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This paper presents a phenomenon of“Pseudo-resonance”of beams androds discovered from experiments and computations,and gives the definition of“Pseudo-resonance”.The relationship of distribution between the frequency of pseu-do-resonance and that of anti-resonance is found,and an analytic solution for thetransfer function between any two points on a beam or rod is established.The law ofdistribution of the anti-resonant frequencies,as well as the relation between the fre-quency distribution and the nodes of vibration is also proposed. 相似文献
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提出一种环境激励下的模态识别方法.具体方法是通过对非平稳随机激励下的线性时不变系统的结构响应进行小波变换,对各级小波系数利用协整理论进行线性合成得到新的信号.若此信号是平稳的,则以它代替原始的结构响应,然后结合平稳随机激励下的模态识别方法--NExT方法和修正的连续最小二乘法,只通过输出信号就可以实现对非平稳随机激励下系统模态参数的识别.仿真结果表明,该方法可以极大程度上消除非平稳随机激励所引起的结构响应的非平稳性,而且具有很高的精度和稳健性. 相似文献
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In this paper,a method of multipoint pseudorandom combined excita-tion with the orthogonal reciprocal repeated sequences(ORRS)is presented on thebackground of the on-line identification of multivariate system.The capacity of therestraint to the identification error caused by the non-random D.C.drift of the mul-ti-input excitation with the ORRS in the multivariate system is also discussed.Thevalidity of the method described in this paper is proved by the modelling tests of themulti-plate rotor system. 相似文献
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Based on experimental results,this paper presents that under specificvibrational and solidifying conditions,there are several periodic layers appearing in thecrystallization of A1-3％ Mg alloy.The mechanism of the formation of periodic layer isdiscussed.Furthermore,the use of the layers to identify the solid-liquid interface and theeffect of such layers on mechanical properties of alloy have been studied. 相似文献
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