The Experts below are selected from a list of 2649 Experts worldwide ranked by ideXlab platform

Zexiang Li - One of the best experts on this subject based on the ideXlab platform.

  • a novel contour error estimation for Position Loop based cross coupled control
    IEEE-ASME Transactions on Mechatronics, 2011
    Co-Authors: Jiangzhao Yang, Zexiang Li
    Abstract:

    Reduction of contour error is the main control objective in contour-following applications. A common approach to this objective is to design a controller based on the contour error directly. In this case, the contour error estimation is a key factor in the contour-following operation. Contour error can be approximated by the linear distance from the actual Position to the tangent line or plane at the desired Position. This approach suffers from a significant error due to linear approximation. A novel approach to contour error calculation of an arbitrary smooth path is proposed in this paper. The proposed method is based on coordinate transformation and circular approximation. In this method, the contour error is represented by the coordinate of the actual Position with respect to a specific virtual coordinate frame. The method is incorporated in a Position Loop-based cross-coupled control structure. An equivalent robust control system is used to establish stability of the closed-Loop system. Experimental results demonstrate the efficiency and performance of the proposed contour error estimation algorithm and the motion control strategy.

  • Position Loop-based cross-coupled control for high-speed machining
    2008 7th World Congress on Intelligent Control and Automation, 2008
    Co-Authors: Jiangzhao Yang, Dongjun Zhang, Zexiang Li
    Abstract:

    Recent work recognizes that cross-coupled control (CCC) can improve the accuracy of contour tracking in biaxial systems evidently. In this paper, a structure, ejecting the cross compensated control effort into the Position input directly, is proposed. In order to obtain the cross-coupling gains, an approach for contour error approximation to arbitrary regular curve is set up. Furthermore, it turns to deal with an equivalent robust system when analyze the stability of the proposed CCC structure. The experimental results indicate that the contouring error is reduced by half when the introduced structure is applied.

V. Dukovski - One of the best experts on this subject based on the ideXlab platform.

  • Analytical Determination of the CNC Machines High-Speed Feed Drives Position Loop Gain
    Applied Mechanics and Materials, 2014
    Co-Authors: Z. Pandilov, V. Dukovski
    Abstract:

    One of the most important factors which influence on the dynamical behavior of the high-speed feed drives for CNC machines is Position Loop gain or Kv factor. It directly influences the contouring accuracy of the CNC machines. Usually Position Loop gain is experimentally tuned on the already assembled CNC machines. This paper gives one approach towards its analytical calculation. The difference between analytical calculated and experimentally obtained Kv-factor is smaller than 5%, which is completely acceptable.

  • Improving the HSC Linear Motor Milling Machine Contouring Accuracy
    Key Engineering Materials, 2013
    Co-Authors: Z. Pandilov, V. Dukovski
    Abstract:

    In recent years, instrumentation circular profile tests have been specified to assess the contouring accuracy of CNC machine tools. Such an instrumentation type test is the HEIDENHAIN grid encoder system, which is particularly appropriate for dynamic measurements, especially at high feed rates. In this paper influence of the Position Loop gain and sampling period on the contouring accuracy are effectively studied. ? (2014) Trans Tech Publications, Switzerland.

  • Analytical Calculation of the Position Loop Gain for Linear Motor CNC Machine Tool
    Applied Mechanics and Materials, 2012
    Co-Authors: Z. Pandilov, V. Dukovski
    Abstract:

