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对水电站闸门的动态特性分析，通常采用有限元的方法。但由于该方法采用了一系列的假设与边界条件，使其结果有可能与实际情况不相符合。而模态分析技术引入了自动控制中的传递函数概念， 从输入和输出之间的函数关系入手， 找出系统的固有特性， 从而为解决实际工程问题提供了一个有力手段。通过对弧形闸门模型（２０∶１）用脉冲锤击法做模态试验， 求得该闸门的前七阶振型， 其试验分析结果与有限元理论计算结果相比， 取得了较好的一致性。该试验表明， 利用模态试验技术测取闸门的动态特性， 是解决闸门振动问题的有效途径。
Dynamic characteristics of hydropower gate, usually using finite element method. However, due to the fact that the method uses a series of assumptions and boundary conditions, the result may not accord with the actual situation. However, modal analysis technology introduces the concept of transfer function in automatic control. Starting from the functional relationship between input and output, the inherent characteristics of the system are found, which provides a powerful tool for solving practical engineering problems. Through the modal test of the radial gate model (20: 1) by pulse hammering method, the first seven modes of the gate were obtained. Compared with the finite element method, the experimental results obtained a better consistency. The test shows that the use of modal test technique to measure gate dynamic characteristics is an effective way to solve the gate vibration problem.