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基于LMS Virtual.Lab多体动力学仿真平台,建立了某型直升机起落架虚拟静力试验方法。基于修正的Craig-Bampton固定界面模态综合法,通过求解各构件的Craig-Bampton模态信息,建立了直升机起落架试验系统的刚柔耦合动力学模型。通过动力学仿真,分析了不同工况下监测点位移随载荷变化规律,考察了夹具柔性对仿真结果的影响。仿真结果表明:对虚拟静力试验系统中的与起落架直接连接夹具加以柔性化处理,其起落架结构的最大位移与试验结果吻合较好;夹具柔性对仿真结果有较大影响。
Based on the LMS Virtual.Lab multi-body dynamics simulation platform, a virtual static test method of a helicopter landing gear was established. Based on the modified Craig-Bampton fixed interface mode synthesis method, the rigid-flexible coupling dynamics model of helicopter landing gear test system is established by solving the Craig-Bampton modal information of each component. Through the dynamic simulation, the displacement of monitoring points under different working conditions was analyzed with the change of load, and the influence of fixture flexibility on the simulation results was investigated. The simulation results show that the maximum displacement of the landing gear structure agrees well with the experimental results when the jig attached to the landing gear is flexibly treated in the virtual static test system. The flexibility of the jig has a great influence on the simulation results.