Firstly, the ray method and normal mode method are used to calculate the acoustic field in underwater with the source in the air.
首先，用射线方法和简正波方法对空气中的声源在水下产生的声场进行了分析。
Simulations show that adaptively modulated bit leaking method can reduce the jitter in pointer adjustment effectively in both the normal mode and the degraded mode of SDH network.
仿真表明，自适应调制泄漏法在网络处于劣化模式和非劣化模式时都可以有效地抑制指针调整抖动。
The nature frequency, normal mode and dynamic response of gear system are studied by theoretical modal analysis method combined with experimental modal analysis method.
采用试验模态分析和理论模态分析相结合的方法，研究了齿轮系统的固有特性和动力响应。
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