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Integrating pressure vs volume in terms of angle theta

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Integrating pressure vs volume in terms of angle theta

I'm trying to find the work done to compress a gas by integrating a pressure-volume graph in terms of the crank angle of a piston. When using the integral function in Mathcad, an error comes up saying that these units are not comparable for p(theta).  Any help would be appreciated.

6 REPLIES 6

Re: Integrating pressure vs volume in terms of angle theta

Looks like you must be using Prime 4.0.  Many of us can't open Prime 4.0 files.  Coudl you also attach a PDF or screen shot?

Re: Integrating pressure vs volume in terms of angle theta

You are integrating over angle, so the units of the limits should be angle. You have units of volume.

Re: Integrating pressure vs volume in terms of angle theta

Use please

www.wsp.ru

for same calculation/

One example for Mathcad 15. Works with Prime 4 too

wspg.png

Re: Integrating pressure vs volume in terms of angle theta

Hi,

You can eliminate the two Solve blocks with direct calculation if you want to streamline the sheet.

Capture.JPG

Re: Integrating pressure vs volume in terms of angle theta

better.png

Re: Integrating pressure vs volume in terms of angle theta

Another new bug here?

Pic_1.png

 P.S. @Jaime_Lee Please check it.