多质点体系：原子，耦合振子，周期晶格。
Many Particle Systems: Atoms, Coupled Oscillators, Periodic Lattice.
利用等效弹性法分析了压电矩形共振器的二维耦合振动，导出了振子共振频率的解析表达式。
Based on the equivalent elasticity method, the plane coupling vibration of a rectangular piezoelectric ceramic plate was studied and the resonant frequency equation was derived out.
第三章从一个四自由度弹簧振子的振动分析问题提出耦合单元的概念，建立了多转子系统振动分析的整体传递矩阵法；
In the third part, the concept of coupling element is derived from the vibration analysis of a four-degree spring-oscillator system, and a whole transfer matrix method is developed on the basis of it.
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