目前杆号牌大都是分段式支架,呈 L 型,长边长且占有较大的体积,每次都需要使用大量螺丝螺母来进行固定安装,大量小零 件增大了安装难度,容易造成零件遗失问题,引发安装的安全隐患,同时其形状极不便于携带。针对该情况,通过进行支架结构...目前杆号牌大都是分段式支架,呈 L 型,长边长且占有较大的体积,每次都需要使用大量螺丝螺母来进行固定安装,大量小零 件增大了安装难度,容易造成零件遗失问题,引发安装的安全隐患,同时其形状极不便于携带。针对该情况,通过进行支架结构优化以解 决这一问题。固定杆号牌的支架部分通过伸缩式设计,减小了支架的占用体积;固定角钢的支架部分通过折叠式设计,减少了零件的使用。 通过上述的结构优化使其既方便携带且简化了杆号牌支架安装流程。展开更多
Harmonic wavelets not only possess the traditional advantages of a wavelet function,they also have other merits such as clear expressions,more flexible time-frequency divisions,a simple transformation algorithm,a fine...Harmonic wavelets not only possess the traditional advantages of a wavelet function,they also have other merits such as clear expressions,more flexible time-frequency divisions,a simple transformation algorithm,a finer box-like frequency spectrum and others.Given the frequency distribution characteristics of the nondestructive testing signals from a rockbolt support system and based on the discrete harmonic wavelet transformation theory,we have effectively abstracted signals from frequency ranges concerned by removing useless high and low frequency signals from the testing signals of the rockbolt support system and obtained filtered signals with a reconstruction algorithm of harmonic wavelets.Finally,we applied the harmonic wavelet transformation in filtering analog signals and measured response signals of rockbolts.The results indicate that harmonic wavelets also have excellent filtering characteristics.展开更多
基金Financial support for this work provided by the National Basic Research Program of China (No.2007CB209400)the 111 Project of China (No.B07028)+2 种基金the Key Program of National Natural Science Foundation of China(No.50834004)the National Natural Science Foundation of China (No.50874104)the Natural Science Foundation of Jiangsu Province(No.BK2006040)
文摘Harmonic wavelets not only possess the traditional advantages of a wavelet function,they also have other merits such as clear expressions,more flexible time-frequency divisions,a simple transformation algorithm,a finer box-like frequency spectrum and others.Given the frequency distribution characteristics of the nondestructive testing signals from a rockbolt support system and based on the discrete harmonic wavelet transformation theory,we have effectively abstracted signals from frequency ranges concerned by removing useless high and low frequency signals from the testing signals of the rockbolt support system and obtained filtered signals with a reconstruction algorithm of harmonic wavelets.Finally,we applied the harmonic wavelet transformation in filtering analog signals and measured response signals of rockbolts.The results indicate that harmonic wavelets also have excellent filtering characteristics.