【摘要】：摘要：工程機(jī)械給人類社會的發(fā)展帶來了巨大的貢獻(xiàn),但是,隨著工程機(jī)械的迅猛發(fā)展,它也給人們帶來了一些困擾,比如噪聲、尾氣污染等問題。工程機(jī)械的噪聲問題已經(jīng)被多數(shù)發(fā)達(dá)國家所重視,并采取了一系列措施加以整改,甚至還頒布了一系列標(biāo)準(zhǔn)來限制工程機(jī)械噪聲給人們帶來的危害。所以,開展工程機(jī)械降噪的研究是十分有意義的。 本文以SWE17履帶式液壓挖掘機(jī)為研究對象來開展研究。本課題的研究主要包括以下幾個(gè)方面： 運(yùn)用DASP噪聲測試系統(tǒng)對SWE17微型液壓挖掘機(jī)的動(dòng)力室后側(cè)面進(jìn)行了聲強(qiáng)測試,記錄了其三維聲強(qiáng)圖,并對其噪聲信號進(jìn)行了頻譜分析,掌握了其聲場分布規(guī)律,結(jié)合導(dǎo)風(fēng)罩的模態(tài)分析以及風(fēng)扇的旋轉(zhuǎn)頻率確定了挖掘機(jī)的主要噪聲源,為實(shí)施降噪提供有效的依據(jù)。 針對冷卻風(fēng)扇系統(tǒng)引起的空氣動(dòng)力性噪聲,本文先建立了風(fēng)扇以及導(dǎo)流罩的三維實(shí)體模型,為流場仿真作準(zhǔn)備。 運(yùn)用Ansys軟件對實(shí)體模型進(jìn)行了三維流場仿真,得到了導(dǎo)風(fēng)罩內(nèi)(包括風(fēng)扇)的氣體流動(dòng)情況以及它與噪聲狀況的關(guān)系。 系統(tǒng)結(jié)構(gòu)參數(shù)優(yōu)化。探討冷卻風(fēng)扇系統(tǒng)噪聲與各參數(shù)的關(guān)系,包括風(fēng)扇和導(dǎo)風(fēng)罩的位置關(guān)系、葉尖間隙以及導(dǎo)風(fēng)罩形狀等等。 對優(yōu)化后的冷卻風(fēng)扇系統(tǒng)進(jìn)行噪聲測試,整機(jī)噪聲的聲壓級下降0.8dB(A)左右,風(fēng)扇系統(tǒng)部位聲強(qiáng)級下降1dB(A)左右。
[Abstract]:Abstract: construction machinery has brought great contributions to the development of human society, but with the rapid development of construction machinery, it has also brought some problems to people, such as noise, tail gas pollution and so on. The noise problem of construction machinery has been paid attention to by most developed countries, and a series of measures have been taken to correct it, and even a series of standards have been promulgated to limit the harm caused by the noise of construction machinery. Therefore, it is very meaningful to carry out the research of noise reduction of construction machinery. In this paper, SWE17 crawler hydraulic excavator as the research object. The research of this subject mainly includes the following aspects: the sound intensity of the rear side of the power chamber of SWE17 micro hydraulic excavator is measured by using DASP noise test system, the three-dimensional sound intensity diagram is recorded, the spectrum analysis of its noise signal is carried out, the distribution law of sound field is mastered, and the main noise source of excavator is determined according to the modal analysis of air guide cover and the rotating frequency of fan. It provides an effective basis for noise reduction. Aiming at the aerodynamic noise caused by cooling fan system, the three-dimensional solid model of fan and guide cover is established in this paper, which prepares for the simulation of flow field. The three-dimensional flow field of the solid model is simulated by Ansys software, and the gas flow in the air guide cover (including the fan) and its relationship with the noise condition are obtained. The structural parameters of the system are optimized. The relationship between the noise of the cooling fan system and the parameters is discussed, including the position relationship between the fan and the guide cover, the tip clearance and the shape of the guide cover, and so on. The noise test of the optimized cooling fan system shows that the sound pressure level of the whole machine noise decreases by about 0.8dB (A), and the sound intensity level of the fan system decreases by about 1dB (A).
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU621;TB535

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