Experimental and Numerical Vibration Analysis of Hydraulic Pipeline System under Multiexcitations

Abstract

Pipeline systems in aircraft are subjected to both hydraulic pump pressure fluctuations and base excitation from the engine. This can cause fatigue failures due to excessive vibrations. Therefore, it is essential to investigate the vibration behavior of the pipeline system under multiexcitations. In this paper, experiments have been conducted to describe the hydraulic pipeline systems, in which fluid pressure excitation in pipeline is driven by the throttle valve, and the base excitation is produced by the shaker driven by a vibration controller. An improved model which includes fluid motion and base excitation is proposed. A numerical MOC-FEM approach which combined the coupling method of characteristics (MOC) and finite element method (FEM) is proposed to solve the equations. The results show that the current MOC-FEM method could predict the vibration characteristics of the pipeline with sufficient accuracy. Moreover, the pipeline under multiexcitations could produce an interesting beat phenomenon, and this dangerous phenomenon is investigated for its consequences from engineering point of view.

Study of the inhibitory effect of a soft cushion on the propagation of pressure pulsation in pumped storage power stations

“…Several studies are focused on the vibration sources and transmission paths of pumped storage power stations in the context of water conservation and the hydropower industry [4][5][6][7] . Regional environmental vibrations and noise in the diversion pipeline of pumped storage power stations are new problems, with a paucity of research, technical know-how, design specifications, and regional vibration control standards [8][9][10][11] available to address them.…”

A Case Study of a Hydraulic Servo Drive Flexibly Connected to a Boom Manipulator Excited by the Cyclic Impact Force Generated by a Hydraulic Rock Breaker

“…Hydraulic vibration generators that implement periodic variable motion are used not only in test stands (e.g., vehicle body testbed, pulse apparatus) but also in technological machines, mining machines, and agricultural and construction equipment. Gao et al presented experiments have been carried out to describe hydraulic pipeline systems, in which the excitation of fluid pressure in a pipeline is driven by the throttle valve, and the base excitation is produced by a shaker driven by a vibration controller [20].…”

Dynamic characteristics analysis of complex aircraft pipeline system using MDSMA algorithm

“…Some researches (Hu and Zhu, 2018;Zhang et al, 2018;Zhu et al, 2019) conducted on the 3D vibration of complex fluid-conveying pipelines involving both the shear deformation and coupling effects. To solve these problems, some numerical methods and semi-analytical methods were gradually proposed, such as finite element method (FEM) (Zhang et al, 2001), dynamic stiffness matrix method (Li et al, 2011), transfer matrix method (Dai et al, 2012), spectral element method (Lee and Oh, 2003;Lee and Park, 2006), coupling method of characteristics (MOC) and FEM (Gao et al, 2020), etc. However, the above research objects were someone specified pipeline, and if the traditional FEM is adopted, the amounts of elements and the FSI calculations was huge.…”

“…, 2011), transfer matrix method (Dai et al. , 2012), spectral element method (Lee and Oh, 2003; Lee and Park, 2006), coupling method of characteristics (MOC) and FEM (Gao et al. , 2020), etc.…”