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Synopsis This volume deals with practical problems encountered in vibration analysis, including nonlinear vibrations, rotor vibration and the torsional vibration of engines. Buy New Learn more about this copy. About AbeBooks.
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The vibration amplitudes at particular frequencies are indicative of the severity of the defects. Phase can be measured in many ways, and some are discussed below. Another convention to consider is that motion towards the bottom of a velocity transducer will generate a positive output signal. Investigating the FFT amplitude and phase is a better technique. Thus, reading this raw data on an oscilloscope or on modern analyzers, the cycles over a period of time T can be counted to estimate the frequency that will be obtained. In most of the cases, the time waveform is quite complex and it is almost impossible to count cycles to determine frequency content.