频散现象 meaning in English
spectral dispersion phenomenon
Examples
- When the source frequency increases , the dispersion and the attenuation of signals become great , but the resolution is better
当声源主频增大时，波形频散现象较严重，幅度衰减较大，但探测能力增强。 - Firstly , the multiple modes and dispersion nature of ultrasonic lamb wave are investigated in theory . furthermore , optimization of excitation signal is performed experimentally with the four parameters : the transport mode , the center frequency , the amplitude and the number of the wave ’ s peak value
本文首先从理论上分析lamb波的多模式和频散现象,在理论基础上结合实验在传播模式、中心频率、信号幅值、波峰数等几个方面对lamb波进行优化。 - It shows that when wave propagates along axis direction , the displacements of radial , axis direction and the change of electric field are coupling each other , and there is dispersing phenomenon , and the displacement of circle direction can figure out independently , it has not dispersing phenomenon
发现当波沿着圆柱壳体轴向传播时，物质的径向运动轴向运动和电势的变化相互耦合，伴有频散现象但是扭转运动可以独立表示，并且同电场无关，无频散现象。 - Finally , some important conclusions were drawn , that is , using distributed pzt transducers , ultrasonic guided waves are generated and received in a pipe . usually , there are many different modes of guided wave propagating in the pipe and these modes are generally dispersive , the specific exciting signal of a harming windowed toneburst with a central frequency of 70khz for decreasing the effect of dispersion was selected . and guided wave are generated using 16 distributed pzt transducers in a circumferential direction for suppressing flexural modes
首先，对当前本课题研究领域的进展作出综述，并简要介绍与超声导波技术相关的理论基础；其次，建立了一套有效的实验装置，在此实验装置基础上，重点研究了采用分布式pzt传感器在管中激励和接收特定模态超声导波的方法：根据在管状波导中传播的超声波具有频散现象及多模态特征，选择具有单一频率的特定信号激励超声导波，使其频散最小；同时采用分布式传感器抑制不同模态的波型。