基于刚柔耦合的交流液压冲击式采煤工作机构动态特性仿真研究
发布时间：2019-06-11 03:59
【摘要】：本文以刚柔耦合交流液压冲击系统为研究对象，分析影响该系统性能的动态参数，并通过冲击破碎煤岩的数值模拟仿真，研究相关工作参数及结构参数对冲击系统的影响。该交流液压系统是基于冲击破煤机理而提出的，是冲击式采煤机破碎煤岩的主要工作机构。 论文在介绍课题研究的工程背景下，首先对煤岩破碎理论和冲击动力学的研究动态进行整体把握。充分掌握功率键合图建模规则后，根据交流液压技术原理分析刚柔耦合交流液压冲击系统的工作过程，建立该冲击系统的功率键合图并推导出数学模型。此外，本文从冲击动力学的角度出发，将冲击机构等效转换为冲击机械系统，建立其波动力学模型，着重研究煤岩破碎的相互作用过程中系统部件应力波变化规律、能量转换和冲击效率等过程，为交流液压冲击系统的模拟提供更加接近工况的边界条件。 在建立交流液压冲击系统的数学模型后，本文设计两指标的因素-水平正交实验表，找出影响系统动态特性相对敏感的因素与水平，，针对性实施模拟工作，为系统模型耦合参数的研究提高效率。根据所建立的数学模型，本文在ANSYS/LS-DYNA中进行煤岩破碎仿真，并在MATLAB/Simulink平台构建交流液压冲击系统的动态模型，结合模拟所产生的相关参数，研究交流液压系统动态冲击过程中系统压力、流量的变化规律，冲击刀架的位移、速度曲线，以及冲击过程中刀架的负载变化等。 在系统性能参数的研究过程中，本文利用MATLAB的GUI(GraphicsUser Interface)技术模块，调用Simulink仿真模型，开发了双向交流液压冲击系统的动态仿真平台。通过结构参数和工作参数的组合测试，仿真得出交流液压冲击系统的各项曲线，达到研究交流液压冲击系统动态特性的目的。 论文所研究的目的是通过对交流液压冲击系统的分析，建立冲击系统的动态方程及等效波动力学模型，从不同的角度研究冲击系统，借助计算机仿真研究系统的动态过程，不仅为研究双向交流液压冲击系统的动态特性提供高效的手段，同时也为冲击式采煤机冲击机构的研制提供理论依据和参考意义。
[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.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD421.6
本文编号：2496993
[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.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD421.6
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