弯管转角对液压管道振动特性影响分析

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Aircraft hydraulic pipeline vibration affects aircraft conduit system service life and flight safety.The vibration is mainly composed of pump vibration,fuselage vibration,and pipeline and fluid coupling vibration.The first two can be reduced efficiently through soft connection,however,the latter needs an optimization design to avoid coupling vibration.The bending zone is a sensitive area in the coupling vibration.Here,a certain type of aircraft pipeline subjected to a high periodic pressure was analyzed with the finite element method and CFD,the elbow angle effect on the pipeline vibration characteristics under an unsteady flow was studied.The results dedicated that the amplitude and the peak-peak vibration values drop 50% and 68.29%,respectively when the elbow angle changes from 90° to 60°,so the elbow angle effect should be given more attention in future designs.飞行器液压管道的振动关系着飞行器管道系统的使用寿命及飞行安全,该振动主要由液压泵体振动、机身振动及管道与流体耦合振动三部分组成。前两种振动可以通过软管连接而得到较好的解决,最后一种振动则需要通过对管道系统进行优化设计来减弱。在管道与流体耦合振动中,管道转弯处又是耦合的敏感区域,应用有限单元法及计算流体动力学法对某型飞行器一典型的高压管段进行了数值液固耦合分析,探讨了在航空泵非定常流速下弯管转角对该管道振动特性的影响。分析结果表明,管道弯头的转角从90°降低到60°,其振动幅值降低了50,振动峰峰值降低了68.29,可见弯管转角对管道振动的影响需要在将来的设计中应给予足够的重视。