supply variable efficiency map to a hydraulic pump

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Vivek
Vivek 2015-2-27
回答： Yifeng Tang 2022-6-16
Hi All,
How can I input an efficiency map instead of a fixed value parameter for the fixed-displacement hydraulic pump model in simhydraulics?
Any ideas?

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回答（1 个）

Yifeng Tang
Yifeng Tang 2022-6-16
In newer versions of Simscape Fluids, the fixed-displacement pumps allow lookup tables as inputs to specify the efficiency as a function of pressure gain and rpm.
https://www.mathworks.com/help/physmod/hydro/ref/fixeddisplacementpump.html
https://www.mathworks.com/help/physmod/hydro/ref/fixeddisplacementpumpil.html
If those are not available to you, the way to implement this manually is via lookup table outside ideal source blocks. A diagram like below can be a starting point. It only cover the volumetric efficiency part and requires RPM as a signal input.
If you want to couple it with the mechanical domain, as in the fixed-displacement pump block, you may add a torque source and a velocity sensor for that purposes. The input to the torque source will be calculated from the delta_P and mechanical efficiency lookup table. The output from the velocity sensor will be sent to the "pump".

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