电驱冲击气锤的冲击性能建模和优化

发布时间：2018-06-13 16:51

本文选题：电锤 + 数值模拟　；参考：《浙江大学》2017年硕士论文

【摘要】：电驱冲击气锤简称电锤是一种应用广泛的电动工具,属于冲击机械的一种。目前国内电锤企业研发人员对电锤设计理论缺乏足够的认识,导致设计工作过于依赖经验,效率低下。为此,本文结合企业项目,通过数学推导建立了电锤冲击系统的仿真模型,并采用组合试验和优化设计等手段,对电锤的性能进行分析和优化,为电锤设计工作提供指导。全文共分为五章:第一章对电锤以及电动工具的国内外发展现状进行归纳总结,包括行业发展、研究现状等,分析了本文研究工作的必要性。在借鉴前人研究成果的基础上,选择研究的切入点和研究方法,从而确定了本文的组织结构;第二章首先建立了电锤驱动机构的数学模型,并编写了仿真程序,实现了工作过程的数值模拟。然后分析了气缸直径、冲击频率、撞锤初始位置、撞锤质量、曲柄长度、补气孔直径以及补气孔位置等电锤重要参数对工作性能的影响。最后对撞锤质量和曲柄长度两个参数进行了两因素三水平的组合试验,并将试验结果与仿真结果进行对比,验证了模型的可靠性;第三章根据波动力学建立了电锤冲击机构的数学模型,并编写了仿真程序,实现了电锤冲击凿岩过程以及应力波传递过程的数值模拟。然后通过组合试验方法分析了副锤结构参数的设计规律。为了验证模型的正确性,利用有限元方法与所编写的模拟程序计算结果进行了对比。最后通过优化方法对副锤结构进行了优化,并进行试验,对比试验数据和理论计算结果,验证了理论模型的可靠性;第四章将驱动机构数学模型和冲击机构数学模型相结合,建立了整个冲击系统的仿真模型。在此基础上,以冲击系统结构参数作为优化变量,以单次凿入量为优化目标,对冲击系统在不同工况下的工作性能进行了优化,得出了对不同工况都有良好适应性的优化方案;第五章对全文的工作做了总结,并对后续的研究工作进行了展望。
[Abstract]:Electric drive impact gas hammer is a widely used electric tool, which belongs to impact machine. At present, the R & D personnel of domestic electric hammer enterprises lack sufficient understanding of the design theory of electric hammer, which results in the design work relying too much on experience and inefficiency. In this paper, the simulation model of electric hammer impact system is established by mathematical derivation combined with enterprise project, and the performance of electric hammer is analyzed and optimized by means of combination test and optimization design, which provides guidance for hammer design. The paper is divided into five chapters: the first chapter summarizes the development of electric hammer and electric tools at home and abroad, including the development of the industry, the status quo of research, and analyzes the necessity of the research work in this paper. On the basis of drawing lessons from the previous research results, the paper chooses the breakthrough point and research method to determine the organization structure of this paper. In chapter 2, the mathematical model of the electric hammer driving mechanism is established, and the simulation program is written. The numerical simulation of the working process is realized. Then the effects of cylinder diameter, impact frequency, initial position of hammer, mass of hammer, length of crank, diameter of air supply hole and position of air supply hole on the working performance of electric hammer are analyzed. Finally, the impact hammer mass and crank length are tested in combination with two factors and three levels, and the reliability of the model is verified by comparing the test results with the simulation results. In chapter 3, according to the wave mechanics, the mathematical model of the hammer shock mechanism is established, and the simulation program is compiled to realize the numerical simulation of the hammer impact rock drilling process and the stress wave transfer process. Then the design law of the structural parameters of the auxiliary hammer is analyzed by the combined test method. In order to verify the correctness of the model, the finite element method is compared with the calculated results of the simulation program. Finally, the auxiliary hammer structure is optimized by optimization method, and the experimental results are compared to verify the reliability of the theoretical model. Chapter four combines the driving mechanism mathematical model with the impact mechanism mathematical model. The simulation model of the whole impact system is established. On this basis, taking the structural parameters of the impact system as the optimization variable and the single chisel as the optimization objective, the working performance of the impact system under different working conditions is optimized, and the optimal scheme with good adaptability to different working conditions is obtained. The fifth chapter summarizes the work of the paper and prospects the future research work.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TS914.5

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