Simscape: Create unidirectional Locking mechanism component

Hello,

I am using Simulink (Simscape foundation library) to simulate a physical mechanism: it's an electric motor connected to some gears, inertias, wheel&axle mechanisms, masses and hard stops. I've not been able to create a component with the simscape library, that transmits torque in one direction, but locks the mechanism in the other direction and I really need it. The company I am actually at can only afford the Simscape foundation library.

Can anybody help me with a few hints or show me a similar problem?

Best wishes,

fred

Answer 1

[Guy Rouleau]

You will not be able to implement a pure lock. Using Simscape language, you could write an ssc-file to "lock" by enabling a stiff spring damper when you want the system to be locked. I would use Hard-stop source file as a starting point.

In SimDriveline, the clutch could allow you to implement a perfect locking.

Answer 2

[fred]

Thank you for your answer.

I think I understand what you mean, but how to implement a physical model changing its layout (shaft connected& no dissipation, no connection between in and out & 100% dissipation) in an iteration?

I am quite familiar with the HardStop source file but the trouble with my desired component is that I want to affect a value to the torque output by comparing the input and output torque that are at the block's frontier:

if T_out > T_in

    T_out == -T_out (*)
    T_in == -T_in (*)

else

    T_out == T_in

(*):Sum of torques on first and second node have to be 0.