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.