三维随行电缆简化模型有限元建模与模态实验

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将一种电梯随行电缆简化为细长钢带结构，讨论了对该结构进行模态测试的方法。通过测试水平、垂直和侧向三个方向的振动，得到平面内与平面外的模态参数。利用壳单元与梁单元建立了细长钢带结构的三维有限元模型；模态实验得到的固有频率和振型与有限元分析结果一致；根据模态参数分析了随行电缆撞击墙壁、缠绕打结的原因，并提出改善其动力学特性的方法。 A typical elevator travelling cable was simulated by a steel band which forms a loop with the fixed--fixed boundary conditions. And the modal testing method was discussed for this steel band. The three dimensional vibrations of a steel band, including the vibrations within and out of the loop plane, were measured respectively. A three dimensional element finite model of the steel band was built to predict its natural fre- quencies and the associated mode shapes. The modal testing results were consistent with FE method. The rea- sons of the tangle and hit wall of the traveling cable were analyzed. And effective measures should be taken to improve the dynamics property of the traveling cable.