Based on Lyapunov stability theory, an adaptive controller is designed for a class of chaotic systems. Globally exponential synchronization and parameter regulation for couple chaotic systems can be carried out simult...Based on Lyapunov stability theory, an adaptive controller is designed for a class of chaotic systems. Globally exponential synchronization and parameter regulation for couple chaotic systems can be carried out simultaneously. The controller and the regulating law of parameters are directly constructed by analytic formula. Simulation results with some chaotic systems show the effectiveness of the proposed controller.展开更多
Dual three-phase Permanent Magnet Synchronous Motor(DTP-PMSM)is a nonlinear,strongly coupled,high-order multivariable system.In today’s application scenarios,it is difficult for traditional PI controllers to meet the...Dual three-phase Permanent Magnet Synchronous Motor(DTP-PMSM)is a nonlinear,strongly coupled,high-order multivariable system.In today’s application scenarios,it is difficult for traditional PI controllers to meet the requirements of fast response,high accuracy and good robustness.In order to improve the performance of DTP-PMSM speed regulation system,a control strategy of PI controller based on genetic algorithm is proposed.Firstly,the basic mathematical model of DTP-PMSM is established,and the PI parameters of DTP-PMSM speed regulation system are optimized by genetic algorithm,and the modeling and simulation experiments of DTP-PMSM control system are carried out by MATLAB/SIMULINK.The simulation results show that,compared with the traditional PI control,the proposed algorithm significantly improves the performance of the control system,and the speed output overshoot of the GA-PI speed control system is smaller.The anti-interference ability is stronger,and the torque and double three-phase current output fluctuations are smaller.展开更多
为明确淡紫拟青霉PL-HN-16促进植物生长的活性因子。采用Salkowski比色法、胚芽鞘法和高效液相色谱(HPLC)分析培养物中生长素(IAA);离子柱层析和生物活性跟踪法,明确其促植物生长活性因子。Salkowski比色、小麦胚芽鞘试验和HPLC试验结...为明确淡紫拟青霉PL-HN-16促进植物生长的活性因子。采用Salkowski比色法、胚芽鞘法和高效液相色谱(HPLC)分析培养物中生长素(IAA);离子柱层析和生物活性跟踪法,明确其促植物生长活性因子。Salkowski比色、小麦胚芽鞘试验和HPLC试验结果表明:PL-HN-16不产生IAA;柱层析和活性跟踪结果表明,其促生长活性因子为分子量约14 k Da的蛋白,当蛋白浓度低于0.10μg/m L时,促生长作用呈明显剂量相关性,对菜心生长促进率达13.15%,高于0.10μg/m L抑制菜心生长。PL-HN-16促植物生长因子为分子量约14 k Da的蛋白,有关植物外源激素样功能蛋白研究鲜有报道,开展其研究具有理论和应用价值。展开更多
该文针对多源时变干扰影响的双三相永磁同步电机系统,研究其基波平面内的调速控制问题和谐波平面内的谐波电流抑制问题。首先,在基波平面采用非串级控制结构,通过构造广义比例积分观测器(generalized proportional integral observer,GP...该文针对多源时变干扰影响的双三相永磁同步电机系统,研究其基波平面内的调速控制问题和谐波平面内的谐波电流抑制问题。首先,在基波平面采用非串级控制结构,通过构造广义比例积分观测器(generalized proportional integral observer,GPIO)估计转速环的多源快变干扰;然后,针对q轴电流的过流保护问题,在传统比例微分反馈控制器的基础上利用障碍函数设计思想,结合干扰估计信息,得到基于GPIO的电流约束复合控制器;其次,在谐波平面,通过设计2个GPIO精准估计电流环的多源快变干扰,并与比例反馈控制器结合形成复合控制器来抑制2个电流环中的谐波电流。最后,给出严谨的稳定性分析,并通过对比实验验证所提方法的有效性。展开更多
基金Supported by the National Natural Science Foundation of China (No. 60474011) Foundation of Yong Bone Teacher of Henan Province (No. 2004240).
文摘Based on Lyapunov stability theory, an adaptive controller is designed for a class of chaotic systems. Globally exponential synchronization and parameter regulation for couple chaotic systems can be carried out simultaneously. The controller and the regulating law of parameters are directly constructed by analytic formula. Simulation results with some chaotic systems show the effectiveness of the proposed controller.
基金supported in part by the Liaoning Provincial Department of Education Key Research Project under JYT2020160by the Liaoning Provincial Department of Education General Project under LJKZ0224。
文摘Dual three-phase Permanent Magnet Synchronous Motor(DTP-PMSM)is a nonlinear,strongly coupled,high-order multivariable system.In today’s application scenarios,it is difficult for traditional PI controllers to meet the requirements of fast response,high accuracy and good robustness.In order to improve the performance of DTP-PMSM speed regulation system,a control strategy of PI controller based on genetic algorithm is proposed.Firstly,the basic mathematical model of DTP-PMSM is established,and the PI parameters of DTP-PMSM speed regulation system are optimized by genetic algorithm,and the modeling and simulation experiments of DTP-PMSM control system are carried out by MATLAB/SIMULINK.The simulation results show that,compared with the traditional PI control,the proposed algorithm significantly improves the performance of the control system,and the speed output overshoot of the GA-PI speed control system is smaller.The anti-interference ability is stronger,and the torque and double three-phase current output fluctuations are smaller.
文摘为明确淡紫拟青霉PL-HN-16促进植物生长的活性因子。采用Salkowski比色法、胚芽鞘法和高效液相色谱(HPLC)分析培养物中生长素(IAA);离子柱层析和生物活性跟踪法,明确其促植物生长活性因子。Salkowski比色、小麦胚芽鞘试验和HPLC试验结果表明:PL-HN-16不产生IAA;柱层析和活性跟踪结果表明,其促生长活性因子为分子量约14 k Da的蛋白,当蛋白浓度低于0.10μg/m L时,促生长作用呈明显剂量相关性,对菜心生长促进率达13.15%,高于0.10μg/m L抑制菜心生长。PL-HN-16促植物生长因子为分子量约14 k Da的蛋白,有关植物外源激素样功能蛋白研究鲜有报道,开展其研究具有理论和应用价值。
文摘该文针对多源时变干扰影响的双三相永磁同步电机系统,研究其基波平面内的调速控制问题和谐波平面内的谐波电流抑制问题。首先,在基波平面采用非串级控制结构,通过构造广义比例积分观测器(generalized proportional integral observer,GPIO)估计转速环的多源快变干扰;然后,针对q轴电流的过流保护问题,在传统比例微分反馈控制器的基础上利用障碍函数设计思想,结合干扰估计信息,得到基于GPIO的电流约束复合控制器;其次,在谐波平面,通过设计2个GPIO精准估计电流环的多源快变干扰,并与比例反馈控制器结合形成复合控制器来抑制2个电流环中的谐波电流。最后,给出严谨的稳定性分析,并通过对比实验验证所提方法的有效性。
