弹支航空液压管路的加速度载荷响应分析

摘要

Stress analysis under acceleration load excitation is one of the key problems in the design of aviation hydraulic pipelines.Based on the response spectral analysis method,the stress response law of aviation hydraulic pipelines under the action of acceleration load was studied.The dynamic model of a two-end-fixed hydraulic pipeline was established by using a “beam”model,and its natural frequencies were solved.Then its finite element model was established to do the modal analysis and obtain its natural frequencies.The correctness of the dynamic model and the finite element model was verified with hammer tests.The response spectral analysis of the corresponding elastically supported pipeline was performed under the acceleration load.The results showed that the maximum stress appeares at the support position of the pipeline.Moreover,the acceleration load and support stiffness were changed,the simulation results showed that the relationship between the maximum stress and the acceleration load is linear,and the relationship between the maximum stress and support stiffness is nonlinear.%承受加速度载荷激励的管路应力分析是飞机液压管路设计重点考虑的问题之一。基于响应谱分析方法，研究航空液压管路在加速度载荷作用下的应力响应规律。采用“梁”模型建立两端固支液压管路的动力学数学模型，求解其固有频率；建立其有限元模型进行模态分析，得到管路固有频率。通过锤击实验验证了动力学模型和有限元模型的准确性。以加速度为载荷，对弹支管路进行响应谱分析，发现最大应力出现在管路支承位置，在此基础上，改变管路承受的加速度载荷和支撑刚度，仿真结果表明最大应力值与加速度大小成线性关系，与支撑刚度成非线性关系。