發(fā)布時間：2018-05-18 20:17

  本文選題：凈化消聲器 + 聲學性能��； 參考：《合肥工業(yè)大學》2014年碩士論文

【摘要】：針對汽車廢氣和噪聲排放對環(huán)境造成重大污染問題，目前最普遍的方法就是在汽車的排氣系統(tǒng)中安裝催化轉化器和消聲器，分別承擔凈化尾氣排放和消除噪聲的功能。為了同時達到減少汽車尾氣污染排放和控制噪聲的雙重作用，節(jié)省空間結構，新型的凈化消聲器的應用將成為有效方法，因此，對凈化消聲器的總體性能研究，具有重要的理論意義和應用價值。 本文將凈化消聲器的蜂窩陶瓷載體作為多孔介質處理，闡述蜂窩陶瓷載體的非理想流體的聲學和動力學理論。凈化消聲器的聲學特性和流動特性與載體的長度、分布方式、穿孔率、進口內插管長度、載體位置等結構參數(shù)相關。本文建立凈化消聲器有限元模型，以聲學軟件Virtual.Lab和流體動力學軟件FLUENT為平臺，研究了簡單凈化消聲結構的聲學性能和流動特性，重點分析了結構參數(shù)對其性能的影響。通過正交試驗分析參數(shù)之間的關系，發(fā)現(xiàn)載體的長度和穿孔率對凈化消聲器總體性能的影響顯著。通過正交試驗數(shù)據(jù)結合回歸分析方法，設計出凈化消聲器總體性能預估模型，該預估模型精度較高，很好的反映出凈化消聲器總體性能與結構參數(shù)的關系，為凈化消聲器的設計奠定基礎；在此基礎上，設計一款新型的復雜凈化消聲器，在滿足催化轉化的前提下，，分析了該凈化消聲器的聲學性能和流動特性，并對此款凈化消聲器進行改進設計和分析，結果表明，改進后的凈化消聲器的整體性能得到提高。 本文應用數(shù)值仿真的方法研究新型凈化消聲器聲學性能和流動特性，探索新型凈化消聲器的分析和設計的關鍵問題，為設計高性能的凈化消聲器提供參考。
[Abstract]:In view of the serious environmental pollution caused by automobile exhaust gas and noise emission, the most common method is to install a catalytic converter and a muffler in the exhaust system of an automobile, which is responsible for the function of purifying exhaust gas emissions and eliminating noise, respectively. In order to reduce vehicle exhaust pollution and control noise at the same time and save space structure, the application of new purifying muffler will become an effective method. Therefore, the overall performance of purifying muffler is studied. It has important theoretical significance and application value. In this paper, the honeycomb ceramic carrier which purifies the muffler is treated as porous medium, and the acoustic and dynamic theory of the non-ideal fluid of the honeycomb ceramic carrier is expounded. The acoustic and flow characteristics of the purifying muffler are related to the structural parameters such as the length of the carrier, the distribution mode, the perforation rate, the length of the inlet tube, the position of the carrier, and so on. In this paper, the finite element model of purifying muffler is established. The acoustic performance and flow characteristics of simple purifying silencers are studied on the platform of acoustic software Virtual.Lab and hydrodynamic software FLUENT, and the influence of structural parameters on their performance is emphatically analyzed. The relationship between the parameters was analyzed by orthogonal test. It was found that the length of carrier and the perforation rate had a significant effect on the overall performance of the purifying muffler. Based on the orthogonal test data and regression analysis, a model for predicting the overall performance of a purifying muffler is designed. The prediction model has a high accuracy and reflects the relationship between the overall performance and the structural parameters of the purifying muffler. On the basis of this, a new type of complex purifying muffler is designed. Under the premise of catalytic transformation, the acoustic performance and flow characteristics of the purifying muffler are analyzed. The improved design and analysis of the purifying muffler show that the whole performance of the improved muffler has been improved. In this paper, numerical simulation method is used to study the acoustic performance and flow characteristics of a new type of purifying muffler, and to explore the key problems in the analysis and design of a new type of purifying muffler, which provides a reference for the design of a high performance purifying muffler.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB535.2

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