    One of the most important factors which influence on the dynamical behavior of the linear motor servo drives for CNC machine tools is Position Loop gain or Kv factor. From the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the following errors along the different axes may cause form deviations of the machined contours. Generally Position Loop gain Kv should be high for faster system response and higher accuracy, but the maximum gains allowable are limited due to undesirable oscillatory responses at high gains and low damping factor. Usually Kv factor is experimentally tuned on the already assembled machine tool. This paper presents a simple method for analytically calculation of the Position Loop gain Kv. A combined digital-analog model of the 4-th order of the Position Loop is presented. In order to ease the calculation, the 4-th order system is simplified with a second order model. With this approach it is very easy to calculate the Kv factor for necessary Position Loop damping. The difference of the replacement of the 4-th order system with second order system is presented with the simulation program MATLAB. Analytically calculated Kv factor is function of the nominal angular frequency  and damping D of the linear motor servo drive electrical parts (motor and regulator), as well as sampling period T. :The influence of nonlinearities was taken with the correction factor. Our investigations have proven that experimentally tuned Kv factor differs from analytically calculated Kv factor less than 10%, which is completely acceptable

  • Analytical calculation of the Position Loop gain for linear motor CNC machine tool
    Applied Mechanics and Materials, 2012
    Co-Authors: Z. Pandilov, V. Dukovski
    Abstract:

    One of the most important factors which influence on the dynamical behavior of the linear motor servo drives for CNC machine tools is Position Loop gain or Kv factor. From the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the following errors along the different axes may cause form deviations of the machined contours. Generally Position Loop gain Kv should be high for faster system response and higher accuracy, but the maximum gains allowable are limited due to undesirable oscillatory responses at high gains and low damping factor. Usually Kv factor is experimentally tuned on the already assembled machine tool. This paper presents a simple method for analytically calculation of the Position Loop gain Kv. A combined digital-analog model of the 4-th order of the Position Loop is presented. In order to ease the calculation, the 4-th order system is simplified with a second order model. With this approach it is very easy to calculate the Kv factor for necessary Position Loop damping. The difference of the replacement of the 4-th order system with second order system is presented with the simulation program MATLAB. Analytically calculated Kv factor is function of the nominal angular frequency ? and damping D of the linear motor servo drive electrical parts (motor and regulator), as well as sampling period T. The influence of nonlinearities was taken with the correction factor. Our investigations have proven that experimentally tuned Kv factor differs from analytically calculated Kv factor less than 10%, which is completely acceptable. ? (2012) Trans Tech Publications, Switzerland.

  • The multi-scale FEM simulation of the drawing processes of high carbon steel
    Journal of achievements in materials and manufacturing engineering, 2007
    Co-Authors: Z. Pandilov, V. Dukovski
    Abstract:

    Purpose: One of the most important factors which influence on the dynamical behavior of the feed drives for CNC machine tools is Position Loop gain or Kv factor. Design/methodology/approach: From the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the following errors along the different axes may cause form deviations of the machined contours. Generally Position Loop gain Kv should be high for faster system response and higher accuracy, but the maximum gains allowable are limited due to undesirable oscillatory responses at high gains and low damping factor. Usually Kv factor is experimentally tuned on the already assembled machine tool. Findings: This paper presents a simple method for analytically calculation of the Position Loop gain Kv. A combined digital-analog model of the 6-th order of the Position Loop is presented. In order to ease the calculation, the 6-th order system is simplified with a second order model. With this approach it is very easy to calculate the Kv factor for necessary Position Loop damping. The difference of the replacement of the 6-th order system with second order system is presented with the simulation program MATLAB. Analytically calculated Kv factor is function of the nominal angular frequency ωe and damping De of the feed drive electrical parts (motor and regulator), nominal angular frequency ωm and damping Dm of the mechanical transmission elements, as well as sampling period T. Research limitations/implications: The influence of nonlinearities was taken with the correction factor. Originality/value: Our investigations have proven that experimentally tuned Kv factor differs from analytically calculated Kv factor only 10%, which is completely acceptable.

Jiangzhao Yang - One of the best experts on this subject based on the ideXlab platform.

