Analysis of Vibration Characteristics of Cross-Type Hydraulic Pipeline Based on Finite Element Method

Abstract

Branched hydraulic lines are prone to leakage and break under complex working conditions. The coupling vibration problem caused by the fluid pressure beat and external mechanical excitation of the pump at the junction of the branch of the cross-type hydraulic pipeline is very common. So a method combining finite element simulation and fluid-structure interaction vibration experiments is proposed for research. First, the possibility of the finite element method in solving the pipeline vibration problem is verified, and then the modal analysis and harmonious response analysis of the cross-type pipe are carried out to discuss the influence of fluid pressure and solid elastic modulus on pipeline vibration. The results show that as the fluid pressure and pipeline elastic modulus change, different modes of different orders will be affected. Under external excitation, only a portion of the order is sensitive to external excitation.

Research on vibration characteristics of rocket engine flow pipeline

“…This model contains two transport equations, namely, turbulent kinetic energy k and turbulent dissipation ε . The equations are as follows (Liu et al , 2023; Liaghat et al , 2014): where G k denotes the turbulent kinetic energy generated by the laminar velocity gradient; G b denotes the turbulent kinetic energy generated by buoyancy; Y M denotes the contribution term of the turbulent expansion in the compressible flow to the global flow to the dissipation term; C 1 , C 2 and C 3 denote constants; σ k and σ ε denote the turbulent Prandtl numbers in the k equation and ε equation, respectively; µ t denotes the turbulent viscosity; and S k and S ε denote the user-defined turbulent kinetic energy term and turbulent dissipation source term, respectively.…”

“…The results indicate that the guide vane can effectively reduce the vibration and flow-induced noise of the bend in the 90° bend, and the ideal position of the guide vane is determined. Liu et al (2023) examined the vibration of a cross-shaped branch pipe under fluid pressure fluctuation and external excitation via a single-phase fluid-solid coupling method. The results indicated that the first-, second- and fifth-order modal frequencies of the cross-shaped tube are more likely to resonate with the external pressure excitation, and the vibration direction is in the X- direction.…”