Study On The Characteristics Of Pressure Pulsation Transmission In Hydraulic Hose

Reasonable design of the hoses in the hydraulic system helps to reduce pressure pulsation in the aircraft hydraulic system.However,the unreasonable selection of hose parameters not only fails to reduce pressure pulsation,but may also increase pressure pulsation.This article conducts research on the propagation characteristics of pressure pulsation in aircraft hydraulic hoses,establishes a fluid structure coupling model for aircraft hydraulic hoses,and solves the fluid structure coupling model using the transfer matrix method.Based on the propagation characteristics of pressure pulsation to optimize the structural parameters of hydraulic hoses,and enhance the ability of aircraft hydraulic hoses to suppress pressure pulsation.(1)Fully considering the effects of Poisson coupling and friction coupling,and establishing a 14 equations model for rigid pipe fluid structure coupling.On the basis of the hard tube model,a viscoelastic Kelvin Voigt model is used to model the hydraulic hose,and a 14 equations model for fluid solid coupling of the hose is established.(2)Performing Laplace transformation on the 14 equations model of fluid solid coupling for flexible hose,and use the transfer matrix method to solve the 14 equations model in the frequency domain.Establishing the boundary constraint conditions required for the aircraft hydraulic hose 14 equation model,and providing the excitation vector under operating conditions.(3)By using relevant instruments on the experimental platform to measure the experimental data of the aircraft hydraulic system.Afterwards,Fourier transform was performed on the working condition data,and the sine function was used to fit the obvious amplitude of the feature points.Laplace transform was performed on the fitting function as input to the numerical model.By comparing the numerical calculation results with the experimental measurement results,conducted error analysis,summarized the sources of errors,and verified the accuracy of the numerical model.(4)Based on experimental conditions,a flexible hose fluid structure coupling model is used to explore the effects of fluid excitation frequency,pipeline length,pipeline wall thickness,and pipeline bending radius on fluid pressure pulsation in hydraulic hose,and to summarize the propagation law of pressure pulsation in hydraulic hose.(5)Based on the propagation law of pressure pulsation in hydraulic hose,experimental conditions and optimization methods are selected to optimize the structural parameters of hydraulic hose,and ultimately obtain the optimal structural parameters of hydraulic hose.