Surface acoustic wave is a elasticity wave on the solid substrate . its velocity has 105 lower than light ’ s 声表面波是在介质表面传播的弹性波,通常它具有比电磁波慢五个数量级的波速。
In this study , we applied the reversibility of elastic wave to a discussion of the reverse time propagation of wave equation 摘要本文应用波动方程式的可逆性讨论弹性波的逆时影像重建。
In this thesis , the technology of saw motor is studied on the aspects of the theories , simulations and experiments 本论文以理论分析、计算机仿真和实验相结合的方法，研究了表面弹性波马达技术。
The motion model of saw motor is set up by the formulae of hertz ' s theory and coulomb ' s friction law 以计算球体?平面挤压形变的赫兹公式和计算摩擦力的库仑定律为基础，建立了表面弹性波马达的运动模型。
Transient axisymmetric elastic waves in finite orthotropic cylindrical shells transient axisymmetric elastic waves in finite orthotropic cylindrical shells 有限长正交各向异性圆柱壳中瞬态轴对称弹性波的传播
The rf power amplifier and mechanical system of saw motor is fabricated , and a saw motor is developed successfully 完成了表面弹性波马达射频驱动电源功率放大器，机械结构的设计与制作，成功研制出一台表面弹性波马达样机。
In the test , an impact is applied on the surface of the concrete structure , and the response of the concrete due to the impact is measured and recorded 在弹性波试验中，利用钢珠或铁槌敲击混凝土表面，以产生应力波源，并以感测器测量混凝土表面反应。
The relating to methods based on the research on international and domestic electromagnetic wave ( elastic wave , acoustic wave ) for the identification of flaws are all - round viewed 本文对国际和国内基于电磁波(声波，弹性波)逆散射理论研究缺陷识别的有关方法给予了全面的评述。
All those provide reliable experience in making physics model for further studies of the relationship between cracked media and the property of elastic wavefield in it 为进一步研究裂隙与弹性波场的关系积累了制作正交各向异性介质模型材料的经验，也为定量研究正交各向异性特性提供了一种模型材料。
The transient responses of saw motor under different working conditions are simulated by the euler method , and many factor that affect the motion of the saw motor are introduced 并用euler数值计算方法对不同工作条件下的表面弹性波马达暂态响应做了仿真，揭示了各种因素对表面弹性波马达运行的影响。
