锯解花岗石用组合金刚石圆锯片振动声辐射特性研究

发布时间：2018-05-23 06:22

本文选题：组合圆锯片 + 耦合振动　；参考：《山东大学》2017年硕士论文

【摘要】：我国是花岗石板材生产消费大国,而组合金刚石圆锯片以其高锯解效率、低生产成本的巨大优势逐渐成为了国内窄幅面花岗石板材锯解的主要方式。组合圆锯片将多片锯片集合,锯解板材时振动严重,引发噪声污染,且工作时各片间振动发生耦合,导致组合圆锯片振动噪声问题更加复杂。大量研究表明在圆锯片基体开孔可以降低其辐射噪声,但目前只停留在对单片锯的研究上,因此将单片锯基体开孔减振降噪的技术引入组合圆锯片振动噪声研究中,对探索高效、绿色组合圆锯片基体设计方法意义重大。将结构有限元方法与声学边界元方法集成运用到组合金刚石圆锯片减振降噪技术研究中,研究降噪孔对组合圆锯片振动噪声的影响。采用结构有限元方法分析组合圆锯片固有振动模态,探究其与单片锯的区别;基于叠加原理对组合圆锯片进行速度频率响应分析,探究组合圆锯片耦合振动特性;再将组合圆锯片各节点振动速度频响数据一一映射到声学面网格,通过声学边界元方法分析其声辐射特性,探究组合圆锯片最优降噪孔设计方案。研究建立了基于有限元的Φ1600mm三片套组合圆锯片耦合频率响应计算模型,依据该模型获取了组合圆锯片耦合振动特性,得出小锯片和中间片受耦合影响大于大锯片,同时分析了耦合作用下基体开孔对组合圆锯片振动速度特性的影响规律,得出了选择全部锯片开孔较单片开孔更有助于降低各对应锯片的振动强度,组合圆锯片整体开降噪孔后,小锯片和中间片振动改变量明显大于大锯片,表明小锯片和中间片受基体开孔影响大于大锯片,由此设计基于小锯片和中间锯片的孔型参数优化方案,并研究了各设计方案的辐射声场特性,通过对比分析各开孔组合圆锯片辐射声功率级,推荐给出了最佳降噪效果的Φ1600mm三片套组合圆锯片降噪孔设计参数。研究通过有限元方法求解振动速度响应设计开孔片方案、边界元方法计算各方案辐射噪声确定组合圆锯片最优开孔结构,为高性能环保型组合圆锯片基体研发提出了主动设计方法,建立的耦合频率响应计算模型为组合圆锯片耦合振动特性研究奠定了基础,为更多片数组合圆锯片基体研发提供了参考。
[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.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU632

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