extensional vibration

The computation shows that parameters reflecting the tangential stiffness have more significant effects on torsion mode of structure than those on extensional vibration mode and flexural mode.

结果表明，描述结合面切向刚度大小的参数对结构的扭振刚度模态的影响比对纵向振动模态和弯曲模态的影响显著；

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In this paper formulas of coupling coefficients for thickness extensional and thickness shearing vibration modes along rotated axis for Lithium Niobate were obtained by Methods of matrix calculating and tensor calculating.

本文利用晶体的压电、弹性、介电矩阵，通过矩阵及张量运算，推导出铌酸锂晶体厚度模机电耦合系数的精确公式。

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In this article, form the physical principle, the model and the equivalent circuit of thickness extensional vibration mode of thin film transformer is built.

本文从基本的物理学原理入手，建立了纵纵式厚度伸缩薄膜压电变压器的物理模型以及等效电路。

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Theoretical analyses show that the longitudinal vibration of a long slender rod, the radial and thickness extensional vibration of a thin plate can be obtained from the theory in this paper. Compared with numerical methods, the method of this paper is very simple.

理论分析表明，压电陶瓷细长棒的纵向振动，薄板的径向及厚度振动等都可由本文理论导出，与数值法相比，本文理论计算简单，物理意义明显。

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Analytical Solution for Coupled Extensional-torsional Free Vibration of the Helical Spring

螺旋形弹簧拉扭耦合自由振动的解析解

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The parameters reflecting normal stiffness have more obvious effects on extensional vibration mode than those on flexural mode and torsion mode.

结合面法向刚度大小的参数对纵向振动模态的影响比对弯曲、扭振模态的影响显著；

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