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Isothermal Fluids Pump/Motor Case Drain

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Philip Lane
Philip Lane on 22 Mar 2024
Answered: Yifeng Tang on 27 Mar 2024
Will there be case drain options available at some point for pump/motor models in Simscape Fluids?
The models are working well overall but there are some corner case problems that result from not having case drains. For example, when a model is static (no rotary motion) the pressure doesn't bleed off from A/B ports as it would naturally in a typical closed-circuit hydrostatic transmission. To work around this I've added very small orifice models to replicate A-to-Case and B-to-Case leakage that is typical for axial piston motors.
If another solution exists already please advise.
Thank you

Answers (1)

Yifeng Tang
Yifeng Tang on 27 Mar 2024
Hi Philip,
I feel the way you model it is very reasonable. Adding an small orifice or check valve mimics what happens in real life.
A similar modeling concept may be found in this actuator block: where the diagram shows how the leakage is implemented, and indeed it's an orifice.
The parametrization of that orifice will require some empirical data though.


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