The spin-exchange relaxation-free atomic gyroscope,with its exceptionally high theoretical precision,demonstrates immense potential to become the next-generation strategic-grade gyroscope.However,due to technological ...The spin-exchange relaxation-free atomic gyroscope,with its exceptionally high theoretical precision,demonstrates immense potential to become the next-generation strategic-grade gyroscope.However,due to technological noise,there is still a significant gap between its actual precision and theoretical precision.This study identifies the key factor limiting the precision of the SERF gyroscope as coupling noise.By optimizing the detection loop structure,a distinction between the dual-axis signals'response to optical and magnetic fields was achieved-where the optical errors responded similarly,while the response to magnetic noise was opposite.Based on the differences in the optical-magnetic response of the dual-axis signals,empirical mode decomposition was used to decompose the dual-axis gyroscope signals into multiple intrinsic mode functions,and Allan deviation analysis was applied to analyze the noise characteristics of the intrinsic mode functions over various periods.This study successfully reveals that optical errors caused by thermal-optical coupling and long-period magnetic noise induced by thermal-magnetic coupling are the dominant factors limiting the long-term stability of the SERF gyroscope.Based on these analyses,the study concludes that to achieve strategic-grade precision for the SERF gyroscope,it is essential to effectively address the noise issues caused by multi-physical field couplings.展开更多
A new control strategy named adjacent coupling error strategy is proposed to multi-motor drive system. The adjacent coupling error control scheme is developed considering the tracking speed error in one motor and the ...A new control strategy named adjacent coupling error strategy is proposed to multi-motor drive system. The adjacent coupling error control scheme is developed considering the tracking speed error in one motor and the synchronous error among adjacent motors simultaneously. In the strategy, due to non-linear effects of the two mentioned errors to the motion control of motor i, an adaptive fuzzy logic controller is designed to decide the control variable of the motor drive system. The multi-motor drive system is modeled and simulated by SIMULINK. The simulated researches show that the proposed strategy improves the synchronization, stabilization, and convergence of the multi-motor system.展开更多
架空输电线路断股修复机器人的作业过程包括线上行走、爬坡、越障等阶段,对机器人动力驱动的同步控制有较高要求。为此本文提出一种基于模型预测控制(model predictive control,MPC)–扩张状态观测器(extended state observer,ESO)的断...架空输电线路断股修复机器人的作业过程包括线上行走、爬坡、越障等阶段,对机器人动力驱动的同步控制有较高要求。为此本文提出一种基于模型预测控制(model predictive control,MPC)–扩张状态观测器(extended state observer,ESO)的断股修复机器人双轮行走同步控制方法。首先,对断股修复机器人挂线行走作业工况进行力学分析,设计挂线行走机械结构,增加作业稳定性与安全性;其次,针对双驱动轮因磨损、轮径不一致导致的线速度同步误差问题,提出一种基于MPC-ESO的主从融合偏差耦合线速度同步控制策略。仿真与实物验证表明,所提出的机器人双驱动轮同步控制方法可有效解决双驱动轮线速度不同步及机器人高空作业受扰问题。展开更多
基金supported by Hefei National Laboratory,Innovation Program for Quantum Science and Technology(2021ZD0300400/2021ZD0300402)the Beijing Natural Science Foundation(3252013)the China Postdoctoral Science Foundation(2024T171116).
文摘The spin-exchange relaxation-free atomic gyroscope,with its exceptionally high theoretical precision,demonstrates immense potential to become the next-generation strategic-grade gyroscope.However,due to technological noise,there is still a significant gap between its actual precision and theoretical precision.This study identifies the key factor limiting the precision of the SERF gyroscope as coupling noise.By optimizing the detection loop structure,a distinction between the dual-axis signals'response to optical and magnetic fields was achieved-where the optical errors responded similarly,while the response to magnetic noise was opposite.Based on the differences in the optical-magnetic response of the dual-axis signals,empirical mode decomposition was used to decompose the dual-axis gyroscope signals into multiple intrinsic mode functions,and Allan deviation analysis was applied to analyze the noise characteristics of the intrinsic mode functions over various periods.This study successfully reveals that optical errors caused by thermal-optical coupling and long-period magnetic noise induced by thermal-magnetic coupling are the dominant factors limiting the long-term stability of the SERF gyroscope.Based on these analyses,the study concludes that to achieve strategic-grade precision for the SERF gyroscope,it is essential to effectively address the noise issues caused by multi-physical field couplings.
基金National Natural Science Foundation of China (No.60774023)
文摘A new control strategy named adjacent coupling error strategy is proposed to multi-motor drive system. The adjacent coupling error control scheme is developed considering the tracking speed error in one motor and the synchronous error among adjacent motors simultaneously. In the strategy, due to non-linear effects of the two mentioned errors to the motion control of motor i, an adaptive fuzzy logic controller is designed to decide the control variable of the motor drive system. The multi-motor drive system is modeled and simulated by SIMULINK. The simulated researches show that the proposed strategy improves the synchronization, stabilization, and convergence of the multi-motor system.
文摘架空输电线路断股修复机器人的作业过程包括线上行走、爬坡、越障等阶段,对机器人动力驱动的同步控制有较高要求。为此本文提出一种基于模型预测控制(model predictive control,MPC)–扩张状态观测器(extended state observer,ESO)的断股修复机器人双轮行走同步控制方法。首先,对断股修复机器人挂线行走作业工况进行力学分析,设计挂线行走机械结构,增加作业稳定性与安全性;其次,针对双驱动轮因磨损、轮径不一致导致的线速度同步误差问题,提出一种基于MPC-ESO的主从融合偏差耦合线速度同步控制策略。仿真与实物验证表明,所提出的机器人双驱动轮同步控制方法可有效解决双驱动轮线速度不同步及机器人高空作业受扰问题。
