某飞机液压管路的流量冲击响应分析及故障诊断

Analysis and Fault Diagnosis on the Flow Impact Response of a Certain Aircraft Hydraulic Pipeline

针对某型飞机液压管路吸油模块与扩口式直角接头连接处螺纹损坏,接头脱出及支架断裂的故障问题,建立了管道有限元动力学模型,进行了管道流量冲击响应分析。发现故障管道在流量冲击下,与吸油模块连接处出现了很大的响应位移,导致管道与吸油模块连接处出现很大应力,引起连接螺纹损坏和支架断裂,从而形成故障。最后,提出了对吸油模块和支架的刚度进行强化处理的改进措施,仿真计算结果表明,在相同的流量冲击下,管道与吸油模块连接处响应位移大大降低,有效地减小了支架和吸油模块的变形和应力,实际的飞机管路系统的改进效果表明了该文分析方法的正确性。

In order to solve the problems of thread failure,joint escape and support fracture in connection of oil absorption module of hydraulic pipeline and right angle joint of flared type of aircraft,a finite element dynamic model of pipeline is established in this paper,and the impact response of pipeline flow is analyzed.It is found that there is a large response displacement at the connection with the oil absorption module under the impact of the flow rate,which leads to the great stress in the connection between the pipeline and the oil absorption module,the damage of the connection thread and the fracture of the support,resulting in the fault.Finally,the improved measures of strengthening the stiffness of the oil absorption module and the support are put forward,and the simulation results show that under the same flow impact,the response displacement of the connection between the pipeline and the oil absorption module is greatly reduced,and the deformation and stress of the support and oil absorption module are reduced effectively.The improvement effect of the actual aircraft pipeline system shows the correctness of the analysis method in this paper.