How to access Hydraulic Power value from Pump block?

I am designing a wheel loader system in which I have to analyse efficiency.

My approach so far is to calculate such efficiency with the power induced by the Fixed-Displacement Pump and the power developed by the Mass.

I've found two ways to obtain my Mass Force and Speed (mechanical sensors and Probe) so I can calculate it power.

However, even though I can see my pump Hydraulic Power in the Simscape Results Explorer, I can't manage to extract it for calculations with sensors or a Probe.

I am using 2020a version.

Answer 1

[Yifeng Tang]

Hi Lucca,

The Probe right now only works with quantities that is visible in the "variables" tab of the block, so you are right you won't be able to measure that directly. I can think of two possible solutions:

1. see whether deltaP * Q gives you the right pump power. You may use a pressure sensor for the pressure increase over the pump and a flowrate sensor for Q.
2. access Simscape result AFTER the simulation using command line and plot. See this documentation page for more info: https://www.mathworks.com/help/physmod/simscape/ug/log-and-plot-simulation-data.html

Hope this helps.

[Lucca Martinelli]

Thanks!

I endup using a Rotational Power Sensor block to estimate the power input to the pump and I believe it worked out well.