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You wrote: >For friction to occur two surfaces have to rub against one another. This is a destructive process leading to loss of the abrading parts. Now the trend being conservation of existing resources,it becomes difficult to envisage such energy source. However it is thermodynamically a...

I have strong frequency-periodic noise in my measurement system. Is there a indexed notch filter where frequency content is filtered at multiples of a primary mode? [e.g. 100 hz, 200h z, 300 hz,.....] I'd be interested in the math form of such a filter exists or a solution in either MathCAD...

I'm interest in any public domain research re: using friction as a heat source. Specifically the efficiency of such a process.