Aircraft pipeline vibration is an important fault that seriously threatens flight safety. It is of great significance to reduce the vibration level of aircraft pipeline and improve the reliability and safety of aircraft. Aiming at the vibration reduction of aircraft pipeline structure which is difficult to be constrained by pipe clamps, a pipeline vibration absorber based on particle impact damping technique is designed. Through ingenious structural deign, the vibration absorber is conveniently clamped to the existing pipeline without affecting the existing pipeline structure. Based on the energy dissipation caused by the particle collision inside the damper, the damping effect of the pipeline structure is improved. Therefore, if the particle impact damper is installed on the vibrating pipe, the peak vibration of the pipeline will be significantly reduced when the pipeline resonates. In this paper, the influence of the particle filling ratio on damping effect is studied by shaking table test, and it is found that the vibration of the pipeline tends to decrease first and then increase with the increase of particle filling ratio. At the same time, using EDEM particle flow simulation software, the energy dissipation of particles in vibration process of absorber is calculated. It is found that the particle filling rate corresponding to the maximum particle energy dissipation rate is in agreement with the particle filling rate when the vibration acceleration of the pipeline decreases to the lowest, and the simulation results are in good agreement with the test results. Finally, the designed particle damper is installed on the hydraulic power supply pipeline for actual tests of vibration absorption. The vibration acceleration of the test pipe in three directions X,Y,Z before and after the installation of the damper is tested, and the results are compared and analyzed. It is found that the vibration level of hydraulic pipeline under pressure pulsation frequency is significantly restrained after the installation of particle damper. The experimental results fully suggest the effectiveness and practicability of the aircraft pipeline particle damper designed in this paper.
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