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Measurement Principles and Instruments
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2irft amplitude analyzer filter bandwidth averaging time constant clipping cps/second crest factor capability damping ratio discrete power spectrum filter type PSD follows force excitation foundation motion frequency f frequency range frequency response function gain factor given by Eq Gy(f half power point Hence illustrated in Figure inches cps input linear system mean absolute value mean square value mean value measurement uncertainty narrow bandpass filter noise bandwidth normalized standard error obtained parameter periodic signal power point bandwidth power spectral density probability density function problem random vibration RC averaging relationships relative response displacement response power spectrum rms value root mean square sample record length scan rate shown in Figure signal y(t simple idealized structure simple structure sine wave single filter type spectral density function spectral density measurement standard deviation stationary random signal structural vibration true averaging type PSD analyzer uniform power spectrum usable dynamic range variance volts cps zero