Applying classical wave theory, a concept of equivalent elastic modulus on propagation speed modification of guided wave through "variable cross-section" of metal bar embeded layer was put forward.
运用波动的经典理论，提出了导波在金属杆嵌入层“变截面”传播时波速改变的“等效弹性模量”的概念。
Based on the stress wave theory, stress wave model of lead screw cold roll-beating is built, stress wave transfer rule is obtained and the speed of stress wave is calculated.
以应力波理论为基础，建立了丝杠冷滚打的应力波模型，获得了滚打过程中应力波的传播规律及传播速度。
In addition, with the appearance of large-capacity and high-speed computer, it is feasible that time domain theory is applied for numerical simulation of ship motions and wave loads.
另外，随着大容量和高速度计算机的出现，对于时域耐波性理论研究有了数值计算实现的条件。
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