Design And Experimental Study For A Fluid Filter With Membrane Structure

Causing the vibration and noise that spread along the pipelines, the pressurepulsation of hydraulic system seriously affects the system performance, whichincreasingly becomes one of the important factors to hinder the progress of hydraulictechnology. Thus，to analyze the features of pressure pulsation of the hydraulic systemand put forward effective ripple suppression methods, is of great significance tocontrol the hydraulic system pressure pulsation and improve system reliability.The aim of this paper is to explore high-pressure hydraulic system pressurepulsation including the study of such technical issues as pressure pulsationcharacteristics, design and the experimental study for a fluid filter. The main studiesare as follows:1. Based on fluid network theory, this paper analyses the principle of modelingbranch pipeline system and tree-topology of complex hydraulic system by use ofdistributed parameter model of basic channels as well as the transferring matrixmethod to establish the transfer model of hydraulic system. Meanwhile this paper willstudy the pressure pulsation characteristics of hydraulic vibration test bench aftertaking the flow-pulsation of the piston pump as the input signals under the help ofMATLAB and then make a contrast with experimental results.2. A fluid filters with membrane structure is designed in this paper. Using thefourth strength theory, this paper will conduct the stress analysis of the majorcomponents. The 3D model of fluid filter is established in Pro/E software and the staticstress analysis is completed by use of the ANSYS finite element analysis software.3. An experiment on the hydraulic vibration test bench is held to find out theattenuation performance of the fluid filter. This paper will compare pressure pulsationcharacteristics and attenuation performance with different rotational speed of pistonpump and load form.4. This paper gives a new identifying method for determining the parameters ofthe fluid filter and the four-pole transfer matrix model of a fluid filter that isestablished based on the method.After the above studies, this paper comes to the conclusion that; the fluid filtercan attenuate the intermediate and low frequency pressure pulsation in the hydraulicsystem, but system pulse energy will be effectively attenuated only when the inherentresonance frequency of filter structural vibration body is approached the hydraulic system frequency. The performance of filter is not obviously variated with the form of loadchanged which shows that the filter is self-adaptive to some degree. The identifyingmethod with high precision proposed in this paper which can avoid the measurement ofdynamic flow has application value in the experimental modeling of hydrauliccomponents.