薄板振动式流体滤波器滤波特性分析

发布时间：2018-05-29 15:56

本文选题：结构振动式 + 滤波器　；参考：《长沙理工大学》2012年硕士论文

【摘要】：随着液压技术向高速、高压、大功率方向发展，液压系统中的振动与噪声成为妨碍液压技术进步的重要因素之一，其中压力脉动噪声是液压系统噪声最主要的来源，所以抑制液压系统流量脉动和压力脉动是至关重要的。实践证明，，加装各种液压滤波器对减小系统的输入阻抗和增加对压力脉动衰减和吸收均有显著作用。其中结构振动式流体滤波器以机械结构振动的方式消减流体压力脉动，结构简单，流体压力损失小，在液压滤波控制中得到了应用。但是由于结构振动式流体滤波器频率选择性强，消除低频段脉动频率，结构体积比较大，无法满足实际应用需要。本文设计了一种薄板振动式流体滤波器，将结构振动式滤波器的振动元件集中到一个尺寸不大的弹性薄板上，从而大大减小了滤波器的总体积。主要进行如下研究：（1）分析了液压系统中泵源输出流量和压力的特征,研究了结构共振滤波的机理，并介绍了几种结构共振式流体滤波器的消振机理。（2）提出了一种薄板振动式流体滤波器结构，介绍了滤波器的物理模型及工作原理。从工作原理出发分析了薄板振动式流体滤波器的主要工作元件四周嵌定的弹性薄板在双边载流下的固有频率。（3）研究了液压管路动态特性方程，利用频率法中管道网路传递矩阵的形式，建立了薄板振动式流体滤波器的数学模型。并结合具体的负载，分析了流体滤波器在液压系统中的衰减特性，讨论了滤波器主要参数对滤波器衰减特性的影响。以此来指导滤波器样机的制造。（4）试制了液压系统薄板振动式流体滤波器样机，依照液压系统流体滤波器性能测试需要，搭建了液压振动测试实验台，并对样机进行了相关的实验研究。实验结果和仿真结果基本一致，表明薄板振动式流体滤波器能够衰减液压系统中、低频压力脉动，实现了结构谐振和流体谐振的双重滤波。
[Abstract]:With the development of hydraulic technology towards high speed, high pressure and high power, vibration and noise in hydraulic system become one of the most important factors that hinder the progress of hydraulic technology, among which pressure pulsation noise is the main source of hydraulic system noise. So it is very important to restrain the flow pulsation and pressure pulsation of hydraulic system. It is proved that the application of various hydraulic filters can reduce the input impedance of the system and increase the attenuation and absorption of pressure pulsation. The structural vibratory fluid filter is applied in hydraulic filter control because of its simple structure and small fluid pressure loss due to the reduction of fluid pressure pulsation by mechanical structure vibration. However, because of the strong frequency selectivity of the structural vibratory fluid filter and the elimination of the pulsating frequency in the low frequency band, the structure volume is relatively large, which can not meet the practical application needs. In this paper, a thin plate vibrating fluid filter is designed. The vibration elements of the structural vibration filter are concentrated on a small elastic thin plate, thus greatly reducing the total volume of the filter. The main findings are as follows: 1) the characteristics of pump output flow and pressure in hydraulic system are analyzed, the mechanism of structural resonance filter is studied, and the damping mechanism of several structural resonant fluid filters is introduced. A structure of thin plate vibrating fluid filter is presented. The physical model and working principle of the filter are introduced. Based on the working principle, the natural frequencies of elastic thin plates embedded around the main working elements of thin plate vibrating fluid filters are analyzed. In this paper, the dynamic characteristic equation of hydraulic pipeline is studied, and the mathematical model of thin plate vibrating fluid filter is established by using the form of transfer matrix of pipeline network in frequency method. The attenuation characteristics of the fluid filter in the hydraulic system are analyzed, and the influence of the main parameters of the filter on the attenuation characteristic of the filter is discussed. To guide the manufacture of filter prototype. A prototype of hydraulic system thin plate vibrating fluid filter is developed. According to the requirement of hydraulic system fluid filter performance testing, the hydraulic vibration test bench is built, and the related experimental research on the prototype is carried out. The experimental results are in good agreement with the simulation results. It shows that the thin plate vibrating fluid filter can attenuate the low frequency pressure pulsation in hydraulic system and realize the dual filtering of structural resonance and fluid resonance.
【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

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