Transmission simulation solver crash
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Hi,
I have a problem with my simulation. I tried to simply add 7 speed transmission to the Vehicle with Four speed transmission model. The model works with 8 or 6 speed transmission but for 7 speed it crashes and message appears "Error:An error occurred while running the simulation and the simulation was terminated:
Rotational velocity must be less than or equal to Maximum speed.
"
回答（1 个）
AKennedy
2024-3-22
0 个投票
Hi Grzegorz,
The error "Rotational velocity must be less than or equal to Maximum speed" in your 7-speed transmission simulation suggests a component exceeds its maximum rotational speed. To resolve this:
- Ensure the 7-speed ratios are correctly setand compare them with the working 6-speed and 8-speed setups to identify any discrepancies.
- Review and adjust the maximum speed limits for all rotational components in the system to ensure they're realistic and sufficient.
- Run the simulation in stages to pinpoint when and where the speed limit is exceeded. Monitor rotational velocities closely, especially during gear shifts.
- If necessary, tweak simulation parameters such as damping, inertia, or the engine's power curve to prevent excessive speeds.
Additionally, you can also look into this example (https://www.mathworks.com/help/sdl/ug/transmission-testbed.html) of a testbed with interchangeable transmissions.
Here are links to documentations that could resolve the issue.
- 4-Speed Ravigneaux: https://www.mathworks.com/help/sdl/ref/7speedlepelletier.html
- 7-Speed Lepelletier: https://www.mathworks.com/help/sdl/ref/4speedravigneaux.html
Hope this helps!
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