Can anyone explain the major difference between sine sweep and random vibration, and how to analyze the impact on the electronic products ? Random RMS is the square root of the area under a spectral density curve. sinusoidal and random vibration, to seek relationships that could eventu- ally result in definition of a conversion factor for human performance from sinusoidal to random vibration. Best Practices for Use of Sine Vibration Testing Background of SV Testing SV testing is required by NASA-STD-7002 and most launch vehicle organizations as a final dynamic qualification of the payload to demonstrate acceptability for flight. By Harmonic response I think you are talking about a frequency response fea analysis. The article is a good place to start. However, both JPL … JPL and GSFC have both similarities and differences in their spacecraft level vibration test approach: JPL uses a random vibration input and a frequency range usually starting at 5 Hz and extending to as high as 250 Hz. Often, attempts are made to compare the peak acceleration of sine wave to the root mean square (RMS) acceleration of random vibration and shock. One in (G 2 /Hz) and other in ((m/s 2) 2 /Hz). Fast Fourier Transform (FFT) FFT Background. I do not have an electronic copy of this article, but if you would like I could scan it to a file and then e-mail it to you. GSFC uses a sine sweep vibration input and a frequency range usually starting at 5 Hz and extending only to the limits of the coupled loads analysis (typically 50 to 60 Hz). In this approach you get the response of a structure as a function of the frequency. NASA requirements differ however between the SV testing requirements provided in Air Force Standard SMC-S-016, Test Requirements for Launch, Upper-Stage … I saw a PSD signal can be expressed in 2 ways. Two sine waves are out of phase when they are not at the same points in their cycles at the same time. For simple sine waves the vibration frequency could be determined from looking at the waveform in the time domain; but as we add different frequency components and noise, we need to perform spectrum analysis to get a clearer picture of the vibration frequency. In vibration testing, the interest is not so much the phase of an individual wave, but the phase difference between a sine wave and a reference wave. These are not equivalent. Similarities in damage potential are considered in the article. Just let me know your e-mail. Several conditions were defined for which vibration could be equated on selected bases, and an interim vibration (constant period random amplitude vibration) was added between the sinus- oidal and operational vibration … Any waveform is actually just the sum of a series of simple sinusoids of different frequencies, … A good article shows how to establish a random vibration profiles from swept sine tests. (Machine Design/February 6, 1992). Sine testing in our lab is a great … Which one is practical in the feild ? I recently started working on Random Vibration. The phase difference between the two sine waves refers to the difference between the phases of the waves. However, peak sine acceleration is the maximum acceleration at one frequency. This paper is to discuss a mathematical method to compare …
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