  • a novel contour error estimation for Position Loop based cross coupled control
    IEEE-ASME Transactions on Mechatronics, 2011
    Co-Authors: Jiangzhao Yang, Zexiang Li
    Abstract:

    Reduction of contour error is the main control objective in contour-following applications. A common approach to this objective is to design a controller based on the contour error directly. In this case, the contour error estimation is a key factor in the contour-following operation. Contour error can be approximated by the linear distance from the actual Position to the tangent line or plane at the desired Position. This approach suffers from a significant error due to linear approximation. A novel approach to contour error calculation of an arbitrary smooth path is proposed in this paper. The proposed method is based on coordinate transformation and circular approximation. In this method, the contour error is represented by the coordinate of the actual Position with respect to a specific virtual coordinate frame. The method is incorporated in a Position Loop-based cross-coupled control structure. An equivalent robust control system is used to establish stability of the closed-Loop system. Experimental results demonstrate the efficiency and performance of the proposed contour error estimation algorithm and the motion control strategy.

  • Position Loop-based cross-coupled control for high-speed machining
    2008 7th World Congress on Intelligent Control and Automation, 2008
    Co-Authors: Jiangzhao Yang, Dongjun Zhang, Zexiang Li
    Abstract:

    Recent work recognizes that cross-coupled control (CCC) can improve the accuracy of contour tracking in biaxial systems evidently. In this paper, a structure, ejecting the cross compensated control effort into the Position input directly, is proposed. In order to obtain the cross-coupling gains, an approach for contour error approximation to arbitrary regular curve is set up. Furthermore, it turns to deal with an equivalent robust system when analyze the stability of the proposed CCC structure. The experimental results indicate that the contouring error is reduced by half when the introduced structure is applied.

Z. Pandilov - One of the best experts on this subject based on the ideXlab platform.

  • Analytical Determination of the CNC Machines High-Speed Feed Drives Position Loop Gain
    Applied Mechanics and Materials, 2014
    Co-Authors: Z. Pandilov, V. Dukovski
    Abstract:

    One of the most important factors which influence on the dynamical behavior of the high-speed feed drives for CNC machines is Position Loop gain or Kv factor. It directly influences the contouring accuracy of the CNC machines. Usually Position Loop gain is experimentally tuned on the already assembled CNC machines. This paper gives one approach towards its analytical calculation. The difference between analytical calculated and experimentally obtained Kv-factor is smaller than 5%, which is completely acceptable.

  • Improving the HSC Linear Motor Milling Machine Contouring Accuracy
    Key Engineering Materials, 2013
    Co-Authors: Z. Pandilov, V. Dukovski
    Abstract:

    In recent years, instrumentation circular profile tests have been specified to assess the contouring accuracy of CNC machine tools. Such an instrumentation type test is the HEIDENHAIN grid encoder system, which is particularly appropriate for dynamic measurements, especially at high feed rates. In this paper influence of the Position Loop gain and sampling period on the contouring accuracy are effectively studied. ? (2014) Trans Tech Publications, Switzerland.

  • Analytical Calculation of the Position Loop Gain for Linear Motor CNC Machine Tool
    Applied Mechanics and Materials, 2012
    Co-Authors: Z. Pandilov, V. Dukovski
    Abstract:

    One of the most important factors which influence on the dynamical behavior of the linear motor servo drives for CNC machine tools is Position Loop gain or Kv factor. From the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the following errors along the different axes may cause form deviations of the machined contours. Generally Position Loop gain Kv should be high for faster system response and higher accuracy, but the maximum gains allowable are limited due to undesirable oscillatory responses at high gains and low damping factor. Usually Kv factor is experimentally tuned on the already assembled machine tool. This paper presents a simple method for analytically calculation of the Position Loop gain Kv. A combined digital-analog model of the 4-th order of the Position Loop is presented. In order to ease the calculation, the 4-th order system is simplified with a second order model. With this approach it is very easy to calculate the Kv factor for necessary Position Loop damping. The difference of the replacement of the 4-th order system with second order system is presented with the simulation program MATLAB. Analytically calculated Kv factor is function of the nominal angular frequency  and damping D of the linear motor servo drive electrical parts (motor and regulator), as well as sampling period T. :The influence of nonlinearities was taken with the correction factor. Our investigations have proven that experimentally tuned Kv factor differs from analytically calculated Kv factor less than 10%, which is completely acceptable

