通过对超声纵波声速的测量来评定船用TA2钛合金的平均晶粒尺寸。
Ultrasonic velocity measurements have been used to estimate average grain size in TA2 ship titanium alloy.
作为平均迎角趋于零的特殊情况，本文的数值结果与超声速线化的位流理论是一致的，在高超声速情况与活塞理论一致。
Numerical solutions agree with supersonic linearized potential flow theory as a special case when the mean angle of attack tends to zero and with piston theory in hypersonic case.
本文首先把能够到达接收器的那些简正波按能量相加，然后对发射深度与接收深度进行平均，导出了负声速梯度浅海中平均声强的表式。
The normal modes which can arrive at a receiver are summed according to energy, and an expression for the averaged intensity is then obtained by averaging over the source and receiver depth.
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