)/2 = 99 mm MRR = pi*Davg*d*f*N = pi * 99mm * 1mm * 200 mm/min = 62203 mm3/min = 0.0622 cm3/min
  4. Which CAD package I chose for my professional career?

    1) Never use it 2) Decent, with capability of generating 2D design, 3D design, structural simulation (add-ins), fluid simulation (add-ins) 3) Never use it 4) Use the 2D in college, never know that they could be used for simulation 5) first time heard it from you.
  5. Solidworks - Two parts joined together with table bearing

    Let say the assembly consist of A - contact area - A (one part) Bearing (one part) C - contact area - C (one part) Make two simulations... A with applied force on top; contact area as fixed support. C with applied force on contact area; bottom leg as fixed support Contact area with bearing could be made by using "split" function. Defined as "face" in drawing below.
  6. Solidworks - Two parts joined together with table bearing

    You can do either. Option 1 usually took longer simulation time and you need a good geometry for that to solve.(pic 1 and 2 of your attachment) Option 2 is preferable when you design actual component (you need to know which has which support though) (pic 3 of your attachment). Btw, in this case, Your load should be modeled on the bearing contact area, instead of the whole flat area.
  7. Solidworks - Two parts joined together with table bearing

    Typically you design bearing using calculation (i.e. 20 years life). The other two components are analyzed separately. Their contact area with bearing could be considered as fixed support. Alternatively, you could follow this tutorial. This would work on simple assembly with good geometry (on tutorial/example in books, not in real life components) Mind you, assembly simulation with "special contact" usually doesn't work in complex assembly. So the first method usually applied. The tutorial is a very conservative way to handle things. A more PC way to handle connection shown here: http://www.javelin-tech.com/blog/2015/02/solidworks-simulation-bearing-connector/
  8. Shaft typically using steel for better damping properties. Choose the easiest material to find (SS400 for East Asia, ASTM A36 for US or St.37 for Germany) For aluminum shaft, aluminum 6061-T6 works alright. Connection to rotor could be using flange (bolted) or simple welding for small shaft (with low torque). Mechanical (drum) brake is the default for most applications. A braking system called eddy-current brake would be an alternative to mechanical brake, as mechanical brake need shoes replacement. Depends on needs, a locking mechanism could also be applied. These all are based on small vertical windmills that I design/my company manufacture. You are welcome to contact me further by PM or e-mail. Please don't send ur design.
  9. Mechanical Engineering project Ideas

    HEre's throwing you a bone.... How about floating windmills. You design windmills on a floating platform, much like offshore oil platform/rig. Consideration of the ocean wave and current... also the wind conditions.
  10. Wind Tirbune Vibration Problems

    I could answer it like Miss World answering question during the pageant and end it with, "world peace" but this is a good start on "why we have vibration in any rotor" http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.567.4189&rep=rep1&type=pdf
  11. Murat, you could see how to do 1-d ansys simulation here.
  12. You need to make the rotor center of mass (actually center of rotation) also located on the geometrical center of the shaft cylinder. The art is called "balancing". Good balancing would make less vibration during operation.
  13. Designing of Mechanical components

    Any machine elements design books: i.e. Shigley, Juvinall, Khurmi, Mott, Childs, etc would be a good start. Try to understand how to design the basic machine components such as shaft, gear, pulley, bearing, bolts, brake, etc. In most cases, these books are good enough for your guide.
  14. #44 Mouse Trap / Pendulum Dynamics Challenge

    Oh, no!! My brain cells are boiling.... Maybe will try to tinker with it when I have the proper mood. But may I ask you, is this mechanism the same with trebuchet mechanism?
  15. Basic engineering help with force / lever calcs

    From Free Body Diagram: (180 lbs) (12 in) = (650 lbs/in) (delta) (X) sin(theta) X is the horizontal distance shown in picture theta is the angle (shown as 20 degrees) delta is the travel (maximum 3 inches) From that, you could get Y (shown in pic) as Y = X tan(theta) Y cannot be more than 15 inches, of course.