【摘要】：NOPD（Non-Obstructive Particle Damping）技術是一種新型的阻尼技術，具有減振效果好、使用方便、價格低廉等特點。近幾年國內(nèi)外學者分別研究了顆粒阻尼材料的粒徑、顆粒屬性、填充率等對結構體減振效果的影響，但是將顆粒阻尼材料應用于降噪方面的研究還較少。因此本文借助封閉空腔結構旨在探究顆粒阻尼材料對封閉空腔的聲學特性的影響。 本文主要從以下幾個方面進行了研究： （1）根據(jù)穩(wěn)態(tài)能量流法，用實驗方法提取所研究顆粒阻尼材料的阻尼特性----即損耗因子曲線。 （2）根據(jù)模態(tài)分析理論，以力錘作為激勵輸入設備，采用SISO頻域法對封閉空腔結構進行模態(tài)實驗。同時根據(jù)有限元理論建立封閉空腔結構體的有限元模型，借助Nastran計算仿真模態(tài)。將實驗結果和仿真計算結果對比以驗證仿真模型的準確性。 （3）利用聲學有限元理論建立封閉空腔的聲學有限元模型，并分析計算其聲腔模態(tài)。根據(jù)聲-固耦合模態(tài)分析理論，計算分析無顆粒阻尼材料和有顆粒阻尼材料時封閉空腔的聲-固耦合模態(tài)特性。 （4）借助聲壓傳感器、激振器、信號采集分析儀等，測試分析不同數(shù)量顆粒阻尼材料對腔內(nèi)聲壓的影響。同時借助仿真的方法分別建立不同的仿真模型，，利用仿真方法進行了對比分析。 研究表明，顆粒阻尼材料對封閉空腔結構的聲-固耦合模態(tài)有一定的影響，并且隨著顆粒阻尼材料的增加耦合模態(tài)頻率增大。顆粒阻尼材料對降低封閉空腔內(nèi)的噪聲有一定效果。
[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.
【學位授予單位】：武漢科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB535.1

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