Internal Geneva Mechanism

Aim:-

In this Project, Creating a 3D part of Driver and Driven from scratch and will be setting up the motion analysis for an Internal Geneva Mechanism at 10rpm and 20rpm with 60 frames and 120 frames respectively. Then obtaining the plots of Contact force (between driving and the driven wheel) as a function of time, Angular Displacement of the driven wheel, and plot of the driver wheel's angular velocity.

Objectives:-

1) Use the following 2D CAD drawings to create the 3D model of the internal Geneva mechanism.

• Create 3D models for driver and driven wheels.
• Perform motion analysis by rotating the driver wheel at 10rpm.
• Obtain the following plots
  • Contact force (between driving and the driven wheel) as a function of time.
  • Angular Displacement of the driven wheel.
• Compare the contact forces with and without "Precise contact"
  • Show image for precise contact selection
  • Export the results that you get to Excel and make the plots over there

2) To navigate to the "Precise Contact" follow the steps given below

Geometry of Parts:-

1. Driver:

2. Driven:

3. Assembly:

Procedure:-

1. 3D model is developed based on given drawings
2. The parts are assembled based on the dimensions determined using the drawings.
3. The motion of the wheels is to be constrained to rotation about their axes.
4. A motor is to be defined at the axis of driving wheel at required rpm.
5. Contact has to be established between the wheels and the simulation is ready to be run.
6. After running the simulation required plots are to be extracted.
7. Precision contact available in the settings can be used to determine the contact forces more accurately.

Animation:-

• Video of Internal Geneva Mechanism At 10 rpm

Precise Contact For 10 Rpm:

Video of Internal Geneva Mechanism At 20 rpm:

• Precise Contact For 20 Rpm:

Angular Displacement Driven wheel:

Contact force at 10rpm:

Contact force at 20rpm:

Contact force 10rpm v/s 20rpm:

5. Results

• The angular displacement plots show a linear trend for the driving wheel, the driven wheel describes curves during motion along with intervals of time at rest.
• The number of peaks increased linearly with RPM as expected.
• Precision enabled study shows higher contact forces as compared to one without.
• For10 rpm, the angular velocity of the driver wheel is almost steady state with time.