起落架摆振多体动力学建模及其在摆振飞行试验中的应用
Multi-body Dynamics Modeling of Landing Gear Shimmy and Application in Shimmy Flight Test based on Model

基于LMS Virtual.Lab Motion平台建立了前起落架摆振刚体动力学模型，并利用落震试验进行初步校核；其次在PATRAN中对起落架关键部件进行柔性化处理，建立前起落架摆振多体动力学模型；然后进行摆振工况仿真，识别出工作模态，并从时域和频域两个角度与飞行试验结果反复对比，不断修改更新模型，完成模型标定；最后用模型扩展试验包线，验证了起落架在整个包线范围内的稳定性。
Rigid body dynamics model of landing gear shimmy is first built in LMS Virtual. Lab Motion platform, and this model is preliminary checked through the drop test. Secondly, key parts of landing gear are processed again into flexible parts in finite element software PATRAN, so the multi-body dynamics model of landing gear shimmy is built. Then shimmy work condition simulation is conducted, the working modal is identified, and modal result is repeatedly compared with flight test result in time-frequency domain, the model is modified and updated continually, finally the model correlation work is finished. At last, test envelope is expanded by initial model, the stability of landing gears in the whole envelope is validated, and shimmy flight test state points are optimized