What causes the pressure to be different in the shown figure when I use flow divider which must be dividing the flow equally?

Question

Immanuel 2022-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/1881272-what-causes-the-pressure-to-be-different-in-the-shown-figure-when-i-use-flow-divider-which-must-be-d

评论： Immanuel 2023-6-5

Can anyone please tell me what went wrong in this circuit? What causes the pressure to be different in the shown figure when I use flow divider which must be dividing the flow equally? I m not getting rotation in either of the hydraulic motors that I have at the right end. I tried changing flow rate & pressure gain in pumps. But I am not getting enough flow of fluid after 4/3 directional control valve. The flow rate is nealy 0 after the directional valve. I don't know why.

directional valve inputs

Flow rate received after valve

I am sure that this flow rate won 't turn any hydraulic motor. But why it happens? Need your support

Thanks

Immanuel Keba

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Answer 1

Yifeng Tang 2023-3-22

The pressure sensor is an across variable sensor and no flow will go through the block. So your motor isn't getting any fluid through it. You may take a look at this example: https://www.mathworks.com/help/releases/R2023a/simscape/ug/hydraulic-actuator-with-analog-position-controller-dashboard.html and see how the pressure sensor is set up for the hydraulic actuator.

The Simscape Onramp also talks about the two different type of sensors (through vs across variables) and how to use them in the "Exploring Results" section.