Reply To: Rotation velocity in static structural

[peteroznewman]

In one reply, you say the shaft is fixed and the wheel spins on the shaft. In another reply, you apply a torque to the wheel. To do that, the wheel could be fixed to the shaft and the engine on the other end of the shaft delivers that torque. I suppose there could be a clutch between the wheel and the shaft to disengage the wheel from the engine.

There are a limited number of answers you can get from a Static Structural analysis. The stress in a body rotating at a constant speed is one of them. In that case, the wheel is fixed to the shaft, but the rotation of the shaft should be fixed.

Transient Structural analysis is used to apply a torque to the engine-end of a shaft-wheel assembly and observe it speed up from rest over time. In that case, the wheel is fixed to the shaft and the shaft is free to rotate on its bearings. Note that you have to limit the end time of the simulation because the RPM will increase without limit the longer the torque is applied unless some viscous rotational damper is in the system to build up a large opposing torque to let the system reach equilibrium.