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基于Linux的嵌入式数控机床控制系统设计 总被引:1,自引:0,他引:1
为了克服传统嵌入式数控系统的局限性,提高系统插补运算和人机交互能力,提出了基于ARM+FPGA+DSP+Linux架构的嵌入式数控系统设计方案,并设计了该系统的软硬件体系结构。为同时满足数控系统的多线程和实时性要求,采用了Linux+DSP结构,并结合实时性指标,对系统任务进行了详细的实时性分析与划分。为建立系统通讯,采用了模块化设计理念,并对模块间通讯机制的实现方法进行了详细论述。结果表明,基于Linux的嵌入式数控系统的实时性好,性能高,可移植性好。 相似文献
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将嵌入式技术与数控系统相结合,研究嵌入式数控系统的体系结构,提出了嵌入式数控系统的六大基本硬件结构模块,和分层次结构的软件体系,具有软硬件可裁剪、结构精简优化、插补控制实时性强、工作可靠的系统.基于OAN现场总线结构,对ARM10嵌入式微控制器芯片进行接口扩展,设计出上下位机多微处理器结构的嵌入式数控系统,适合于控制交流伺服电动机实现多轴联动,用于加工复杂型面.采用FPGA硬件插补技术,设计源码开放的伺服控制软件,实现2ms级的实时信号响应控制,形成开放性的具有自主知识产权的基于ARM微控制器和CAN现场总线结构的多轴联动嵌入式数控系统. 相似文献
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针对计算机数控系统的高级样条曲线直接插补控制问题,建立了笛卡尔空间坐标系下能通过已知多点并在首末端点为给定切矢量的二阶连续的多项式样条曲线的数学模型,基于该模型,提出了相应的插补格式及其C++实现方法,并给出了该样条插补预处理和实时插补计算方法,同时还建立了插补算法的精度和速度计算模型。实例计算表明:所提出的样条插补方法在满足较高进给速度的情况下,逼近精度可达0·5μm。 相似文献
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插补算法的误差及实时性研究 总被引:2,自引:0,他引:2
插补计算是数控系统最重要的运算工作,如何正确地选用插补算法,以保证插补运算的实时性和精度是开发数控系统的关键;通过对插补误差的分析,提出一种计算插补误差的算法——均差法,建立了均差法的数学模型,并利用均差法计算出DDA插补和时间分割插补的误差及插补计算时间。 相似文献
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针对一种基于PLC的开放式数控系统,应用NURBS(Non-Uniform Rational B-Spline)曲线插补技术,对传统的自由曲线插补算法进行改进.同时根据STEP-NC标准对CAD/CAM/CNC一体化的新型数控插补方法进行研究,利用ActiveX技术实现了与CAD系统的数据交换,并在实验数控系统中加以应用.实验结果证明该插补算法可以有效地提高实时插补速度和精度,提高数控系统的工作效率. 相似文献
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Yu-an Jin Yong He Jian-zhong Fu Zi-Chen Chen 《The International Journal of Advanced Manufacturing Technology》2013,69(1-4):405-416
A typical open computer numerical control (CNC) system should own the capability of being redeveloped easily and effectively, and any improvements of interpolation algorithm or machining technique could be put into practice by users conveniently. However, this is not always available in the current open CNC systems. To solve this problem, an interpolation method based on external profile mode (EPM) is introduced to improve the universality and the performance of an open CNC system in this paper. The method is realized with a rough interpolation in the PC host and a fine interpolation in the slave motion controller. With this method, various interpolation algorithms can be easily realized in the rough interpolation when machining complex contours. Meanwhile, the machining parameters during each interpolation cycle can be wholly determined by the host, so a real-time adjustment of machining parameters can be accomplished during the interpolation. The working principal of EPM is presented in this paper, and the realization of interpolation algorithms with the proposed method is described. A look-ahead algorithm for determining the machining parameters of each segment is implemented based on the length of segments in the rough interpolation. An acceleration/deceleration strategy with confined jounce is proposed in the look-ahead algorithm. The experimental results of specific profile interpolation show that the interpolation method based on EPM can make the open CNC system more universality and high performance. 相似文献
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Li-Bing Zhang You-Peng You Xue-Feng Yang 《The International Journal of Advanced Manufacturing Technology》2013,64(1-4):335-348
The advanced manufacture technology requires that multi-axis coordinated motion computer numerical control (CNC) machine tools have the capability of high smoothness and high precision. At present, the study of the motion smoothness mainly concentrates on the acceleration and deceleration control method and the look-ahead process of velocity planning in the interpolation stage. The control strategy of the contouring error mainly focuses on tracking error control, cross-coupling control, and optimal control. In order to improve the motion smoothness and contouring precision for multi-axis high-speed CNC machine tools, a multi-axis modified generalized predictive control approach was presented in this paper. In the control strategy, the estimation models of tracking error, contouring error, velocity error, and acceleration error were structured separately. A new improved quadratic performance index was proposed to guarantee the minimum of these errors. Generalize predictive control was also introduced, a multi-axis generalized predictive control model was deduced for motion smoothness and machining precision for multi-axis coordinated motion CNC system, and an approved multi-axis generalized predictive controller based on the model was designed in this paper. The proposed predicted control approach was evaluated by simulation and experiment of circular, noncircular, and space line trajectories, respectively. These simulative and experimental results demonstrated that the proposed control strategy can significantly improve the motion smoothness and contouring precision. Therefore, the new position control method can be used for the servo control system of multi-axis coordinated motion CNC system, which increases motion smoothness and machining precision of CNC machine tools. 相似文献
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李贵红 《机电产品开发与创新》2011,24(5):178-179
对于数控加工中参数曲线的加工,提出了一种新的插补算法,该算法利用泰勒展开对曲线方程进行重构,引入误差补偿思想,对插补过程中产生的误差反复补偿,从而满足目标要求,通过仿真和实际切削实验,表明该算法简单实用、通用性强、算法精度高,能够保证参数曲线的光滑性,有利于提高参数曲线加工质量和加工效率. 相似文献
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一阶、二阶Taylor展开式求解NURBS曲线插补坐标点ui+1,存在计算量大、插补时间长等问题,该文提出了一种基于Newton-Rapson迭代法的NURBS插补算法。仿真和实验结果表明:该算法计算过程简单有效,具有可行性和实用性,可以减少插补计算量和插补时间,提高插补精度和加工效率,满足了数控系统实时、高速、高效率插补的要求,对其他数控插补的过程具有很强的借鉴意义。 相似文献