The deformation behavior of BMC, machining in difference cutting depth were investigated using SEMand cutting force measurement system. Then new fracture and shear band information extraction method based onindependen...The deformation behavior of BMC, machining in difference cutting depth were investigated using SEMand cutting force measurement system. Then new fracture and shear band information extraction method based onindependent component analysis （ICA） and fast Fourier transform （FFT） were used to analyze the original forcesignals. The main cutting force signals were extracted from the original signals by ICA method. The energy spec-trum of those main signals is processed by FFT. The analysis results show that the high frequency contents of cut-ting force increasing with the cutting depth. The fracture and shear band generation behavior in BMG chip resultin strong high frequency cutting force signals and the high frequency contents of cutting force increasing with thecutting depth. Besides, the frequency of Fz is 115 Hz and its amplitude also increases with the increasing ofdepth.展开更多
We proposed a method for calculating the computer generated hologram from multi-plane 3D objects by using nonuniform sampled angular spectrum method （NUASM）. Both of the holo-gram plane and the image plane are nonun...We proposed a method for calculating the computer generated hologram from multi-plane 3D objects by using nonuniform sampled angular spectrum method （NUASM）. Both of the holo-gram plane and the image plane are nonuniform sampled according to the distances and positions of the three-dimensional objects. The nonuniform fast Fourier transform （NUFFT） is used to calculate the angular spectrum propagation from the image plane to the hologram plane and the hologram can be calculated in only one step. Simulation and optical experiment results show that the hologram generated in this way can reconstruct objects on multi- planes simultaneously and separately without axial distortion.展开更多
基金supported by Hubeil Natural Science Foundation,P. R. China ( No2014CFB637)
文摘The deformation behavior of BMC, machining in difference cutting depth were investigated using SEMand cutting force measurement system. Then new fracture and shear band information extraction method based onindependent component analysis （ICA） and fast Fourier transform （FFT） were used to analyze the original forcesignals. The main cutting force signals were extracted from the original signals by ICA method. The energy spec-trum of those main signals is processed by FFT. The analysis results show that the high frequency contents of cut-ting force increasing with the cutting depth. The fracture and shear band generation behavior in BMG chip resultin strong high frequency cutting force signals and the high frequency contents of cutting force increasing with thecutting depth. Besides, the frequency of Fz is 115 Hz and its amplitude also increases with the increasing ofdepth.
文摘We proposed a method for calculating the computer generated hologram from multi-plane 3D objects by using nonuniform sampled angular spectrum method （NUASM）. Both of the holo-gram plane and the image plane are nonuniform sampled according to the distances and positions of the three-dimensional objects. The nonuniform fast Fourier transform （NUFFT） is used to calculate the angular spectrum propagation from the image plane to the hologram plane and the hologram can be calculated in only one step. Simulation and optical experiment results show that the hologram generated in this way can reconstruct objects on multi- planes simultaneously and separately without axial distortion.
