风机消声器的设计及机理研究

发布时间：2018-04-02 02:21

本文选题：风机　切入点：消声器　出处：《吉林大学》2014年硕士论文

【摘要】：随着人们生活水平的日益提高，噪声在人们的工作和生活中越来越受到关注。其中风机的噪声尤为突出，已经对人们产生了巨大的负面影响。怎样有效地降低风机的噪声具有重要意义和应用价值。通过对风机噪声源进行分析，控制噪声最有效的措施就是在风机出口管安装消声器。比较现有消声材料的优缺点，本文提出了利用纳米碳酸钙基天然乳胶复合材料这一新型消声材料来提高风机消声器的性能。本文首先以天然乳胶为基体，纳米碳酸钙粒子作为研究对象，制备不同纳米碳酸钙含量复合材料试样。对新型材料的力学性能和断口进行实验分析，选出性能最好的比例配置。实验结果表明，纳米碳酸钙含量为10%时，复合材料取得抗拉强度和扯断伸长率的最好效果。通过分析风机的主要噪声频率，在有限元理论和声波方程的基础上，来选择新型复合材料制成的不同消声结构，并分析了材料厚度、孔径大小和穿孔率对消声结构共振频率的影响。仿真结果显示，复合材料的厚度对其共振频率影响很大，随着厚度的增加，共振频率越高，最大位移越小。最后通过声学实验验证了新型材料的降噪效果。结果显示，，新型复合材料具有良好的消声降噪效果，具有良好的应用前景。
[Abstract]:With the increasing improvement of people's living standard, noise is paid more and more attention in people's work and life. It has a great negative impact on people. How to effectively reduce the noise of fan has important significance and application value. Through the analysis of the noise source of the fan, the most effective measure to control the noise is to install a muffler in the outlet pipe of the fan, and compare the advantages and disadvantages of the existing silencing materials. In this paper, the performance of fan muffler is improved by using nano-CaCO3 based natural latex composite, which is a new kind of sound suppression material. In this paper, the natural latex was used as the matrix and the nano-CaCO3 particles as the research object. The mechanical properties and fracture surface of the new material were analyzed experimentally. The experimental results show that the best results of tensile strength and elongation at break are obtained when the content of nanometer calcium carbonate is 10. By analyzing the main noise frequency of the fan, on the basis of the finite element theory and the acoustic wave equation, the different sound attenuation structures made of the new composite material are selected, and the thickness of the material is analyzed. The simulation results show that the thickness of composite material has a great influence on the resonance frequency, the higher the resonance frequency, the smaller the maximum displacement with the increase of the thickness. Finally, the noise reduction effect of the new material is verified by acoustic experiments, and the results show that the new composite material has a good noise reduction effect and has a good application prospect.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535.2

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