膜片式流体滤波器结构设计与实验研究

发布时间：2018-05-23 09:45

本文选题：压力脉动 + 流体滤波器　；参考：《长沙理工大学》2012年硕士论文

【摘要】：液压系统中因压力脉动而引发的振动和噪声沿管路传播，严重影响系统工作性能，日益成为妨碍液压技术进步的重要因素之一。分析液压系统压力脉动特性，提出行之有效的脉动抑制方法，对控制液压系统压力脉动，提高系统可靠性及元件寿命，具有重要意义。本文以高压液压系统压力脉动为研究对象，围绕“压力脉动特性研究”、“流体滤波器设计与实验研究”等技术问题，主要进行如下研究： 1.运用流体网络理论，以基本管道分布参数模型为基础，分析分支管路系统及树形拓扑结构管网建模方法，采用传递矩阵建立液压管网系统传递函数数学模型。应用MATLAB软件，研究液压振动测试实验台在泵源脉动输入信号激励下的压力脉动特性，并与实验结果进行对比。 2.设计一种以结构振动方式消减压力脉动的膜片式流体滤波器。采用第四强度理论，对其主要受力部件进行应力分析。建立滤波器Pro/E三维模型，并应用ANSYS有限元分析软件，进行静力学分析。 3.依托液压振动测试实验台，完成滤波器样机性能测试。对比分析柱塞泵不同转速下系统压力脉动特性，，研究膜片式流体滤波器在终端封闭管路负载、终端封闭带并联容腔负载形式下衰减特性。 4.提出辨识膜片式流体滤波器四端网络参数的实验建模方法，建立流体滤波器传递矩阵模型。研究表明：膜片式流体滤波器能够衰减液压系统中、低频压力脉动，且单一结构振动体具有明显的频率选择性。负载形式的变化对滤波器消声性能影响不明显，证明滤波器具有一定的自适应性。本文提出的实验建模方法，避免动态流量的测量，参数辨识过程简便，精度高，在液压元件实验建模中具有推广应用价值。
[Abstract]:The vibration and noise caused by pressure pulsation in hydraulic system propagate along the pipeline, which seriously affect the working performance of the system and become one of the important factors hindering the progress of hydraulic technology. It is of great significance to analyze the pressure fluctuation characteristics of hydraulic system and to put forward an effective method to restrain the pressure pulsation in hydraulic system and to improve the system reliability and component life. In this paper, the pressure pulsation of high pressure hydraulic system is taken as the research object. The main research is as follows: "study on pressure fluctuation characteristics", "fluid filter design and experimental study" and so on. 1. Based on the basic pipeline distribution parameter model, the modeling method of branch pipeline system and tree topology pipe network is analyzed by using fluid network theory, and the transfer function mathematical model of hydraulic pipe network system is established by transfer matrix. The pressure pulsation characteristics of the hydraulic vibration test bench under the excitation of pump source pulsation input signal are studied by using MATLAB software, and the results are compared with the experimental results. 2. A diaphragm fluid filter is designed to reduce pressure pulsation by structural vibration. The fourth strength theory is used to analyze the stress of the main components. The three-dimensional model of filter Pro/E is established, and the statics analysis is carried out by using ANSYS finite element analysis software. 3. Based on the hydraulic vibration test bench, the performance test of the filter prototype is completed. By comparing and analyzing the pressure pulsation characteristics of the piston pump at different rotational speeds, the attenuation characteristics of the diaphragm fluid filter in the form of the terminal closed pipe load and the terminal closed belt parallel capacitive load are studied. 4. An experimental modeling method for identifying the four-terminal network parameters of a membrane fluid filter is presented, and a transfer matrix model of the fluid filter is established. The results show that the diaphragm fluid filter can attenuate the low frequency pressure pulsation in hydraulic system and the single structure vibrator has obvious frequency selectivity. The change of load form has no obvious influence on the noise performance of the filter, which proves that the filter has certain adaptability. The experimental modeling method proposed in this paper avoids the measurement of the dynamic flow rate, the parameter identification process is simple, the precision is high, and the method has the value of popularization and application in the hydraulic component experimental modeling.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.7

【参考文献】