Analysis And Application Of Blasting Vibration Signal Based On Wavelet(Packet) And HHT

Signal monitoring and analysis is one of the key subjects in the field of blasting vibration. In order to solve the problems faced blasting process in a mine, based on the measured data of cutting slot blasting and ore production blasting at stope, the dissertation, applying signal analysis technology, conducted subjects related to blasting vibration signal denoising, millisecond blasting, time-delay identification, forecast for blasting vibration wave and energy security of blasting vibration.(1) The method of wavelet thresholding and EMD(empirical mode decomposition) low pass was used to blasting vibration original signal denoising, and analysis of its deficiency. An efficient method names EMD-Wavelet threshold was proposed to blasting vibration signal denoising, integrating the convenience of decomposition and reconstruction of EMD method together with the flexible and adjustable features of Wavelet threshold method.(2) Applying the philosophy of detonators detonating explosives to provoke energy density mutation, the dissertation recognized the delay time of millisecond blasting for cutting slot, informed the performance of detonator, providing a basis for blasting design in the mine.(3) Based on the technology of Wavelet packet, regressive analysis was conducted towards piecewise blasting vibration wave. Then, choose the vibration wave with site information as the basis function, construct the prediction model for full-range blasting vibration wave.(4) From the energy point of view, drawing on Physics "resonance" principle and EEMD decomposition method to study the stability of surface building under blasting vibration loading, EEMD equivalent energy evaluation model is established. And applies this model to engineering practice, it can be concluded that when equivalent energy >16, combined with measured data and the on-site damage, the ground buildings at the mine face the danger of destruction. nE...