柔性膜片式流体滤波器的研究

发布时间：2018-04-30 14:59

本文选题：液压系统 + 压力脉动　；参考：《长沙理工大学》2012年硕士论文

【摘要】：在液压系统中，由于液压泵是利用容积变化、交替地排出液压油来工作的，其输出的瞬时流量是具有周期性的脉动流量。当这一脉动流量遇到系统阻抗后就产生了周期性的压力脉动，并沿管路传播，产生振动和噪声。抑制液压系统的压力脉动对提高系统的可靠性和工作质量，对提高液压元件的寿命，降低系统的噪声都有重要的意义。液压系统的流体脉动控制一直是一个没有得到很好解决的技术难题。在液压系统中安装滤波器对流体脉动的衰减能起到很好的效果。本文提出了一种结构简单、灵巧的机械谐振机构，膜片振动式流体滤波器。具体研究内容包括： 1．提出一种膜片振动式流体滤波器结构。分析了液压系统压力脉动特性；基于动力吸振器的作用机理，设计一种结构简单、灵巧的机械谐振机构。对滤波器的结构进行初步设计。 2．建立了预拉伸柔性膜片振动的数学模型，并求解了柔性膜的固有频率。使用超弹性膜理论求解了预拉伸柔性膜片的固有频率；利用有限元分析软件ADINA，对预拉伸柔性膜片模型进行流固耦合模态分析，研究柔性膜片的流固耦合动态特性，为滤波器的设计提供依据。 3．使用计算流体力学方法对该流体滤波器的衰减特性进行仿真分析。通过对滤波器模型进行简化，并设置相关仿真参数，对模型进行瞬态动力学分析。研究滤波器频率特性和衰减特性。 4．通过实验测试膜片式流体滤波器的衰减特性。建立了液压振动试验台，研制了膜片式滤波器实验样机，，对滤波器的衰减特性进行实验。并与仿真结果进行对比分析，说明仿真分析的正确性。
[Abstract]:In the hydraulic system, because the hydraulic pump uses the volume change, the hydraulic oil is discharged alternately to work, the instantaneous flow rate of its output is periodic pulsating flow rate. When this pulsating flow rate meets the impedance of the system, it produces periodic pressure pulsation, which propagates along the pipeline, resulting in vibration and noise. It is very important to restrain the pressure pulsation of hydraulic system to improve the reliability and working quality of the system, to improve the life of hydraulic components and to reduce the noise of the system. The control of fluid pulsation in hydraulic system has been a technical problem which has not been solved well. The filter installed in hydraulic system has a good effect on the attenuation of fluid pulsation. In this paper, a simple and dexterous mechanical resonance mechanism, diaphragm vibrating fluid filter, is presented. Specific studies include: 1. A diaphragm vibrating fluid filter structure is proposed. The pressure pulsation characteristics of hydraulic system are analyzed and a simple and dexterous mechanical resonance mechanism is designed based on the mechanism of dynamic vibration absorber. The structure of the filter is preliminarily designed. 2. The mathematical model of the vibration of pretension flexible membrane is established, and the natural frequency of the flexible film is solved. The natural frequency of pretension flexible membrane is solved by using hyperelastic membrane theory, and the fluid-solid coupling modal analysis of pretension flexible membrane model is carried out by using finite element analysis software Adina, and the dynamic characteristics of fluid-structure coupling of flexible membrane are studied. It provides the basis for the design of filter. 3. The attenuation characteristics of the fluid filter are simulated by computational fluid dynamics (CFD) method. By simplifying the filter model and setting the relevant simulation parameters, the transient dynamics of the model is analyzed. The frequency and attenuation characteristics of the filter are studied. 4. The attenuation characteristics of diaphragm fluid filter are measured experimentally. The hydraulic vibration test rig was established and the experimental prototype of the diaphragm filter was developed. The attenuation characteristics of the filter were tested. The simulation results are compared with the simulation results to show the correctness of the simulation analysis.
【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

【引证文献】