Shape is an important quality index of cold rolling strip. Up to now, many problems in the shape control domain have not been solved satisfactorily, and a review on the research progress in the shape control domain ca...Shape is an important quality index of cold rolling strip. Up to now, many problems in the shape control domain have not been solved satisfactorily, and a review on the research progress in the shape control domain can help to seek new breakthrough directions. In the past 10 years, researches and applications of shape control models, shape control means, shape detection technology, and shape con- trol system have achieved significant progress. In the aspect of shape control models, the researches in the past improve the accuracy, speed and robustness of the models. The intelligentization of shape control models should be strengthened in the future. In the aspect of the shape control means, the researches in the past focus on the roll opti- mization, mill type selection, process optimization, local strip shape control, edge drop control, and so on. In the future, more attention should be paid to the coordination control of both strip shape and other quality indexes, and the refinement of control objective should be strengthened. In the aspects of shape detection technology and shape control system, some new types of shape detection meters and shape control systems are developed and have successfully indus- trial applications. In the future, the standardization of shape detection technology and shape control system should be promoted to solve the problem of compatibility. In general,the four expected development trends of shape control for cold roiling strip in the future are intelligentization, coordi- nation, refinement, and standardization. The proposed research provides new breakthrough directions for improv- ing shape quality.展开更多
A hysteric model is represented to describe the dependence of restoring force on deformation of pseudoelastic SMA.The dynamic response of the system is investigated by means of mathematical models.The result shows th...A hysteric model is represented to describe the dependence of restoring force on deformation of pseudoelastic SMA.The dynamic response of the system is investigated by means of mathematical models.The result shows that this kind of vibration absorbing system can suppress vibration with large amplitude effectively.Furthermore,the vibration absorbing system can work in optimum state by adjusting temperature and using piezoelectric sensors and actuators.展开更多
This paper is concerned with the robust control synthesis of autonomous underwater vehicle （AUV） for general path following maneuvers. First, we present maneuvering kinematics and vehicle dynamics in a unified frame...This paper is concerned with the robust control synthesis of autonomous underwater vehicle （AUV） for general path following maneuvers. First, we present maneuvering kinematics and vehicle dynamics in a unified framework. Based on H∞ loop-shaping procedure, the 2-DOF autopilot controller has been presented to enhance stability and path tracking. By use of model reduction, the high-order control system is reduced to one with reasonable order, and further the scaled low-order controller has been analyzed in both the frequency and the time domains. Finally, it is shown that the autopilot control system provides robust performance and stability against prescribed levels of uncertainty.展开更多
研究了偏动式形状记忆合金(Shape Memory Alloy,SMA)驱动系统的非线性迟滞现象,并提出了一种基于扩展状态观测器(Extended State Observer,ESO)的自适应反步滑模控制方法,以实现驱动器精确位置跟踪。利用搭建的偏动式SMA驱动器,建立了基...研究了偏动式形状记忆合金(Shape Memory Alloy,SMA)驱动系统的非线性迟滞现象,并提出了一种基于扩展状态观测器(Extended State Observer,ESO)的自适应反步滑模控制方法,以实现驱动器精确位置跟踪。利用搭建的偏动式SMA驱动器,建立了基于SMA物理特性的驱动器数学模型。设计了ESO来估计和补偿系统的外部扰动,结合自适应反步滑模控制方法,实现了精确的驱动器位置跟踪。采用Lyapunov稳定性理论对控制方法进行了严格分析,以确保系统的稳定性。通过仿真优化了控制参数,并在实验平台上进行了跟踪实验和抗干扰实验。实验结果表明,相比传统的反步控制或滑模控制,所提方法在跟踪正弦时精度提高了6.8%以上,并且具有更好的抗干扰能力和鲁棒性,能够满足实际应用中的精度和可靠性要求。展开更多
基金Supported by National Key Technology Support Program of China (Grant No. 2011BAF15B00)Hebei Provincial Natural Science Foundation of China (Grant No. E2016203482)+1 种基金Hebei Provincial Science and Technology Research Foundation of China (Grant No. ZD2014034)Youth Independent Research Program of Yanshan University of China (Grant No. 14LGA003)
文摘Shape is an important quality index of cold rolling strip. Up to now, many problems in the shape control domain have not been solved satisfactorily, and a review on the research progress in the shape control domain can help to seek new breakthrough directions. In the past 10 years, researches and applications of shape control models, shape control means, shape detection technology, and shape con- trol system have achieved significant progress. In the aspect of shape control models, the researches in the past improve the accuracy, speed and robustness of the models. The intelligentization of shape control models should be strengthened in the future. In the aspect of the shape control means, the researches in the past focus on the roll opti- mization, mill type selection, process optimization, local strip shape control, edge drop control, and so on. In the future, more attention should be paid to the coordination control of both strip shape and other quality indexes, and the refinement of control objective should be strengthened. In the aspects of shape detection technology and shape control system, some new types of shape detection meters and shape control systems are developed and have successfully indus- trial applications. In the future, the standardization of shape detection technology and shape control system should be promoted to solve the problem of compatibility. In general,the four expected development trends of shape control for cold roiling strip in the future are intelligentization, coordi- nation, refinement, and standardization. The proposed research provides new breakthrough directions for improv- ing shape quality.
基金This project is supported by National Natural Science Foundation of China and the 21st Century Youth Foundation of Tianjin
文摘A hysteric model is represented to describe the dependence of restoring force on deformation of pseudoelastic SMA.The dynamic response of the system is investigated by means of mathematical models.The result shows that this kind of vibration absorbing system can suppress vibration with large amplitude effectively.Furthermore,the vibration absorbing system can work in optimum state by adjusting temperature and using piezoelectric sensors and actuators.
基金a part of the project titled "Development of Key Marine Equipments for Enhancement of Ocean Industry-Development of Underwater Manipulator and Thrusting System Driven by Electric Motor" funded by the Ministry of Land, Transport and Maritime Affairs, Korea
文摘This paper is concerned with the robust control synthesis of autonomous underwater vehicle （AUV） for general path following maneuvers. First, we present maneuvering kinematics and vehicle dynamics in a unified framework. Based on H∞ loop-shaping procedure, the 2-DOF autopilot controller has been presented to enhance stability and path tracking. By use of model reduction, the high-order control system is reduced to one with reasonable order, and further the scaled low-order controller has been analyzed in both the frequency and the time domains. Finally, it is shown that the autopilot control system provides robust performance and stability against prescribed levels of uncertainty.
文摘研究了偏动式形状记忆合金(Shape Memory Alloy,SMA)驱动系统的非线性迟滞现象,并提出了一种基于扩展状态观测器(Extended State Observer,ESO)的自适应反步滑模控制方法,以实现驱动器精确位置跟踪。利用搭建的偏动式SMA驱动器,建立了基于SMA物理特性的驱动器数学模型。设计了ESO来估计和补偿系统的外部扰动,结合自适应反步滑模控制方法,实现了精确的驱动器位置跟踪。采用Lyapunov稳定性理论对控制方法进行了严格分析,以确保系统的稳定性。通过仿真优化了控制参数,并在实验平台上进行了跟踪实验和抗干扰实验。实验结果表明,相比传统的反步控制或滑模控制,所提方法在跟踪正弦时精度提高了6.8%以上,并且具有更好的抗干扰能力和鲁棒性,能够满足实际应用中的精度和可靠性要求。
