弧形闸门参数振动的有限元分析

Finite element analysis of parametric vibration of radial gate

参数振动是导致弧形闸门失事的重要原因之一。为对弧形闸门参数振动问题做进一步的研究,本文以主横梁、纵梁、支臂等构件组成的空间框架为计算模型,从弹性体的扰动方程出发,结合摄动理论,用有限元法求解框架结构的动力失稳区。通过对框架的动力稳定分析来确定弧形闸门的动力不稳定区,计算中考虑弧形闸门的空间效应和阻尼对不稳定区的影响。最后,通过对某工程的计算分析,证明此方法的正确性。该方法既是对弧形闸门参数振动计算方法的改进,也为弧形闸门结构动力稳定的进一步深入研究奠定基础。

The parametric vibration is one of the important causes for the accident of radial gate. In order to make reserach on the parametric vibration of radial gate, the space frame composed of main cross beams, stringers arms and some other components is taken as the analytical model. Based on the elastomer perturbation equation and perturbation method, the dynamic instability region can be computed by the finite element method. Through dynamic instability analysis of the frame, the dynamic instability region of radial gate can be obtained, the influences of spatial effect and damp on the instability region are taken into consideration. Finally, it is shown that the method is correct by analyzing a project. The method is not only an improvement on the computation of parametric vibration of radial gate, but also presents a solid foundation for further research on the dynamic stability of radial gate structure.