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《Journal of Beijing University of Aeronautics and Astronautics》 2006-11
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Application of HHT analysis in surface roughness

Li Chenggui Li Baogui Sun Dan(School of Instrument Science and Opto-electronics Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100083,China)Xiong Changyou(Changcheng Institute of Metrology & Measurement,Beijing 100095,China)  
HHT(Hilbert-Huang transform) is a new two-step time-frequency analysis method to analyze the nonlinear and non-stationary signal.The key step of this method is EMD(empirical mode decomposition) method with which any complicated data set can be decompose into a finite and often small number of IMF(intrinsic mode functions).The HHT can decomposed curve of the surface roughness into component with different frequency spectrum.Each component has its own physical meaning.So it can distribute all sorts of factor which had an influence on finished surface.As a consequence,the allsided Hilbert spectrum could be got.Based on this spectrum,it can be know how contributing factor function in workpiece process.HHT is used in the analysis of roughness,and the conclusion is helpful to machining.
【Fund】: 航空科学基金资助项目(04I44007)
【CateGory Index】: TG506
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