电锤冲击系统波动力学建模与分析
发布时间：2018-08-10 20:31
【摘要】：电锤是一种常见的在混凝土、砖墙等脆性材料上钻凿成孔的手持电动工具，通过冲击部件之间的撞击产生峰值极大的力脉冲，，是一类典型的冲击机械。电锤的冲击部件在撞击方向的尺寸比横向尺寸大得多，其工作过程中的撞击问题只有应用波动力学理论才能获得满意的解释。因此应用波动力学理论对电锤撞击过程进行研究，具有极为重要的理论意义和实用价值。 本文应用波动力学理论，围绕电锤冲击系统开展研究工作，主要研究内容如下： （1）应用波动力学理论，建立由弹性杆、非线性弹簧组成的电锤冲击系统动力学模型；提出电锤冲击系统数值计算方法；编制电锤冲击系统数值模拟程序MSIS.M。 （2）搭建电锤冲击实验系统以测试钻头中的应力波信号；针对冲击信号持续时间短、变化快等特点，对实测应力波信号进行消除趋势项和小波包去噪等预处理。 （3）针对冲击系统中撞击面特征参数难以确定的问题，提出基于相关系数法的参数辨识方法；并将该方法应用到电锤冲击系统撞击面特征参数辨识中。 （4）通过比较钻头中两个截面应力波的实验波形与模拟波形，验证电锤冲击系统数值模拟程序MSIS.M的有效性。 （5）应用电锤冲击系统数值模拟程序MSIS.M，探讨冲锤、钻头、工作介质之间的匹配关系，并根据应力波的传播规律对钻头结构进行优化，提高电锤冲击系统的凿入效率。 本文研究工作为电锤冲击系统的设计和电锤的选用提供了一定的理论依据。
[Abstract]:Electric hammer is a kind of common hand-held electric tool which drilled holes in brittle materials such as concrete and brick wall. It produces maximum peak force pulse by impact between impact parts. It is a kind of typical impact machinery. The dimension of the impact parts in the impact direction is much larger than that in the transverse direction. The impact problem in the working process can only be explained satisfactorily by applying the theory of wave mechanics. Therefore, it is of great theoretical significance and practical value to study the impact process of electric hammer by using wave mechanics theory. The main contents of this paper are as follows: (1) by using wave mechanics theory, the dynamic model of electric hammer impact system is established, which is composed of elastic rod and nonlinear spring. The numerical calculation method of electric hammer impact system is put forward, and the numerical simulation program MSIS.M.2. (2) the electric hammer impact test system is set up to test the stress wave signal in the bit, aiming at the characteristics of short duration and fast change of the impact signal. The signal of measured stress wave is pretreated with eliminating trend term and wavelet packet denoising. (3) aiming at the problem that the characteristic parameters of impact surface are difficult to determine in impact system, a parameter identification method based on correlation coefficient method is proposed. The method is applied to the identification of the characteristic parameters of the impact surface of the hammer impact system. (4) the experimental and simulated waveforms of the two cross-section stress waves in the bit are compared. The validity of the numerical simulation program MSIS.M for electric hammer impact system is verified. (5) the matching relationship among hammer, bit and working medium is discussed by using the numerical simulation program MSIS.Mof electric hammer impact system. According to the propagation law of stress wave, the structure of drill bit is optimized to improve the penetration efficiency of hammer impact system. This paper provides a theoretical basis for the design of hammer impact system and the selection of electric hammer.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU631
本文编号：2176116
[Abstract]:Electric hammer is a kind of common hand-held electric tool which drilled holes in brittle materials such as concrete and brick wall. It produces maximum peak force pulse by impact between impact parts. It is a kind of typical impact machinery. The dimension of the impact parts in the impact direction is much larger than that in the transverse direction. The impact problem in the working process can only be explained satisfactorily by applying the theory of wave mechanics. Therefore, it is of great theoretical significance and practical value to study the impact process of electric hammer by using wave mechanics theory. The main contents of this paper are as follows: (1) by using wave mechanics theory, the dynamic model of electric hammer impact system is established, which is composed of elastic rod and nonlinear spring. The numerical calculation method of electric hammer impact system is put forward, and the numerical simulation program MSIS.M.2. (2) the electric hammer impact test system is set up to test the stress wave signal in the bit, aiming at the characteristics of short duration and fast change of the impact signal. The signal of measured stress wave is pretreated with eliminating trend term and wavelet packet denoising. (3) aiming at the problem that the characteristic parameters of impact surface are difficult to determine in impact system, a parameter identification method based on correlation coefficient method is proposed. The method is applied to the identification of the characteristic parameters of the impact surface of the hammer impact system. (4) the experimental and simulated waveforms of the two cross-section stress waves in the bit are compared. The validity of the numerical simulation program MSIS.M for electric hammer impact system is verified. (5) the matching relationship among hammer, bit and working medium is discussed by using the numerical simulation program MSIS.Mof electric hammer impact system. According to the propagation law of stress wave, the structure of drill bit is optimized to improve the penetration efficiency of hammer impact system. This paper provides a theoretical basis for the design of hammer impact system and the selection of electric hammer.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU631
【参考文献】
相关期刊论文 前4条
1 孙苗钟;;一种消除振动信号多项式趋势项的方法[J];仪器仪表与分析监测;2007年01期
2 徐小荷;;撞击凿入系统的数值计算方法[J];岩石力学与工程学报;1984年01期
3 赵统武，刘寿康，唐红平;具有接头系统的冲击凿入效率研究[J];岩石力学与工程学报;1994年01期
4 单仁亮,周富华,高全臣;接杆凿岩中接头能量传递特性与理想入射波形的研究[J];岩石力学与工程学报;1996年03期
本文编号：2176116
本文链接：https://www.wllwen.com/kejilunwen/sgjslw/2176116.html
