本文關(guān)鍵詞：小型離心風(fēng)機(jī)機(jī)械振動(dòng)分析及實(shí)驗(yàn)研究　出處：《華中科技大學(xué)》2011年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 小型離心風(fēng)機(jī) 葉輪結(jié)構(gòu)優(yōu)化 蝸殼結(jié)構(gòu)分析 彈性支撐振動(dòng)響應(yīng)分析

【摘要】：振動(dòng)是衡量離心風(fēng)機(jī)運(yùn)行好壞的重要指標(biāo)之一。離心風(fēng)機(jī)的振動(dòng)和動(dòng)力學(xué)問(wèn)題成為了關(guān)系到企業(yè)正常生產(chǎn)和設(shè)備安全的關(guān)鍵技術(shù)。風(fēng)機(jī)葉輪和蝸殼作為風(fēng)機(jī)的主要部件,其性能對(duì)風(fēng)機(jī)效率有極大的影響,是風(fēng)機(jī)運(yùn)行時(shí)振動(dòng)和噪聲的主要來(lái)源,因此,對(duì)其振動(dòng)特性進(jìn)行研究非常必要。 離心風(fēng)機(jī)葉輪是風(fēng)機(jī)能量轉(zhuǎn)換的核心部件,葉輪的好壞直接影響到風(fēng)機(jī)的安全系數(shù)。本文利用ANSYS軟件對(duì)葉輪進(jìn)行了強(qiáng)度計(jì)算和模態(tài)分析,并結(jié)合實(shí)際實(shí)驗(yàn)和反復(fù)的試算,提出了葉輪的設(shè)計(jì)優(yōu)化方案,優(yōu)化葉輪無(wú)論從加工性能和力學(xué)性能方面講,都比現(xiàn)用葉輪更具優(yōu)勢(shì)。 蝸殼是風(fēng)機(jī)振動(dòng)產(chǎn)生的主要部位之一。本文對(duì)蝸殼的固有頻率進(jìn)行了模擬計(jì)算,并探討了蝸殼不同部位壁厚的改變對(duì)其固有頻率的影響,提出了蝸殼的優(yōu)化方案,使其固有頻率遠(yuǎn)離風(fēng)機(jī)系統(tǒng)的基頻及其倍頻。 葉輪不平衡產(chǎn)生的偏心力是引起離心風(fēng)機(jī)振動(dòng)的重要原因之一。本文利用ANSYS有限元分析軟件對(duì)風(fēng)機(jī)支撐底座進(jìn)行了模態(tài)分析,求出了支撐底座的固有頻率;然后在支撐底座模態(tài)分析的基礎(chǔ)上分析了其在葉輪偏心力作用下的動(dòng)態(tài)響應(yīng)特性;并探尋了在不同的減振器剛度和不用的減振器布置方式下,支撐底座的動(dòng)態(tài)響應(yīng)變化規(guī)律,得到了現(xiàn)有支撐底座尺寸下最合適的減振器剛度以及現(xiàn)有減振器剛度下最優(yōu)的減振器布置范圍,對(duì)后續(xù)的風(fēng)機(jī)支撐底座結(jié)構(gòu)優(yōu)化有很好的指導(dǎo)作用。
[Abstract]:Vibration is one of the important indexes to evaluate the operation of centrifugal fan. The vibration and dynamics of centrifugal fan have become the key technology related to the normal production and equipment safety of the enterprise. The fan impeller and volute are the main fans. I need parts. Its performance has great influence on fan efficiency and is the main source of vibration and noise in fan operation. Therefore, it is very necessary to study its vibration characteristics. Centrifugal fan impeller is the core component of fan energy conversion, and the impeller directly affects the safety factor of fan. The strength calculation and modal analysis of impeller are carried out by using ANSYS software. Combined with practical experiments and repeated trial and calculation, the design optimization scheme of impeller is put forward. The optimization of impeller is superior to that of current impeller in terms of processing performance and mechanical property. Volute is one of the main parts of fan vibration. In this paper, the natural frequency of volute is simulated and calculated, and the influence of different wall thickness of volute on its natural frequency is discussed. The optimization scheme of volute case is put forward to keep its natural frequency away from the basic frequency and double frequency of fan system. The eccentric force caused by impeller unbalance is one of the important causes of centrifugal fan vibration. In this paper, the modal analysis of fan supporting base is carried out by using ANSYS finite element analysis software. The natural frequency of the supporting base is obtained. Based on the modal analysis of the supporting base, the dynamic response characteristics under the eccentric force of the impeller are analyzed. The dynamic response of the supporting base is studied under the different stiffness of the shock absorber and the arrangement of the vibration absorber. The optimum shock absorber stiffness under the existing supporting base size and the optimal shock absorber layout range under the existing shock absorber stiffness are obtained, which can be used as a good guide for the subsequent structural optimization of the fan support base.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：TH432;TB535

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