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Research on Identification of Random Loads Acting on Linear Structure Model

Author: TangXuDong
Tutor: ZhangFang
School: Nanjing University of Aeronautics and Astronautics
Course: Mechanical Design and Theory
Keywords: Structural Dynamics Vibration load identification Random load Power spectral density Orthogonal polynomials
CLC: TP391.4
Type: Master's thesis
Year: 2005
Downloads: 174
Quote: 2
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Abstract


Dynamic load identification technology is an important technology in the engineering application , the more rapid development in recent years , and there are a lot more mature recognition method . The random load recognition technology of continuous structural systems in the frequency domain and the generalized orthogonal domain preliminary study . Firstly identify the problem of the continuous variable cross-section structural systems under a single point of random loads , deduced recognition model of the system under the multi-point distributed random loads , will be distributed random load identification problem is reduced to a series of determined solving the problem of the distribution of the statistical properties of orthogonal polynomial coefficients , in the case of limited measurement information , continuous structural system provides a feasible method of distribution of the random load identification . The method requires access to adequate measurement point dynamic response information , according to the orthogonal polynomial coefficients calculated to identify a series of uncertainty distribution characteristic , thus fitting the distribution of random load distribution on the space - time . In addition, the identification method no special requirements on the dynamic response of the location of the measurement points , noise pollution measurement data , the method can also be effective recognition of the random loads , certain anti-interference ability . Through computer simulation examples and experiments demonstrate the practicality and feasibility of the identification method on the correctness of the theoretical and engineering .

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