基于颗粒阻尼复合结构板的封闭空腔声学特性研究
发布时间：2018-07-18 14:17
【摘要】：NOPD（Non-Obstructive Particle Damping）技术是一种新型的阻尼技术，具有减振效果好、使用方便、价格低廉等特点。近几年国内外学者分别研究了颗粒阻尼材料的粒径、颗粒属性、填充率等对结构体减振效果的影响，但是将颗粒阻尼材料应用于降噪方面的研究还较少。因此本文借助封闭空腔结构旨在探究颗粒阻尼材料对封闭空腔的声学特性的影响。 本文主要从以下几个方面进行了研究： （1）根据稳态能量流法，用实验方法提取所研究颗粒阻尼材料的阻尼特性----即损耗因子曲线。 （2）根据模态分析理论，以力锤作为激励输入设备，采用SISO频域法对封闭空腔结构进行模态实验。同时根据有限元理论建立封闭空腔结构体的有限元模型，借助Nastran计算仿真模态。将实验结果和仿真计算结果对比以验证仿真模型的准确性。 （3）利用声学有限元理论建立封闭空腔的声学有限元模型，并分析计算其声腔模态。根据声-固耦合模态分析理论，计算分析无颗粒阻尼材料和有颗粒阻尼材料时封闭空腔的声-固耦合模态特性。 （4）借助声压传感器、激振器、信号采集分析仪等，测试分析不同数量颗粒阻尼材料对腔内声压的影响。同时借助仿真的方法分别建立不同的仿真模型，，利用仿真方法进行了对比分析。 研究表明，颗粒阻尼材料对封闭空腔结构的声-固耦合模态有一定的影响，并且随着颗粒阻尼材料的增加耦合模态频率增大。颗粒阻尼材料对降低封闭空腔内的噪声有一定效果。
[Abstract]:NOPD (Non-Obstructive Particle damping) technology is a new type of damping technology, which has the advantages of good damping effect, convenient use and low price. In recent years, scholars at home and abroad have studied the effects of particle size, particle properties and filling ratio on the damping effect of structure, but the research on the application of particle damping materials to noise reduction is still rare. Therefore, the purpose of this paper is to investigate the influence of particle damping material on the acoustic characteristics of the closed cavity. In this paper, the following aspects are studied: (1) according to the steady-state energy flow method, the damping characteristics of the particle damping materials studied are extracted by the experimental method, that is, the loss factor curve. (2) according to the modal analysis theory, The SISO frequency domain method is used to carry out the modal experiment of the closed cavity structure with the force hammer as the excitation input device. At the same time, the finite element model of the closed cavity structure is established according to the finite element theory, and the simulation mode is calculated by Nastran. The experimental results are compared with the simulation results to verify the accuracy of the simulation model. (3) the acoustic finite element model of the closed cavity is established by using the acoustic finite element theory, and the mode of the cavity is analyzed and calculated. According to the theory of acousto-solid coupling modal analysis, the characteristics of acousto-solid coupling mode of closed cavity without or with granular damping material are calculated and analyzed. (4) by means of sound pressure sensor, vibrator, signal acquisition analyzer, etc. The influence of different amount of particle damping materials on the sound pressure in the cavity was tested and analyzed. At the same time, different simulation models are established by means of simulation methods, and the simulation methods are compared and analyzed. The results show that the particle damping material has a certain influence on the acousto-solid coupling mode of the closed cavity structure, and the coupling mode frequency increases with the increase of the particle damping material. The particle damping material has certain effect on reducing the noise in the closed cavity.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535.1
本文编号：2132161
[Abstract]:NOPD (Non-Obstructive Particle damping) technology is a new type of damping technology, which has the advantages of good damping effect, convenient use and low price. In recent years, scholars at home and abroad have studied the effects of particle size, particle properties and filling ratio on the damping effect of structure, but the research on the application of particle damping materials to noise reduction is still rare. Therefore, the purpose of this paper is to investigate the influence of particle damping material on the acoustic characteristics of the closed cavity. In this paper, the following aspects are studied: (1) according to the steady-state energy flow method, the damping characteristics of the particle damping materials studied are extracted by the experimental method, that is, the loss factor curve. (2) according to the modal analysis theory, The SISO frequency domain method is used to carry out the modal experiment of the closed cavity structure with the force hammer as the excitation input device. At the same time, the finite element model of the closed cavity structure is established according to the finite element theory, and the simulation mode is calculated by Nastran. The experimental results are compared with the simulation results to verify the accuracy of the simulation model. (3) the acoustic finite element model of the closed cavity is established by using the acoustic finite element theory, and the mode of the cavity is analyzed and calculated. According to the theory of acousto-solid coupling modal analysis, the characteristics of acousto-solid coupling mode of closed cavity without or with granular damping material are calculated and analyzed. (4) by means of sound pressure sensor, vibrator, signal acquisition analyzer, etc. The influence of different amount of particle damping materials on the sound pressure in the cavity was tested and analyzed. At the same time, different simulation models are established by means of simulation methods, and the simulation methods are compared and analyzed. The results show that the particle damping material has a certain influence on the acousto-solid coupling mode of the closed cavity structure, and the coupling mode frequency increases with the increase of the particle damping material. The particle damping material has certain effect on reducing the noise in the closed cavity.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535.1
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