The vast majority of vibrations encountered in the real environment are random. By their very nature, such vibrations are complicated. This volume describes the enabling process for simplification of the analysis required and the analysis of the signal in the frequency domain. Power spectrum density is defined, with precautions needed to be taken in its calculation described together with the processes (windowing, overlapping) needed to improve results. A further, complementary method, the analysis of statistical properties of the time signal, is described. This enables determination of the distribution law of the maxima of a random gaussian signal to be determined and simplification of calculation of fatigue damage to be made by the avoidance of the direct counting of peaks.
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Christian Lalanne is an expert at the French Atomic Energy Authority, who has specialized in the study of vibration and shock for more than 30 years. The author of numerous publications in this field, he has been associated with the new methods of drafting testing specifications and associated informatic tools.
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