發(fā)布時間：2018-07-12 10:30

  本文選題：輪胎 + 復(fù)雜花紋溝�。� 參考：《東華大學(xué)》2017年碩士論文

【摘要】：輪胎噪聲是汽車噪聲的主要組成部分,當(dāng)汽車高速行駛時,輪胎噪聲占汽車噪聲的比例高達80%。針對輪胎噪聲問題,歐盟出臺了2009/1222/EC輪胎標(biāo)簽法規(guī),規(guī)定各種型號輪胎的具體噪聲限值,這是我國輪胎出口業(yè)面臨的嚴(yán)峻挑戰(zhàn),而要解決技術(shù)性貿(mào)易壁壘,就必須克服技術(shù)瓶頸。泵氣噪聲是輪胎噪聲的主要貢獻源,而合理的花紋溝結(jié)構(gòu)設(shè)計是減少泵氣噪聲的有效方法,越來越多的研究者意識到胎面花紋對輪胎降噪的重要性。目前由于實驗研究泵氣噪聲的難度較大,而有限元仿真技術(shù)則發(fā)展迅速,因此研究復(fù)雜花紋溝空氣動力學(xué)數(shù)值模擬方法及其應(yīng)用成為目前學(xué)術(shù)界和工程界的重要課題。本文以輪胎復(fù)雜花紋溝為研究對象,基于有限元軟件ABAQUS對帶有復(fù)雜花紋溝的12.00R20載重子午線輪胎進行瞬態(tài)滾動分析,利用Python編程語言編寫程序處理結(jié)果,得到不同速度工況下花紋溝泵氣過程胎面體表面下壓量隨時間的變化曲線,并以此作為空氣動力學(xué)仿真計算的邊界條件;基于ANSYS Workbench仿真平臺使用大渦模擬和動網(wǎng)格技術(shù),通過System Coupling模塊進行雙向流固耦合模擬,提出了一套復(fù)雜花紋溝空氣動力學(xué)仿真方法,通過仿真分析了復(fù)雜花紋溝的流場特征和渦流的運動規(guī)律,并對比有無小溝槽存在時的流場狀態(tài);最后基于流場計算結(jié)果,采用FW-H聲學(xué)計算法建立噪聲預(yù)測方法,并利用方法探討花紋溝結(jié)構(gòu)對泵氣噪聲的影響規(guī)律。通過本文建立的方法對復(fù)雜花紋溝進行仿真計算,得到了花紋溝泵氣過程的流場狀況,分析結(jié)果表明:花紋溝槽出口處流場復(fù)雜,氣體進入外部流場后,在出口兩端花紋塊壁面開始形成渦流,渦流在流場中周期性的形成并向外擴散,這一過程引起流場壓力波動,是泵氣噪聲產(chǎn)生的重要原因;另一方面,小溝槽起到了分流作用,主溝槽出口流速和外流場渦流強度均比無小溝槽的復(fù)雜花紋溝小,驗證了復(fù)雜花紋溝槽中小溝槽設(shè)計的合理性�；诹鲌鼋Y(jié)果對復(fù)雜花紋溝的泵氣噪聲進行了預(yù)測,分析結(jié)果表明:泵氣噪聲屬于高頻噪聲;花紋溝狀態(tài)改變瞬間的聲壓變化最大;小溝槽存在的復(fù)雜花紋溝泵氣噪聲更小;花紋溝的寬度、高度的增大都會使泵氣噪聲增加,而壁面拔模角的增大會使花紋溝的泵氣噪聲減小;其中花紋溝高度對泵氣噪聲的影響最大,寬度最小,拔模角次之。本文通過研究為輪胎花紋的結(jié)構(gòu)設(shè)計提供數(shù)值模擬方法和理論參考,為完善輪胎低噪聲性能評價體系提供研究工作基礎(chǔ),為提升我國輪胎產(chǎn)業(yè)的研發(fā)效率與輪胎質(zhì)量等級提供技術(shù)支持。
[Abstract]:Tire noise is the main component of automobile noise. When the vehicle is driving at high speed, the proportion of tire noise to vehicle noise is as high as 80%. Aiming at the problem of tire noise, EU issued the 2009 / 1222 / EC tire label regulation, which stipulates the specific noise limit value of various types of tyres. This is a severe challenge faced by the tire export industry of our country. In order to solve the technical barriers to trade, we must overcome the technical bottleneck. Pump noise is the main contribution of tire noise, and reasonable design of pattern groove structure is an effective method to reduce pump air noise. More and more researchers realize the importance of tread pattern to tire noise reduction. At present, it is difficult to study pump air noise by experiment, and the finite element simulation technology is developing rapidly. Therefore, the research on aerodynamic numerical simulation method of complex pattern groove and its application has become an important subject in academic and engineering circles. Based on the finite element software Abaqus, the transient rolling analysis of 12.00R20 truck radial tire with complex pattern groove is carried out in this paper, and the processing results are programmed by Python programming language. The variation curve of pressure on the surface of tread surface under different velocity conditions is obtained, which is taken as the boundary condition of aerodynamics simulation, and the large eddy simulation and moving grid technology are used based on ANSYS Workbench simulation platform. A set of aerodynamics simulation method for complex pattern groove is proposed by system coupling module, and the characteristics of flow field and the motion law of eddy current are analyzed by simulation. Finally, based on the flow field calculation results, the noise prediction method is established by using FW-H acoustical calculation method, and the influence law of pattern groove structure on pump air noise is discussed by using the method. Through the simulation calculation of the complex pattern groove by the method established in this paper, the flow field of the pattern groove pump gas process is obtained. The analysis results show that the flow field at the outlet of the pattern groove is complicated and the gas enters the external flow field. On the other hand, the vortex is formed periodically in the flow field and diffuses outwards. This process causes the pressure fluctuation of the flow field, which is the important cause of the pump air noise. On the other hand, the small grooves play the role of shunt. The flow velocity at the outlet of the main groove and the eddy current intensity of the outflow field are smaller than those of the complex pattern groove without a small groove, which verifies the rationality of the design of the small groove with the complex pattern groove. Based on the flow field results, the pump air noise of complex pattern groove is predicted. The results show that the pump air noise belongs to high frequency noise, the change of sound pressure in the moment of change of pattern groove state is the biggest, the air noise of complex pattern groove pump with small groove is even less. The increase of the width and height of the pattern groove will increase the pump air noise, while the increase of the wall drawing angle will reduce the pump air noise of the pattern groove, in which the height of the pattern groove has the greatest influence on the pump air noise, the width is the smallest, and the drawing angle is the second. This paper provides the numerical simulation method and theoretical reference for the tire pattern structure design, and provides the research foundation for improving the tire low noise performance evaluation system. Provide technical support for improving R & D efficiency and tire quality grade of tire industry in China.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U463.341;O35

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