propagation direction meaning in English

传播方向

Based on the relationship between elastic constants and sound velocities in composite material and measuring very few velocities of different propagation direction , the elastic constant matrix can be calculated out
依据复合材料中声波速度与材料弹性常数之间的本构关系，测量不同传播方向的少数几个声速，就可以得到其弹性常数矩阵。
By using bpm , the problem is reduced from a second - order boundary value problem requiring iteration or eigenvalue analysis to a first - order initial - value problem that can be solved by simple " integration " along the propagation direction
和其他模拟方法相比， bpm将二阶边值问题简化为一阶初值问题，减小了计算的复杂性，缩短了计算时间，降低了对计算机硬件的要求。
When pure shear wave propagate in anisotropy media , even thought propagation direction is parallel to the direction of aligned cracks , experimental results exhibit that only two kinds of shear - wave velocity can be measured - fast shear wave and slow shear wave neglecting polarization direction
这个实验结果进一步表明，纯横波在各向异性介质传播时，即横波的传播方向与裂隙平行，无论横波的偏振怎样改变，只能观测到两种横波速度，快横波和慢横波。