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sum several sin

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Hi All,

 

I have a problem. Here I discribe the case.

A triplex plunger pump will produce water hammer. This will create a sinus wave, by opening the inletvalve and closing the inletvalve. I have 3 plunjers so 6 vibration sinus.

I like to sum these sinus. See my enclosed worksheet.

 

by calculating with my hand calculator I get an answer. In mathcad I get only 'zero' (0). What do I wrong.


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