  • Analytical calculation of the Position Loop gain for linear motor CNC machine tool
    Applied Mechanics and Materials, 2012
    Co-Authors: Z. Pandilov, V. Dukovski
    Abstract:

    One of the most important factors which influence on the dynamical behavior of the linear motor servo drives for CNC machine tools is Position Loop gain or Kv factor. From the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the following errors along the different axes may cause form deviations of the machined contours. Generally Position Loop gain Kv should be high for faster system response and higher accuracy, but the maximum gains allowable are limited due to undesirable oscillatory responses at high gains and low damping factor. Usually Kv factor is experimentally tuned on the already assembled machine tool. This paper presents a simple method for analytically calculation of the Position Loop gain Kv. A combined digital-analog model of the 4-th order of the Position Loop is presented. In order to ease the calculation, the 4-th order system is simplified with a second order model. With this approach it is very easy to calculate the Kv factor for necessary Position Loop damping. The difference of the replacement of the 4-th order system with second order system is presented with the simulation program MATLAB. Analytically calculated Kv factor is function of the nominal angular frequency ? and damping D of the linear motor servo drive electrical parts (motor and regulator), as well as sampling period T. The influence of nonlinearities was taken with the correction factor. Our investigations have proven that experimentally tuned Kv factor differs from analytically calculated Kv factor less than 10%, which is completely acceptable. ? (2012) Trans Tech Publications, Switzerland.

  • The multi-scale FEM simulation of the drawing processes of high carbon steel
    Journal of achievements in materials and manufacturing engineering, 2007
    Co-Authors: Z. Pandilov, V. Dukovski
    Abstract:

    Purpose: One of the most important factors which influence on the dynamical behavior of the feed drives for CNC machine tools is Position Loop gain or Kv factor. Design/methodology/approach: From the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the following errors along the different axes may cause form deviations of the machined contours. Generally Position Loop gain Kv should be high for faster system response and higher accuracy, but the maximum gains allowable are limited due to undesirable oscillatory responses at high gains and low damping factor. Usually Kv factor is experimentally tuned on the already assembled machine tool. Findings: This paper presents a simple method for analytically calculation of the Position Loop gain Kv. A combined digital-analog model of the 6-th order of the Position Loop is presented. In order to ease the calculation, the 6-th order system is simplified with a second order model. With this approach it is very easy to calculate the Kv factor for necessary Position Loop damping. The difference of the replacement of the 6-th order system with second order system is presented with the simulation program MATLAB. Analytically calculated Kv factor is function of the nominal angular frequency ωe and damping De of the feed drive electrical parts (motor and regulator), nominal angular frequency ωm and damping Dm of the mechanical transmission elements, as well as sampling period T. Research limitations/implications: The influence of nonlinearities was taken with the correction factor. Originality/value: Our investigations have proven that experimentally tuned Kv factor differs from analytically calculated Kv factor only 10%, which is completely acceptable.

Huajun Wang - One of the best experts on this subject based on the ideXlab platform.

  • DSP control implement of Permanent Magnet Synchronous AC servo motor based on vector control
    2009 International Conference on Mechatronics and Automation, 2009
    Co-Authors: Huajun Wang
    Abstract:

    At present, Permanent Magnet Synchronous Motor (PMSM) AC servo system based on vector control has attracted more and more attentions and the research on it must be a kind of inevitable development trend and focus in the future. This paper is based on DSP TMS320F2812, which is designed for special-purpose on motor control by TI Company, and designs a set of hardware control system for PMSM. The software is written by C2000 assembly language, which realized the speed, current and Position Loop control. The flow chart of interrupt service routine is available. The simulation results show the excellent performance of DSP control.