Research On Damping Vibration Characteristics Of Metal Rubber And Its Application In Engine Pipelines

The aircraft engine has a complex piping system so that it can transport all kinds of media,which makes a key guarantee for reliable engine operation.However,the faults resulting from vibration of the pipeline in the engine are appalling and need to be solved urgently.Metal rubber is a new kind of damping material with a strong tolerance to harsh environment,which makes the application in vibration isolation system of the aircraft engine comes possible.This paper focuses on the research of metal rubber.The research on the performance of engine pipelines supported by metal rubber has been carried out,which could improve the vibration performance of engine pipelines and provide data reference for the design and application of metal rubber.Through the observation of the metal rubber manufacturing process,the concept of storey number was introduced as a major variable for follow-up studies according to the laying process of metal rubber.The block metal rubber was made for the tensile and compression research.And the results showed the influence of different parameters on the stiffness and energy dissipation coefficient of metal rubber.The performance of the metal rubber is verified by the sweep frequency and residence test.On the basis of the test,the parameters of metal rubber lining felt are determined.The influence of initial deformation of metal rubber on axial compression force of pipeline was analyzed.After this the internal stress of metal rubber after deformation was simulated by ANSYS.The influence of different parameters on the pull-out force in the engine pipe with the lining clamping by metal rubber has been analyzed,and the relationship between the pull-out force and the parameters of metal rubber was obtained.On the basis of the small curvature model,the relationship between the stiffness,the energy dissipation coefficient and the number of storeys of the metal rubber was deduced,thus the expression of equivalent damping coefficient of metal rubber was given.The vibration test of the metal rubber supported pipeline was designed,and the vibration isolation performance of hysteretic damping support structures was theoretically predicted.The insertion loss and the natural frequency were used as the evaluation indexes for the vibration isolation of the pipeline.And the influence of the metal rubber with different parameters on the vibration performance of pipeline was analyzed to obtain the relation between the insertion loss coefficient and the multiple parameters of the metal rubber.The vibration of the metal pipe in engine was deduced by the transfer matrix method,so that the expression of natural frequency of the metal pipe for bending vibration could be obtained.ANSYS was used to analyze the vibration of the pipeline.And the accuracy of stiffness prediction of metal rubber has been proved by the comparison of the modal analysis and the experimental data.Based on this,the internal stress in the pipeline under vibration was simulated and analyzed.The fitted function was used to optimize the performance,the manufacturing and installation of the metal rubber felt based on the quasi discrete method.