Random Vibration is a varying waveform. Random vibration is also more realistic than sinusoidal vibration testing because random simultaneously includes all the forcing frequencies and “simultaneously excites all our product’s resonances.” ¹ Under a sinusoidal test, a particular resonance frequency might be found for one part of the device under test and at a different frequency, another part of the DUT may resonate. Eq. A random vibration analysis provides the likely structural response to a spectrum of random excitations. Sine and random vibration testing cannot be equated. To avoid this problem, the following two approximate methods are applied: 1. (2.29) is not mathematically valid in the case of non-uniform flow because the power spectral density (PSD) of the excitation force, S F ω)(=2G(ω)) depends on the axial location along the tube. It does not refer to the physical quantity power such as watts or horsepower. It’s intensity is defined using a Power Spectral Density (PSD) spectrum. Chung YT, Krebs DJ, Peebles JH (2001) Estimation of payload random vibration loads for proper structure design. Wijker JJ (2008) Spacecraft structures. Back to: Random Testing In vibration analysis, the PSD stands for the Power Spectral Density of a signal.Each word is chosen to represent an essential component of the PSD. 2. Wirsching PH, Paez TL, Ortiz H (1995) Random vibrations, theory and practice. Random vibration. These pages were created to assist you when doing random vibration analysis. 3. Springer, Berlin. Wiley, New York. ISBN 978-3-540-755524 Google Scholar. Consider Tustin’s description of random vibration: “I’ve heard people describe a continuous spectrum (random vibration, VRC), say 10-2000 Hz as ‘1990 sine waves 1 Hz apart.’ No. Power refers to the fact that the magnitude of the PSD is the mean-square value of the signal being analyzed. Also phase changes occur over time with random vibration. 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