本文選題：金剛石圓鋸片　切入點(diǎn)：降噪孔　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：花崗石等硬質(zhì)石材荒料的鋸解普遍采用大直徑金剛石圓鋸片。金剛石圓鋸片屬于典型的大徑厚比構(gòu)件,軸向剛度較低,并且為了減小鋸縫、節(jié)約石材資源,圓鋸片基體繼續(xù)向薄型化發(fā)展,在鋸解中更易發(fā)生橫向振動(dòng)產(chǎn)生噪聲。在圓鋸片基體表面開設(shè)降噪孔是一種常用的減振降噪方式。選取鋸解花崗石荒料常用的大直徑金剛石圓鋸片基體,研究其振動(dòng)特性和聲輻射特性,探究其降噪孔參數(shù)的減振降噪效果,可為金剛石圓鋸片減振降噪結(jié)構(gòu)的優(yōu)化設(shè)計(jì)提供依據(jù)。結(jié)合有限元法邊界元法分析金剛石圓鋸片的振動(dòng)特性與聲輻射特性。引入模態(tài)映射方法計(jì)算金剛石圓鋸片振動(dòng)位移響應(yīng),并將其映射到邊界元網(wǎng)格作為邊界條件,通過(guò)邊界元方法求解金剛石圓鋸片聲輻射特性,探究降噪孔結(jié)構(gòu)對(duì)金剛石圓鋸片振動(dòng)和聲場(chǎng)的影響及其降噪機(jī)理;對(duì)二排降噪孔金剛石圓鋸片結(jié)構(gòu)進(jìn)行正交仿真優(yōu)化設(shè)計(jì),采用FEM/BEM聯(lián)合仿真方法優(yōu)化開降噪孔金剛石圓鋸片結(jié)構(gòu),提出一種金剛石圓鋸片降噪結(jié)構(gòu)的主動(dòng)設(shè)計(jì)方法。研究發(fā)現(xiàn)在金剛石圓鋸片表面開降噪孔會(huì)使金剛石圓鋸片的固有頻率略微降低,其固有振型主要為影響金剛石圓鋸片振動(dòng)特性的主要模態(tài)振型——軸向振型;降噪孔結(jié)構(gòu)的減振降噪機(jī)理主要是通過(guò)其對(duì)金剛石圓鋸片軸向振型的分離異化作用,將部分振幅峰值區(qū)域面積大的整體振型分割成振幅峰值區(qū)域面積小的局部振型,從而達(dá)到減振降噪的目的,開設(shè)二排降噪孔可以進(jìn)一步分離異化一排降噪孔所沒(méi)有分割的部分整體振型,得到更好的減振降噪效果;通過(guò)正交仿真試驗(yàn)分析得出降噪孔結(jié)構(gòu)參數(shù)對(duì)金剛石圓鋸片聲功率級(jí)影響的敏感程度,并找出一種較優(yōu)的Φ1300金剛石圓鋸片降噪孔參數(shù)組合,同時(shí)對(duì)優(yōu)化后的金剛石圓鋸片進(jìn)行降噪孔形狀的優(yōu)化。引入模態(tài)映射法分析了金剛石圓鋸片的振動(dòng)特性和聲輻射特性,在確保計(jì)算精度的情況下簡(jiǎn)化計(jì)算量,為降噪孔結(jié)構(gòu)的減振降噪機(jī)理研究提供了一定的依據(jù);設(shè)計(jì)正交仿真優(yōu)化試驗(yàn)為開降噪孔金剛石圓鋸片的主動(dòng)設(shè)計(jì)提供參考。
[Abstract]:Large diameter diamond saw blade is widely used in sawing hard stone materials such as granite. Diamond circular saw blade is a typical large diameter thickness ratio member with low axial stiffness. In order to reduce the sawing gap and save stone resources, diamond circular saw blade is a typical component with large diameter to thickness ratio. Circular saw blade matrix continues to thin development, It is easy to produce noise by transverse vibration in sawing. It is a common way to reduce vibration and noise by opening noise-reducing holes on the surface of circular sawing blade. The large diameter diamond circular saw blade matrix which is commonly used in sawing granite waste material is selected. The characteristics of vibration and acoustic radiation are studied, and the effect of reducing vibration and noise of the noise reduction hole parameters is studied. It can provide the basis for the optimization design of the vibration and noise reduction structure of the diamond circular saw blade. The vibration and acoustic radiation characteristics of the diamond circular saw blade are analyzed with the boundary element method of finite element method. The modal mapping method is introduced to calculate the vibration displacement response of the diamond circular saw blade. The acoustic radiation characteristics of diamond circular saw blade are solved by boundary element method, and the effect of noise reduction hole structure on the vibration and sound field of diamond circular saw blade and its noise reduction mechanism are explored. The structure of the second row de-noised diamond circular saw blade is optimized by orthogonal simulation, and the structure of the diamond circular saw blade with the open noise reduction hole is optimized by the FEM/BEM method. An active design method for noise reduction structure of diamond circular saw blade is presented. It is found that the natural frequency of diamond circular saw blade will be slightly reduced by opening a noise reduction hole on the surface of diamond circular saw blade. Its natural mode is mainly the main mode mode-axial mode which affects the vibration characteristics of diamond circular saw blade, and the mechanism of noise reduction and noise reduction is mainly through its dissimilation to the axial vibration mode of diamond circular saw blade. The whole vibration mode with large area of partial amplitude peak region is divided into local vibration mode with small area of amplitude peak region, so as to reduce vibration and noise. Setting up two rows of noise reduction holes can further separate part of the integral modes which are not separated by the dissimilated one row of noise reduction holes and obtain better vibration and noise reduction effect. The sensitivity of noise reduction hole structure parameters to the sound power level of diamond circular saw blade is obtained by orthogonal simulation analysis, and a better combination of noise reduction hole parameters of 桅 1300 diamond circular saw blade is found. At the same time, the noise reduction hole shape of the diamond circular saw blade after optimization is optimized. The vibration characteristics and acoustic radiation characteristics of the diamond circular saw blade are analyzed by using the modal mapping method, which simplifies the calculation amount under the condition of ensuring the calculation accuracy. It provides a certain basis for the study of vibration and noise reduction mechanism of noise reduction hole structure, and provides a reference for the active design of diamond circular saw blade with open noise reduction hole by designing orthogonal simulation optimization test.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU632

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