共查询到20条相似文献,搜索用时 234 毫秒
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盾构推进液压系统同步协调控制仿真分析 总被引:2,自引:0,他引:2
设计了一种基于压力流量复合控制的盾构推进液压系统.采用AMESim和MATLAB仿真软件对推进液压系统同步协调控制进行了仿真比较分析.仿真结果表明采用主从式同步控制策略能够达到很好的同步效果,同步精度达到±1mm,为实际盾构同步推进提供了参考依据. 相似文献
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给出了采用压力流量复合控制的盾构掘进机推进液压系统工作模型,对其中的比例调速阀和比例溢流阀在AMESim环境下进行了模型构建,并完成了阀基本参数的优化设计.采用一种简化的动态土体粘弹性模型模拟盾构实际推进过程中的复杂负载工况.引入一种采用偏差修正参数的非线性PID控制器并在Matlab/Simulink环境下建模.为充分发挥各软件的优势,通过AMESim与Simulink接口界面,实现了液压控制系统的联合仿真.仿真结果表明,与常规PID控制相比,非线性PID对盾构推进液压系统的控制效果更佳. 相似文献
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利用FluidSIM-H软件对液压剪板机的油路及PLC控制进行了设计和仿真,并在PLC控制的液压实验台上进行了模拟实验。通过仿真和实验,验证了所设计系统的可行性。采用这种方法可让设计人员预先了解回路的动态特性,从而正确地估计回路实际运行时的工作状态,为系统的设计、分析、研究及优化方案提供支持。 相似文献
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为实现数控机床永磁直线同步电动机的磁悬浮运行,须对电动机的电磁推力和悬浮力进行实时控制。电磁推力和悬浮力的计算是数控机床磁悬浮永磁直线同步电动机设计及控制的基础。根据数控机床永磁直线同步电动机的磁悬浮运行机制,推导出电动机的电磁推力和悬浮力与电流之间关系的数学模型。并用Ansoft对电磁推力和悬浮力进行有限元分析,将解析计算结果与Ansoft的计算结果进行比较,验证了数学模型的有效性与正确性,为数控机床永磁直线同步电动机磁悬浮控制系统的分析与设计提供依据。 相似文献
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高速精密轧辊磨头止推轴承的性能是影响轧辊磨床加工稳定性和精度的重要因素。Roynolds方程是滑动轴承油膜压力计算的基础,文中基于有限差分法,对Roynolds方程进行量纲一化处理,并借助MATLAB软件强大的符号运算、数值计算及图形可视化处理功能,进行编程计算,求解了高速精密轧辊磨头止推轴承油膜的完整二维流动Roynolds方程。求解结果表明:液体静压止推轴承具有很高的承载能力和较高的油膜刚性,保证了磨头主轴的旋转精度和运动精度。研究结果对于高速轧辊磨床的整体设计具有一定的参考价值。 相似文献
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摘为了提高加工效率、改善工作环境,设计开发出一型气动盘式自动钻孔机。该专机采用模块化设计,具有自动转位、夹紧装置和自动钻孔功能,易于操作。本文给出了该机的原理和整体结构,介绍了钻孔模块部分。并以推力气缸为例,详细说明了整机气动回路的工作原理及其动作顺序。 相似文献
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This paper investigates a dynamic electromechanical coupling resulting from the air-gap fluctuation of the linear motor in machine tools. The modes of the mechanical vibration are analyzed firstly in the linear motor feed system. Then the influence of mechanical vibration on the air-gap fluctuation is researched. Based on the Maxwell's equation and energy method, the analytical expression of the motor thrust is established considering the air-gap fluctuation. Then we discuss the effects of air-gap fluctuation on the motor thrust. At last, the dynamic electromechanical coupling caused by the air-gap fluctuation is theoretically analyzed and verified by experiments. The results show that the mechanical vibration can affect the characteristics of the motor thrust conversely causing the fluctuation of the motor air-gap. The air-gap fluctuation can produce new thrust harmonics. These new thrust harmonics excite mechanical system again, and then the electromechanical coupling loop is formed, leading to a worse dynamic precision of the feed system. In addition, the couplings will aggravate with the increase of velocity and load. 相似文献
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Servo design of a vertical axis drive using dual linear motors for high speed electric discharge machining 总被引:3,自引:0,他引:3
Min-Fu Hsieh Chin-Juei Tung Wu-Sung Yao Meng-Chieh Wu Yunn-Shiuan Liao 《International Journal of Machine Tools and Manufacture》2007,47(3-4):546-554
This paper proposes a synchronous control scheme for a linear servo system applied to the vertical axis drive of a die-sinking electric discharge machine (EDM) tool. The investigated vertical axis drive is constructed with dual parallel linear motors, which are arranged to jointly drive the feed axis for improvement of the overall thrust and structural stiffness. A pneumatic cylinder is employed to compensate the gravitational effect of the feed axis with its electrode and holder. A mechanical coupling is designed to firmly bridge the two linear motors and carry the feed axis. Therefore, synchronous control for the motors is critical for not only position accuracy, but also machine safety. Moreover, by controlling the thrust outputs and positions of the motors to be as equal as possible, the potential “pull and drag” effect between the motors can be reduced and loads can also be equally shared. The proposed “position/thrust hybrid synchronous control” scheme is applied to the EDM to achieve high-speed, accurate machining, and the experimental results show that the synchronization error between the two parallel motors and the positioning accuracy are both satisfactory when operated under high-speed conditions. 相似文献
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This article presents a laboratory machine designed to perform orthogonal micro-cutting experiments. The machine allows an accurate control of the various cutting parameters and a direct comparison of micro- and macrocutting tool-material data bases. Research with the machine will focus on validating the application of macrocutting data to at least a range of microcutting applications and to define the limits beyond which such applications are no longer possible. The paper describes the machine and its design specifications and provides the validation of the performances claimed. The machine can cut in a reproducible manner with depths of cut as low as 1 μm, at speeds in the range 50–1000 mm/s, while measuring the cutting and thrust forces. The variability in nominal depth of cut is equal or better than 1 μm. Application examples illustrate the influence of lubrication and lead additions on the cutting process and demonstrate that the machine is indeed suitable for the application for which it was designed. 相似文献