波的传播

elastic wave, damaged media, amplitude of waves, Legendre polynomial

对于波在非均匀损伤介质中的传播问题，由于物理上的非均匀性，在数学上表现为控制方程为高

Sound is a mechanical disturbance of a wave nature that propagates through any elastic medium at a speed characteristic of that medium.

声音是一种自然波的机械振动，通过弹性介质传播，速度取决于由该介质的特性。

Transmission of stress wave through the mechanical impact system is studied with the aim to provide an approach to synthesize all parts with the same wave transmissivity as a given part.

研究了应力波在冲击机械系统中的传播规律，提出了给定部件等透射率的部件综合方法。

Based on the theory of elastic wave in anisotropy medium, the characteristic of the seismic wave is analyzed in this paper.

从各向异性介质的弹性波理论出发，本文系统地分析了各向异性土介质中地震波的传播特性。

Through observation with two homogeneous anisotropic samples, we uncover some propagation characteristics of the torsion wave in anisotropic medium.

通过两块均匀的各向异性样品，用实验观测揭示了各向异性介质中扭转波的一些传播特征。

A computational aeroacoustics approach is applied to studying sound propagation in subsonic and supersonic nozzle.

采用计算气动声学方法研究了管道近音速区的声传播和声波与激波的相互作用问题。

The propagation of stress waves in solids can be considered as a part of the field of acoustics or ultrasonics depending on the conditions.

应力波在固体中的传播，根据其条件可视为声场或超声场的一部分。

It is pointed out that the essence of this new thinking is antithesis of water hammer and its control.

针对水击压力波的产生及传播特性，指出该技术方案的本质是水击反问题及水击控制。

Propaga-tion of interlaminar delaminations is caused by flexion waves created at the contact between the projectile and thetarget.

中间层分层的传播则由弹丸与靶接触时引起的弯曲波所致。

Based on the spreading mechanism of seismic wave, introduced the locating method and software of microseismic monitoring. The main parameter was arrival time of P wave. The software was written by Matlab.

基于地震波在连续介质中的传播机理，采用P波到达时间为主要指标，编制了基于Matlab语言的定位软件。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。