High precision position control and high speed control of the robot manipulators are fundamental and important control problems. The effectiveness of finite-time P-PI control was confirmed by end-effector position con...High precision position control and high speed control of the robot manipulators are fundamental and important control problems. The effectiveness of finite-time P-PI control was confirmed by end-effector position control of robot manipulators. However, parameter tuning method has not been proposed to finite-time P-PI control. In this paper, we propose a settling time design method and a parameter tuning method for the finite-time P-PI control. The effectiveness of the proposed parameter tuning method is confirmed by experiments of end-effcctor position control of a robot manipulator.展开更多
This paper investigates the consensus control of multi-agent systems(MASs) with constrained input using the dynamic event-triggered mechanism(ETM).Consider the MASs with small-scale networks where a centralized dynami...This paper investigates the consensus control of multi-agent systems(MASs) with constrained input using the dynamic event-triggered mechanism(ETM).Consider the MASs with small-scale networks where a centralized dynamic ETM with global information of the MASs is first designed.Then,a distributed dynamic ETM which only uses local information is developed for the MASs with large-scale networks.It is shown that the semi-global consensus of the MASs can be achieved by the designed bounded control protocol where the Zeno phenomenon is eliminated by a designable minimum inter-event time.In addition,it is easier to find a trade-off between the convergence rate and the minimum inter-event time by an adjustable parameter.Furthermore,the results are extended to regional consensus of the MASs with the bounded control protocol.Numerical simulations show the effectiveness of the proposed approach.展开更多
1 Active Disturbance Rejection Control(ADRC):a brief survey Since its inception,Active Disturbance Rejection Control(ADRC)has re-centered feedback controller design around two fundamental ideas—along with a consequen...1 Active Disturbance Rejection Control(ADRC):a brief survey Since its inception,Active Disturbance Rejection Control(ADRC)has re-centered feedback controller design around two fundamental ideas—along with a consequential design simplification:real-time estimation and online cancellation of the“total disturbance”conceived as the lumped effect of unknown internal dynamics and external inputs.The simplified design then proceeds in a customary fashion for the ideally remaining system model,which is devoid of the total disturbance.展开更多
This paper presents a robust adaptive state feedback control scheme for a class of parametric-strict-feedback nonlinear systems in the presence of time varying actuator failures. The designed adaptive controller compe...This paper presents a robust adaptive state feedback control scheme for a class of parametric-strict-feedback nonlinear systems in the presence of time varying actuator failures. The designed adaptive controller compensates a general class of actuator failures without any need for explicit fault detection. The parameters, times, and patterns of the considered failures are completely unknown. The proposed controller is constructed based on a backstepping design method. The global boundedness of all the closed-loop signals is guaranteed and the tracking error is proved to converge to a small neighborhood of the origin. The proposed approach is employed for a two-axis positioning stage system as well as an aircraft wing system. The simulation results show the correctness and effectiveness of the proposed robust adaptive actuator failure compensation approach.展开更多
In the field of optical interconnecting network and in super fast photonic computing system, the tree architecture and optical nonlinear materials can play a significant role. Nonlinear optical material may find impor...In the field of optical interconnecting network and in super fast photonic computing system, the tree architecture and optical nonlinear materials can play a significant role. Nonlinear optical material may find important uses in optical switching. Optical switch using nonlinear material makes it possible for one optical signal to control and switch another optical signal through nonlinear interaction in a material. In this communication such materials have been successfully exploited to design an all-optical tree-net architecture, which can be utilized for time division multiplexing scheme in all-optical domain.展开更多
Introduction Climate change is intensifying extreme heat events,positioning heat-related illness as an escalating public health threat.However,multiprovincial,individual-level evidence quantifying the association betw...Introduction Climate change is intensifying extreme heat events,positioning heat-related illness as an escalating public health threat.However,multiprovincial,individual-level evidence quantifying the association between elevated temperatures and heatrelated illness in China remains limited.Methods This multi-provincial study employed a time-stratified case-crossover design.Individual heatrelated illness case data(2013–2022)were obtained from the Heat-related Illness Report System,which collects reports from local healthcare facilities and CDCs across 11 provincial-level administrative divisions(PLADs).We evaluated associations between daily mean and maximum temperatures and heatrelated illness risk across multiple lag periods(lag0 to lag07),with lag01 designated a priori as the primary exposure window.Effect estimates are presented as relative risks(RR)and percentage changes in RR per 1℃ temperature increase.Subgroup analyses examined potential effect modification by sex,age,heat-related illness subtype,heat intensity,and geographic location.Results Between 2013 and 2022,53,061 heatrelated illness cases were recorded across study areas,with annual counts rising throughout the decade and reaching a peak of 14,025 in 2022.Although mild cases predominated each year(maximum 83.0%in 2015),the proportion of severe cases exhibited a concerning gradual increase.Regarding temperature associations,each 1℃ increase in daily mean temperature corresponded to a 21.03%(95%CI:20.59,21.47)elevation in the RR of heat-related illness.Daily maximum temperature demonstrated a comparable pattern,though risk estimates were marginally lower.Conclusion This study demonstrates a clear upward trend in heat-related illness incidence linked to climate change and confirms that elevated temperatures significantly increase disease risk.The escalating health burden necessitates urgent development and implementation of targeted heat-health action plans to protect vulnerable populations.展开更多
文摘High precision position control and high speed control of the robot manipulators are fundamental and important control problems. The effectiveness of finite-time P-PI control was confirmed by end-effector position control of robot manipulators. However, parameter tuning method has not been proposed to finite-time P-PI control. In this paper, we propose a settling time design method and a parameter tuning method for the finite-time P-PI control. The effectiveness of the proposed parameter tuning method is confirmed by experiments of end-effcctor position control of a robot manipulator.
