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 Wysłany: Sob 22:48, 07 Maj 2011 Temat postu: gorras ed hardy Half-power point method to estimat |
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Half-power point of an improved method to estimate the damping
T's line is just a sample of its spaced. Understanding based on this continuity, half-power point estimates constructed a new algorithm for damping. Simulation results show that the algorithm can effectively improve the damping estimation accuracy. Theoretical analysis and numerical simulation using the combination method to study the half-power point method, the main error factors and their respective characteristics. For small damping system, damping is the window of estimation accuracy of the critical damping factor, it is roughly inversely proportional with the window length, and gives a guarantee 1O, 5 and 1 the length of selected sampling error formula. References 1 Xu article, Qun-Ying Jiao. Mechanical vibration and modal analysis basis. Beijing: Mechanical Industry Press, 1998; 36-382CooleyJW, TukeyJW. AnalgorithmforthemachinecomputationofcomplexFourierseries. Mathematicsofcomputation, 1965; 19:297-3O13 Hu Guang book. A digital signal processing theory, algorithms and implementation. Beijing: Tsinghua University Press ,1997:153 -1564 Liu Jinming. Should Huaiqiao. FFT spectral analysis of continuous refinement of the Fourier transform method. Vibration Engineering, 1995; 8 (2) :162 -1665 Li Zhi-hua. Real Fast Fourier Transform operation. Tsinghua University,imagenes ed hardy, 1981; 21 (4) :45-616 Cheng Peiqing. Digital signal processing tutorial. Beijing: Tsinghua University Press ,1995:215-2527 Lifang Ze, Liu Fu-Qing, Wang Zheng. Vibration Measurement and Analysis Project. Beijing: Higher Education Press ,1992:293-3008 CHEN Kui-fu, Zhang Sen Wen, GAO Xiao Rong. Symmetric window function of the amplitude spectrum characteristics. Agricultural Engineering,Tory Burch shoes, 1999; 15 (1) :36-4O9 Kui Fu Chen,gorras ed hardy, Qun-Ying Jiao, upper primary fig. FFT spectrum to improve the quality of a new method. Vibration, testing, and diagnosis, 1998 (3) :216-22O1O Kui Fu Chen, Qun-Ying Jiao, upper primary fig. Periodic signal parameter estimation accuracy. Mechanical strength. 1999; 21 (3) :174 -17,711 Chen Kui-fu, GAO Xiao-Rong. Peak selection method of the window function. China Agricultural University, l997; 2 (4): 21m2712 Ding Kang, Zhang Xiaofei. Spectrum correction theory development. Vibration Engineering, 2000; 13 (1): 14m23ImprovementontheDampingEstimationbyHalfPowerPointMethodChenKuifu (EastCampus, ChinaAgriculturalUniversityBeijing,ed hardy bikinit, 100083) ZhangSenwen (TheInstituteofAppliedMechanics, JinanUniversityGuangzhou, 510632) AbstractToguaranteetheprecisionofdampingestimatedbythemethodofhalfpowerpoints, thetransformdefinitionbetweenthediscretespectrumlineoffastFouriertransform (FFT) isexplored. Baseonthecontinoustransformdefinition, anewestimationmethodisproposed, themainerrorfactorinvolvedinthemethodisstudiedwiththeoreticalanalysisandnumericalsimulation. Themostimportantfactorintheestimationiswindowdamping, whichrelatestOthesamplesize. Keywords: damping; frequencyresponsefunction; fastFouriertransform (FFT) the first of the male Fu Kui Chen, Ph.D.,abercrombie outlet, lecturer in December 1969 students. E-mail; chenkuifu @ hotmail. com
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