本文選題：組合圓鋸片 + 耦合振動(dòng)��； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：我國是花崗石板材生產(chǎn)消費(fèi)大國,而組合金剛石圓鋸片以其高鋸解效率、低生產(chǎn)成本的巨大優(yōu)勢逐漸成為了國內(nèi)窄幅面花崗石板材鋸解的主要方式。組合圓鋸片將多片鋸片集合,鋸解板材時(shí)振動(dòng)嚴(yán)重,引發(fā)噪聲污染,且工作時(shí)各片間振動(dòng)發(fā)生耦合,導(dǎo)致組合圓鋸片振動(dòng)噪聲問題更加復(fù)雜。大量研究表明在圓鋸片基體開孔可以降低其輻射噪聲,但目前只停留在對單片鋸的研究上,因此將單片鋸基體開孔減振降噪的技術(shù)引入組合圓鋸片振動(dòng)噪聲研究中,對探索高效、綠色組合圓鋸片基體設(shè)計(jì)方法意義重大。將結(jié)構(gòu)有限元方法與聲學(xué)邊界元方法集成運(yùn)用到組合金剛石圓鋸片減振降噪技術(shù)研究中,研究降噪孔對組合圓鋸片振動(dòng)噪聲的影響。采用結(jié)構(gòu)有限元方法分析組合圓鋸片固有振動(dòng)模態(tài),探究其與單片鋸的區(qū)別;基于疊加原理對組合圓鋸片進(jìn)行速度頻率響應(yīng)分析,探究組合圓鋸片耦合振動(dòng)特性;再將組合圓鋸片各節(jié)點(diǎn)振動(dòng)速度頻響數(shù)據(jù)一一映射到聲學(xué)面網(wǎng)格,通過聲學(xué)邊界元方法分析其聲輻射特性,探究組合圓鋸片最優(yōu)降噪孔設(shè)計(jì)方案。研究建立了基于有限元的Φ1600mm三片套組合圓鋸片耦合頻率響應(yīng)計(jì)算模型,依據(jù)該模型獲取了組合圓鋸片耦合振動(dòng)特性,得出小鋸片和中間片受耦合影響大于大鋸片,同時(shí)分析了耦合作用下基體開孔對組合圓鋸片振動(dòng)速度特性的影響規(guī)律,得出了選擇全部鋸片開孔較單片開孔更有助于降低各對應(yīng)鋸片的振動(dòng)強(qiáng)度,組合圓鋸片整體開降噪孔后,小鋸片和中間片振動(dòng)改變量明顯大于大鋸片,表明小鋸片和中間片受基體開孔影響大于大鋸片,由此設(shè)計(jì)基于小鋸片和中間鋸片的孔型參數(shù)優(yōu)化方案,并研究了各設(shè)計(jì)方案的輻射聲場特性,通過對比分析各開孔組合圓鋸片輻射聲功率級,推薦給出了最佳降噪效果的Φ1600mm三片套組合圓鋸片降噪孔設(shè)計(jì)參數(shù)。研究通過有限元方法求解振動(dòng)速度響應(yīng)設(shè)計(jì)開孔片方案、邊界元方法計(jì)算各方案輻射噪聲確定組合圓鋸片最優(yōu)開孔結(jié)構(gòu),為高性能環(huán)保型組合圓鋸片基體研發(fā)提出了主動(dòng)設(shè)計(jì)方法,建立的耦合頻率響應(yīng)計(jì)算模型為組合圓鋸片耦合振動(dòng)特性研究奠定了基礎(chǔ),為更多片數(shù)組合圓鋸片基體研發(fā)提供了參考。
[Abstract]:China is a large country in the production and consumption of granite plate, and the combined diamond circular saw blade has gradually become the main way of sawing narrow granite plate because of its great advantages of high sawing efficiency and low production cost. The combined circular saw blade gathers the multi-blade saw blade, which causes serious vibration and noise pollution when the plate is sawed, and the vibration of the combined circular saw blade is coupled with each other during operation, which makes the vibration and noise problem of the combined circular saw blade more complicated. A large number of studies have shown that opening holes in circular saw blades can reduce its radiation noise, but at present it only focuses on the study of monolithic saws. Therefore, the technology of reducing vibration and noise by opening holes in monolithic saws is introduced into the study of vibration and noise of composite circular saw blades. It is of great significance to explore the efficient and green composite circular saw blade matrix design method. The structural finite element method (FEM) and acoustic boundary element method (BEM) are integrated into the study of vibration and noise reduction technology for composite diamond circular saw blades. The effect of noise reduction holes on vibration and noise of composite circular saw blades is studied. The structural finite element method is used to analyze the inherent vibration modes of the combined circular saw blade, and the difference between the composite saw blade and the monolithic saw is explored, the velocity and frequency response of the combined circular saw blade is analyzed based on the superposition principle, and the coupled vibration characteristics of the combined circular saw blade are explored. The frequency response data of each node of combined circular saw blade are mapped to the acoustic surface grid one by one. The acoustic radiation characteristics of the combined circular saw blade are analyzed by the acoustic boundary element method, and the optimal design scheme of the noise-reducing hole is explored. The coupling frequency response model of 桅 1600mm three-piece combined circular saw blade based on finite element method is established. According to the model, the coupling vibration characteristics of combined circular saw blade are obtained. It is concluded that the coupling effect between small saw blade and intermediate blade is greater than that of large saw blade. At the same time, the influence of the matrix opening on the vibration velocity characteristics of the combined circular saw blade is analyzed. It is concluded that the selection of all the holes in the saw blade is more helpful to reduce the vibration intensity of the corresponding saw blade than the single blade. The vibration change of small saw blade and intermediate blade is obviously larger than that of large saw blade, which indicates that small saw blade and intermediate blade are more affected by the opening of substrate than large saw blade. The optimization scheme of pass parameters based on small saw blade and middle saw blade is designed, and the characteristics of radiation sound field of each design scheme are studied. By comparing and analyzing the radiation sound power level of circular saw blade with different holes, It is recommended that the design parameters of the noise reduction hole of 桅 1600mm three liner combined circular saw blade with the best noise reduction effect are given. The finite element method (FEM) is used to solve the vibration velocity response and the boundary element method (BEM) is used to calculate the radiation noise of each scheme to determine the optimal opening structure of the combined circular saw blade. An active design method is proposed for the research and development of high performance and environment-friendly composite circular saw blade matrix. The calculation model of coupling frequency response establishes a foundation for the study of coupling vibration characteristics of combined circular saw blade. This paper provides a reference for the research and development of more composite circular saw blade matrix.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU632

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