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《Journal of Vibration,Measurement & Diagnosis》 2003-03
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A New Unbiased Frequency Response Funcition Estimator in Experimental Modal Analysis

Hua Guangjun 1,2 Wu Yunxin 1 Wu Jiping 1 ( 1College of Mechanical and Electrical Engineering, Central South University Changsha, 410083, China) ( 2Shanghai Baosteel Equipment Surver Coporation Shanghai, 201900, China)  
Based on the analysis of some typical FRF estimators and the feature of the mean of the CSD (Cross Spectral Density) of uncorrelated signals tending to zero, a new unbiased frequency response function (FRF) estimator is proposed. The proposed method can get the unbiased FRF estimation without a third signal. It can not only decrease the complexity of the measuring system, but also reduce the testing work and the probability of producing extra errors due to excessive processing. According to the method, for the n sets of tested signals, the number of average times is n(n-1)/2 , which is (n-1)/2 times as against other methods, resulting in the improvement of the accuracy of the FRF estimation.
【Fund】: 国家自然科学基金重点资助项目 (编号 :5 9835 170 );; 国家留学回国人员基金资助项目
【CateGory Index】: TB112
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