飞机液压系统管道模态分析与实验验证

针对飞机液压系统试验台的空间管道，提出了一种分析空间管路系统三维振动特性的方法，利用锤击法沿三个方向对其进行实验模态分析，得到各个方向的固有频率，使用Pro-E软件建模，导入Ansys Workbench有限元软件中；对模型进行模态分析，得到模型的各阶固有频率及其对应的各阶振型；通过与实验模态分析结果的比较，验证了模拟计算的各阶振型的正确性，同时分清管路系统在各方向上的振动固有频率和振型，为进一步分析管路系统在外部激励下所引起的振动提供了思路。

Modal Analysis of Aerocraft Hydraulic Pipe System and its Experimental Verification

In this paper,a method is raised to analyse the 3D vibration characteristics of spatial pipe system.The hammering method is used along three directions to carry out the experimental modal analysis to attain the nature frequencies.Then,the Pro-E software is used to establish the model which can be sent to the finite element software Ansys Workbench to do modal analysis,and the nature frequencies and corresponding mode shapes are achieved.With the comparison with the result from the above experiment,it verifies the validity of the mode shapes from the calculation result.Furthermore,it can distinguish the nature frequencies and mode shapes in the three directions of the pipe system which can lend to the access of further research of the system under external excite.