Internal Geneva Mechanism
Aim/Objective:
- 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
- To navigate to the "Precise Contact" follow the steps given below
Theory:
The Geneva Mechanism or Maltese cross is a gear mechanism that translates a continuous rotation movement into intermittent rotary motion. The rotating drive wheel is usually equipped with a pin that reaches into a slot located in the other wheel ( driven wheel ) that advances it by one step at a time.
Applications:
1. Movie Projector and Movie Cameras
2.Banknote counting machines
3. Indexable Equipments etc..
Model Picture:
Cases:
1] Rpm of motor = 10 and without precise contact (60 Frames )
2] Rpm of motor = 10 and with precise contact (60 Frames )
3] Rpm of motor = 20 and without precise contact (120 Frames )
4] Rpm of motor = 20 and with precise contact (120 Frames )
Graphs :
PLOT 01: CONTACT FORCE WITH PRECISION (RPM = 10)
PLOT 02: CONTACT FORCE WITHOUT PRECISION (RPM = 10)
PLOT 03: ANGULAR DISPLACEMENT OF A DRIVEN WHEEL WITH PRECISION (RPM = 10)
PLOT 04: ANGULAR DISPLACEMENT OF A DRIVEN WHEEL WITHOUT PRECISION (RPM = 10)
PLOT 05: CONTACT FORCE WITH PRECISION (RPM = 20)
PLOT 06: CONTACT FORCE WITHOUT PRECISION (RPM = 20)
PLOT 07: ANGULAR DISPLACEMENT OF A DRIVEN WHEEL WITH PRECISION (RPM = 20)
PLOT 08: ANGULAR DISPLACEMENT OF A DRIVEN WHEEL WITHOUT PRECISION (RPM = 20)
PLOT 09: ANGULAR VELOCITY OF A DRIVEN WHEEL (RPM = 10)
PLOT 10: ANGULAR VELOCITY OF A DRIVEN WHEEL (RPM = 20)
Result/ Conclusion :
Angular displacement of the driven wheel remains constant as the increases but max. angular velocity of the driven wheel increases with the increase in RPM.Precise contacts was always giving analytically correct results.
Animation:
Youtube Link:
https://youtu.be/RZxS84SDa30