| 1. | Mode of normal vibrations
正常振动模式
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| 2. | Analysis of the acoustic propagation properties under the sea with normal vibration method
用简正波方法分析声波在海水中的传播特性
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| 3. | The test result also displays that sometimes the normal vibration associated with squeal firstly occurs prior to the tangential vibration . the tangential vibration does not occur until the normal vibration gets stronger
试验发现，有时发射摩擦噪声的振动首先在法向出现，当这个法向振动比较强时，相同或相近频率的切向振动才发生。
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| 4. | The measured tangential force , tangential inertial force and normal vibration acceleration are decomposed using a discrete wavelet transform . the relation among these three dynamics state variables is investigated
利用小波变换技术对测量的切向力、切向惯性力和法向振动加速度进行分解，对这些动力学变量之间的相互关系进行了深层次的研究。
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