電錘沖擊系統(tǒng)波動力學建模與分析
發(fā)布時間：2018-08-10 20:31
【摘要】：電錘是一種常見的在混凝土、磚墻等脆性材料上鉆鑿成孔的手持電動工具，通過沖擊部件之間的撞擊產(chǎn)生峰值極大的力脈沖，，是一類典型的沖擊機械。電錘的沖擊部件在撞擊方向的尺寸比橫向尺寸大得多，其工作過程中的撞擊問題只有應用波動力學理論才能獲得滿意的解釋。因此應用波動力學理論對電錘撞擊過程進行研究，具有極為重要的理論意義和實用價值。 本文應用波動力學理論，圍繞電錘沖擊系統(tǒng)開展研究工作，主要研究內容如下： （1）應用波動力學理論，建立由彈性桿、非線性彈簧組成的電錘沖擊系統(tǒng)動力學模型；提出電錘沖擊系統(tǒng)數(shù)值計算方法；編制電錘沖擊系統(tǒng)數(shù)值模擬程序MSIS.M。 （2）搭建電錘沖擊實驗系統(tǒng)以測試鉆頭中的應力波信號；針對沖擊信號持續(xù)時間短、變化快等特點，對實測應力波信號進行消除趨勢項和小波包去噪等預處理。 （3）針對沖擊系統(tǒng)中撞擊面特征參數(shù)難以確定的問題，提出基于相關系數(shù)法的參數(shù)辨識方法；并將該方法應用到電錘沖擊系統(tǒng)撞擊面特征參數(shù)辨識中。 （4）通過比較鉆頭中兩個截面應力波的實驗波形與模擬波形，驗證電錘沖擊系統(tǒng)數(shù)值模擬程序MSIS.M的有效性。 （5）應用電錘沖擊系統(tǒng)數(shù)值模擬程序MSIS.M，探討沖錘、鉆頭、工作介質之間的匹配關系，并根據(jù)應力波的傳播規(guī)律對鉆頭結構進行優(yōu)化，提高電錘沖擊系統(tǒng)的鑿入效率。 本文研究工作為電錘沖擊系統(tǒng)的設計和電錘的選用提供了一定的理論依據(jù)。
[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.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU631
本文編號：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.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU631
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本文編號：2176116
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