基于多体动力学的尾撬缓冲器动态性能研究

Research on dynamic performance of tail skid shock absorber based on multi-body dynamics

为了获得民机尾撬缓冲器吸能功量特性,提出了一套结合理论分析、协同仿真及试验验证的系统分析方法。以缓冲器理论分析模型为基础,建立了包含缓冲器动力学和液压系统的协同仿真模型;规划并实施了相应的落震仿真试验,将仿真结果与试验结果进行对比分析,验证了仿真模型的有效性和分析方法的可行性;详细讨论了不同充气压力和投放高度等关键参数对缓冲器动态性能的影响,总结了缓冲器功量、最大行程及最大轴向力随相关参数的变化规律。分析方法和结论可用于指导尾撬缓冲器的设计和选型,对民机的试飞工作具有一定的参考价值。

In order to obtain the energy absorption characteristics of tail skid shock absorber of civil aircraft,the systematic analysis method combining theoretical analysis,co-simulation and test verification was proposed.Firstly,based on the theoretical analysis model of shock absorber,a co-simulation model of shock absorberwas established,which included mechanical dynamics and hydraulic system.Then,the drop test was planned and implemented.The validity of the simulation model and the feasibility of the analysis method were verified by comparing the simulation and experimental results.Finally,the influence of key parameters such as different inflation pressure and height on the dynamic performance of the shock absorber was discussed in detail.The variation law of amount of work,maximum stroke and maximum axial force with relevant parameters were summarized.The analysis method and conclusion can be used to guide the design and selection of tail skid shock absorber,which has certain reference value for the flight test of civil aircraft.