By Richard H Lyon

The forces and motions inside of machines are the resource of sound and vibration produced through the desktop. This publication discusses how quite a few mechanisms reminiscent of gears, electromagnetics, movement, and combustion produce forces and motions, how the computer responds to this excitation, and the way the ensuing vibrations radiate sound. The e-book additionally discusses how those sounds and vibrations can be utilized to figure out the mechanical of the desktop, and the sign processing tools which are used

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Additional resources for Machinery Noise and Diagnostics

Example text

17. Since these waves have slightly different wavelengths, there will be some places where they are in phase and other places where they are out of phase. This leads to a modulation of the waveform as shown. " If we mathematically combine the two waves, we get cos[(/cb - Akb)x — (ω — Δω)ί] + cos[(/cb + Afcb)x - (ω + Δω)ί] = 2 cos(/cbx — œt)cos 2{Akhx — Αωή. 23) We see that the solution is a product of a wave of frequency ω and wave number feb, the individual phase wave, and a modulation term with frequency 2Δω and wave number 2Akh.

The period of vibration of the cylinder wall due to this impact oc­ curs over about 40° of engine rotation and lasts about 7 msec. As expected, the vibration begins shortly after TDC. 28. 15 kHz. We have seen previously that the spectrum of motion due to an impact is determined both by the impactor and the impacted structure. We need to determine the mechanical behavior of these two parts of the system. 28 Comparison of predicted and measured spectra of cylinder wall velocity. Note difference in number of peaks.

It is very likely that this vibration is due to a rocking motion of the piston against the cylinder wall, but the analysis presented here cannot confirm this conjecture. 3. Another is the needle bar in a sewing machine, which also has impacts associated with its operation. 32. The slider is a slot that rides on a fixed pin and is driven from an eccentric on a rotating shaft. 33. 32 Experimental arrangement for getting impact data on a crank-slider mechanism. 33 Free-body diagram of crank-slider showing force between pin slider and slot.