Boots – shoes – and leggings
Patent
1989-07-13
1991-04-30
Lall, Parshotam S.
Boots, shoes, and leggings
73663, G06F 1520
Patent
active
050124285
ABSTRACT:
A vibration control system for generating desired random vibration environment with a given reference Power Spectral Density (P.S.D.) using a vibration generator on which a test object is fixed is disclosed. A detected signal representing vibration of a test object is converted into a response spectrum by Fast Fourier Transform (FFT) and the response spectrum is compared with the reference spectrum to determine a drive spectrum. Random drive signal having the determined drive spectrum amplitude is then generated continuously, and the signal is applied to a vibration generator on which the test object is fixed. This signal must be random i.e. nonperiodic, and therefore consisting of continuous spectral components with sufficient statistical independence. Method and facility to generate above mentioned signal are the principal of the present invention.
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Papoulis; "Probability, Random Variables, and Stochastic Process"; McGraw-Hill, 1984, pp. 481-485.
"Random Vibration Test System Using Digital Equalizer" by Alfred G. Ratz; Proceedings of 1970 Annual Technical Meeting of the Institute of Environmental Sciences, Apr. 1970, pp. 75-91.
Imoto Katsushi
Ueno Kazuyoshi
IMV Corporation
Lall Parshotam S.
Ramirez Ellis B.
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