波纹膜片共振式流体消声器衰减特性研究

发布时间：2018-02-23 07:59

本文关键词： 流体消声器波纹膜片流固耦合动力吸振压力脉动　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着液压噪声的日趋严重,先进液压传动技术的推广与应用大大受限。因此,研制高效抑制液压系统振动的流体消声器成了工程领域的紧迫任务。基于结构动力吸振原理,并考虑到既有流体消声器的缺点,本文提出了一种波纹膜片共振式流体消声器结构。该结构将波纹膜片作为附加吸振子,利用波纹膜片垂直挠度高灵敏性吸收油液中的压力脉动能,从而实现系统噪声的有效衰减。本文主要研究内容和成果如下:(1)通过对柱塞泵的理论输出流量分析,系统压力脉动源主要含有两种频率成分。介绍了结构动力吸振原理,并提出一种波纹膜片共振式流体消声器。该流体消声器通过波纹膜片载流状态下与压力脉动源发生共振来抑制压力脉动。(2)采用有限元法,仿真计算载流状态下波纹膜片的振动频率。由于流固耦合作用的存在,波纹膜片载流频率较真空中固有频率大大的降低。波纹膜片的载流频率随着半径的增大和膜片厚度的减小而降低,随波长的减小和波幅的增大而升高。(3)基于CFD流固耦合分析理论,利用ADINA软件建立了波纹膜片共振式流体消声器的有限元分析模型,并进行了流体消声器衰减特性仿真。仿真结果表明波纹膜片共振式流体消声器可以有效抑制系统压力脉动,且在波纹膜片载流频率附近效果最好。(4)对样机进行实验研究,结果表明流体消声器性能较好,与仿真结果大致吻合。同比圆薄板式流体消声器,波纹膜片式性能更突出。
[Abstract]:With the increasing severity of hydraulic noise, the popularization and application of advanced hydraulic transmission technology is greatly restricted. Therefore, it is an urgent task in the engineering field to develop a fluid muffler that can suppress the vibration of hydraulic system efficiently, based on the principle of structural dynamic vibration absorption. Considering the shortcomings of the existing fluid muffler, a corrugated diaphragm resonant fluid muffler structure is proposed in this paper, in which the corrugated diaphragm is used as the additional absorber. The vertical deflection of corrugated diaphragm is used to absorb the pressure pulsation energy in oil, so as to realize the effective attenuation of system noise. The main contents and results of this paper are as follows: 1) by analyzing the theoretical output flow rate of piston pump, The pressure pulsation source of the system mainly contains two kinds of frequency components. The principle of structural dynamic vibration absorption is introduced. A corrugated diaphragm resonant fluid muffler is proposed. The fluid muffler uses finite element method to suppress pressure pulsation by resonance with pressure pulsating source under the condition of corrugated diaphragm current. The vibration frequency of corrugated diaphragm is calculated by simulation under the condition of current carrying. Due to the existence of fluid-solid coupling, The current carrying frequency of corrugated diaphragm is much lower than that of the natural frequency in vacuum, and the current carrying frequency of corrugated diaphragm decreases with the increase of radius and the decrease of diaphragm thickness. Based on CFD fluid-solid coupling analysis theory, the finite element analysis model of ripple diaphragm resonant fluid muffler is established by using ADINA software. The simulation results show that the corrugated diaphragm resonant fluid muffler can effectively suppress the pressure pulsation of the system, and the experimental study on the prototype is carried out in the vicinity of the current carrying frequency of the corrugated diaphragm. The results show that the performance of the fluid muffler is better, which is consistent with the simulation results, and the corrugated diaphragm type is more prominent than the circular thin plate type of fluid muffler.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH137;TB535.2

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