弹性波

In liquids, consists of a sequence of combined elastic deformation and compression waves that travel though the liquid.

在液体中传播时，声波由一个弹性移位和压缩波相结合的序列组成。

Chapter 2 is started from the basic theory of elastodynamics, the zero and the first order reflection and transmission coefficients of rough interface are derived in theory, and some numerical examples are given. Also dispersion characters of diffraction waves are discussed in the case of micro-rough interface in deep layers.

第二章从弹性动力学的基本理论出发，通过求解波动方程的定解问题，从理论上导出了地震波在粗糙界面上的零阶和一阶反射透射系数，并给出了数值算例；该章还讨论了深层微粗糙界面的绕射波的频散特征。

Crack ; fault ; elastodynamics ; crack front wave ; limiting rapture speed ; self-heading slip pulse

裂纹；断层；弹性动力学；裂纹前缘波；极限断裂速度；自愈合滑错脉冲

The structural flitter added to the system can reduce the coupling effect of servo system and structure mode and increase the flutter velocity.

通过数值模拟发现，伺服系统会降低原有气动弹性系统的稳定性，结构陷波器的引入可以减弱伺服系统和结构模态的耦合。

The Hankel transformation method has been used to turn the basicdisplacement equations and displacement-stress constitutive equations intoa system of first order non-homogenous ordinary differential equations inwavenumber domain,and by us of the matrix method,the transfer matrix ofthe medium layered is established.

利用Hankel变换，将轴对称静力问题的位移基本方程和位移应力本构方程转化为波数域内非齐次一阶常微分方程组，利用矩阵法，建立了介质层的传递矩阵，导出了层状弹性半空间轴对称静力问题奇异解的一般解析表达式。

The cyclical pulse load consisting of a haversine load time and a rest period is adopted to simulate the actual vehicle load, and the permanent strain model under the repeated load is derived from the rheological and viscoelastic theories.

采用半正矢波间歇荷载模拟实际轮载作用，综合运用流变学和粘弹性力学理论推导了周期性荷载作用下沥青混合料永久变形的力学模型。

Based on wave propagating in three directions of elastic foundation, vibrating displacement could be assumed to be in three forms along three directions. Hooke's law and theory of waves were adopted to deduce the formula of coupled viscous boundary. The coupled viscous boundary could be applied in finite element method.

根据波在地基的3个方向都可以进行传播的特点，假定了地基中质点沿3个方向的振动表达式，通过胡克定律和波动理论，推导了弹性地基中三维动力问题的耦合粘性边界的公式。

The interaction properties of periodic waves are found to be inelastic, Then two types limit cases are considered.

研究了这些周期波之间的相互作用，发现其相互作用是非弹性的。

The interaction properties of periodic waves are found to be inelastic .

研究了这些周期波之间的相互作用，发现其相互作用是非弹性的。

On the basis of Chen's equation of finite deformation mechanics with a dragging coordinator system,the paper studied the meaning of elastic parameters and constitutive equation in the medium equivalent to classic infinitesimal deformation mechanics that cracked,large deformation formation corresponds to and relevant features of seismic velocity.

基于陈至达的拖带坐标系的变形力学方程，研究了大变形破裂地层对应的经典无限小变形力学的等效介质弹性参数的含义、物性方程和相应的地震反射波的速度特性。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。