【摘要】：本文以剛柔耦合交流液壓沖擊系統(tǒng)為研究對象，分析影響該系統(tǒng)性能的動態(tài)參數(shù)，并通過沖擊破碎煤巖的數(shù)值模擬仿真，研究相關工作參數(shù)及結構參數(shù)對沖擊系統(tǒng)的影響。該交流液壓系統(tǒng)是基于沖擊破煤機理而提出的，是沖擊式采煤機破碎煤巖的主要工作機構。 論文在介紹課題研究的工程背景下，首先對煤巖破碎理論和沖擊動力學的研究動態(tài)進行整體把握。充分掌握功率鍵合圖建模規(guī)則后，根據(jù)交流液壓技術原理分析剛柔耦合交流液壓沖擊系統(tǒng)的工作過程，建立該沖擊系統(tǒng)的功率鍵合圖并推導出數(shù)學模型。此外，本文從沖擊動力學的角度出發(fā)，將沖擊機構等效轉換為沖擊機械系統(tǒng)，建立其波動力學模型，著重研究煤巖破碎的相互作用過程中系統(tǒng)部件應力波變化規(guī)律、能量轉換和沖擊效率等過程，為交流液壓沖擊系統(tǒng)的模擬提供更加接近工況的邊界條件。 在建立交流液壓沖擊系統(tǒng)的數(shù)學模型后，本文設計兩指標的因素-水平正交實驗表，找出影響系統(tǒng)動態(tài)特性相對敏感的因素與水平，，針對性實施模擬工作，為系統(tǒng)模型耦合參數(shù)的研究提高效率。根據(jù)所建立的數(shù)學模型，本文在ANSYS/LS-DYNA中進行煤巖破碎仿真，并在MATLAB/Simulink平臺構建交流液壓沖擊系統(tǒng)的動態(tài)模型，結合模擬所產(chǎn)生的相關參數(shù)，研究交流液壓系統(tǒng)動態(tài)沖擊過程中系統(tǒng)壓力、流量的變化規(guī)律，沖擊刀架的位移、速度曲線，以及沖擊過程中刀架的負載變化等。 在系統(tǒng)性能參數(shù)的研究過程中，本文利用MATLAB的GUI(GraphicsUser Interface)技術模塊，調用Simulink仿真模型，開發(fā)了雙向交流液壓沖擊系統(tǒng)的動態(tài)仿真平臺。通過結構參數(shù)和工作參數(shù)的組合測試，仿真得出交流液壓沖擊系統(tǒng)的各項曲線，達到研究交流液壓沖擊系統(tǒng)動態(tài)特性的目的。 論文所研究的目的是通過對交流液壓沖擊系統(tǒng)的分析，建立沖擊系統(tǒng)的動態(tài)方程及等效波動力學模型，從不同的角度研究沖擊系統(tǒng)，借助計算機仿真研究系統(tǒng)的動態(tài)過程，不僅為研究雙向交流液壓沖擊系統(tǒng)的動態(tài)特性提供高效的手段，同時也為沖擊式采煤機沖擊機構的研制提供理論依據(jù)和參考意義。
[Abstract]:In this paper, the rigid-flexible coupling AC hydraulic impact system is taken as the research object, and the dynamic parameters affecting the performance of the system are analyzed, and the effects of relevant working parameters and structural parameters on the impact system are studied by numerical simulation of impact broken coal and rock. The AC hydraulic system is put forward based on the mechanism of impact coal breaking, and it is the main working mechanism of impact shearer to break coal and rock. In this paper, under the engineering background of the research, firstly, the research trends of coal and rock fragmentation theory and impact dynamics are grasped as a whole. After fully mastering the modeling rules of power bond graph, the working process of rigid-flexible coupling AC hydraulic impact system is analyzed according to the principle of AC hydraulic technology, and the power bond graph of the impact system is established and the mathematical model is deduced. In addition, from the point of view of impact dynamics, the impact mechanism is equivalent transformed into impact mechanical system, and its wave mechanics model is established, and the variation law of stress wave of system components in the process of coal and rock breakage is studied. The process of energy conversion and impact efficiency provides more close boundary conditions for the simulation of AC hydraulic impact system. After establishing the mathematical model of AC hydraulic impact system, this paper designs the horizontal orthogonal experimental table of two indexes, finds out the factors and levels that affect the dynamic characteristics of the system, and carries out the simulation work. It improves the efficiency for the study of coupling parameters of the system model. According to the established mathematical model, the coal and rock breakage simulation is carried out in ANSYS/LS-DYNA, and the dynamic model of AC hydraulic impact system is constructed on MATLAB/Simulink platform, combined with the relevant parameters produced by the simulation. The variation of system pressure and flow rate, the displacement and velocity curve of the impact tool holder, and the load change of the tool holder during the impact process are studied in the dynamic impact process of AC hydraulic system. In the research process of system performance parameters, the dynamic simulation platform of bidirectional AC hydraulic impact system is developed by using GUI (GraphicsUser Interface) technology module of MATLAB and calling Simulink simulation model. Through the combination test of structural parameters and working parameters, the curves of AC hydraulic impact system are obtained by simulation, and the dynamic characteristics of AC hydraulic impact system are studied. The purpose of this paper is to establish the dynamic equation and equivalent wave dynamic model of the impact system through the analysis of the AC hydraulic impact system, to study the impact system from different angles, and to study the dynamic process of the system with the help of computer simulation. It not only provides an efficient means for studying the dynamic characteristics of bidirectional AC hydraulic impact system, but also provides a theoretical basis and reference significance for the development of impact mechanism of impact shearer.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD421.6

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