基金supported in part by the National Natural Science Foundation of China(51939001,61976033,62273072)the Natural Science Foundation of Sichuan Province (2022NSFSC0903)。
文摘This paper investigates the consensus control of multi-agent systems(MASs) with constrained input using the dynamic event-triggered mechanism(ETM).Consider the MASs with small-scale networks where a centralized dynamic ETM with global information of the MASs is first designed.Then,a distributed dynamic ETM which only uses local information is developed for the MASs with large-scale networks.It is shown that the semi-global consensus of the MASs can be achieved by the designed bounded control protocol where the Zeno phenomenon is eliminated by a designable minimum inter-event time.In addition,it is easier to find a trade-off between the convergence rate and the minimum inter-event time by an adjustable parameter.Furthermore,the results are extended to regional consensus of the MASs with the bounded control protocol.Numerical simulations show the effectiveness of the proposed approach.
文摘1 Active Disturbance Rejection Control(ADRC):a brief survey Since its inception,Active Disturbance Rejection Control(ADRC)has re-centered feedback controller design around two fundamental ideas—along with a consequential design simplification:real-time estimation and online cancellation of the“total disturbance”conceived as the lumped effect of unknown internal dynamics and external inputs.The simplified design then proceeds in a customary fashion for the ideally remaining system model,which is devoid of the total disturbance.
基金supported by Esfahan Regional Electric Company(EREC)
文摘This paper presents a robust adaptive state feedback control scheme for a class of parametric-strict-feedback nonlinear systems in the presence of time varying actuator failures. The designed adaptive controller compensates a general class of actuator failures without any need for explicit fault detection. The parameters, times, and patterns of the considered failures are completely unknown. The proposed controller is constructed based on a backstepping design method. The global boundedness of all the closed-loop signals is guaranteed and the tracking error is proved to converge to a small neighborhood of the origin. The proposed approach is employed for a two-axis positioning stage system as well as an aircraft wing system. The simulation results show the correctness and effectiveness of the proposed robust adaptive actuator failure compensation approach.
文摘In the field of optical interconnecting network and in super fast photonic computing system, the tree architecture and optical nonlinear materials can play a significant role. Nonlinear optical material may find important uses in optical switching. Optical switch using nonlinear material makes it possible for one optical signal to control and switch another optical signal through nonlinear interaction in a material. In this communication such materials have been successfully exploited to design an all-optical tree-net architecture, which can be utilized for time division multiplexing scheme in all-optical domain.
基金Supported by the Major Project of Guangzhou National Laboratory(No.GZNL2024A01025)the National Natural Science Foundation of China(Grant No.52272340).
文摘Introduction Climate change is intensifying extreme heat events,positioning heat-related illness as an escalating public health threat.However,multiprovincial,individual-level evidence quantifying the association between elevated temperatures and heatrelated illness in China remains limited.Methods This multi-provincial study employed a time-stratified case-crossover design.Individual heatrelated illness case data(2013–2022)were obtained from the Heat-related Illness Report System,which collects reports from local healthcare facilities and CDCs across 11 provincial-level administrative divisions(PLADs).We evaluated associations between daily mean and maximum temperatures and heatrelated illness risk across multiple lag periods(lag0 to lag07),with lag01 designated a priori as the primary exposure window.Effect estimates are presented as relative risks(RR)and percentage changes in RR per 1℃ temperature increase.Subgroup analyses examined potential effect modification by sex,age,heat-related illness subtype,heat intensity,and geographic location.Results Between 2013 and 2022,53,061 heatrelated illness cases were recorded across study areas,with annual counts rising throughout the decade and reaching a peak of 14,025 in 2022.Although mild cases predominated each year(maximum 83.0%in 2015),the proportion of severe cases exhibited a concerning gradual increase.Regarding temperature associations,each 1℃ increase in daily mean temperature corresponded to a 21.03%(95%CI:20.59,21.47)elevation in the RR of heat-related illness.Daily maximum temperature demonstrated a comparable pattern,though risk estimates were marginally lower.Conclusion This study demonstrates a clear upward trend in heat-related illness incidence linked to climate change and confirms that elevated temperatures significantly increase disease risk.The escalating health burden necessitates urgent development and implementation of targeted heat-health action plans to protect vulnerable populations.
