Dynamic Analysis Of The Aircraft Hydraulic Pipes Based On Fluid-structure Interaction

Aircraft’s hydraulic systems play key roles in the safety of aircraft flight. Theliquid is flowing continually in the pipeline by the action of the pump, in which processthe fluid pulsation may cause pipe vibration and lower the pipeline transportationefficiency. More seriously, the vibration may lead to the fatigue failure of the pipe andcause serious economic loss. Because of this, the paper studies the aircraft hydraulicpipe vibration caused by fluid-structure interaction (FSI) deeply. The fluid-structurecoupling model is established and the influence factors of vibration are researched.Furthermore, the dynamic analysis of the aircraft hydraulic pipes based on FSI and theexperiment verification are carried out.Firstly, the fluid turbulent model and piping model are established respectively.The fluid structure interaction is simulated using both one-way and two-way coupledtechniques. The results indicate that it is feasible and reasonable to simulate and analyzethe hydraulic pipes using one-way coupled technique in certain condition.Secondly, the FSI vibration of a straight pipe is researched. The simulationexamples show that different pipe lengths, fluid flow speeds and fluid pressures impactthe pipeline vibration greatly. The calculated results can provide some reference fordesigners to design and modify their CAD model of hydraulic pipes.Finally, the dynamics analysis of the aircraft hydraulic pipes based on FSI iscarried out using ANSYS-Mechanical and ANSYS-CFX. The results show that theresponse coincides with the actual conditions by comparing with the experimental data.Furthermore, the fatigue analysis of the screw bolt where the maximum von Misesstress exists is done, which demonstrates the screw bolt meets the fatigue strengthcriterion.