Patent ID: 6377900
Filing Date: 2002-04-23
Classification: G01M

Abstract:
A measuring system for measuring a transfer function matrix of a system to be controlled by applying sine-wave excitations to a test object simultaneously by multiple number of vibrators, said measuring system comprising:a sine-wave signal generating part in which when sine-wave signals for driving said multiple number of vibrators are generated, phases between said sine-wave signals are randomly shifted; at least one sensor for acquiring response signal at a response point when said multiple number of vibrators are simultaneously excited under said sine-wave signals generated in said sine-wave signal generating part; a spectrum calculating part for calculating an auto-spectrum and a cross-spectrum for one calculation from spectral data on a vibration frequency obtained from an analysis of said sine-wave signals and said response signals acquired by said sensor; a spectrum storing part in which said auto-spectrum and said cross-spectrum calculated in said spectrum calculating part are stored in sequence; an arithmetic mean processing part in which said auto-spectra and said cross-spectra for two or more calculations stored in sequence in said spectrum storing part are each arithmetically averaged to find a mean value of said auto-spectra and a mean value of said cross-spectra; a transfer function matrix calculating part in which a transfer function matrix at a specific frequency is calculated from said mean value of said auto-spectra and said mean value of said cross-spectra as found in said arithmetic mean processing part; and a transfer function matrix data storing part in which said transfer function matrix data at specific frequencies calculated in said transfer function matrix calculating part are stored in sequence, to calculate said transfer function matrix at all frequency components.