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Gait Planning and Compliance control of a Biped Robot on Stairs with Desired ZMP

IFAC Proceedings Volumes 2014年第3期47卷 2165-2170页

作者： Guangrong Chen Junzheng Wang Lipeng Wang Key Laboratory of Intelligent Control and Decision of Complex System Beijing Institute of Technology Beijing CO 100081 P.R.China Beijing Institute of Technology Beijing CO 100081 P.R.China

For biped robot, friendly environment interaction makes sense. In this paper, a new method to plan the gait and control a biped robot on stairs with desired ZMP is proposed first. The desired ZMP derived from an iterative optimal algorithm not only has enough stability margin and satisfies actuator specifications, but also is available to implement and energy saving. Then, a controller with force sensing and variable impedance is proposed, which can sense and compensate the environmental disturbance well. Finally, the effectiveness of the proposed methods is confirmed by simulation examples.

关键词： Biped robot Gait planning Desired ZMP Compliance control

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Bipedal walking with toe-off, heel-strike and compliance with external disturbances

Bipedal walking with toe-off, heel-strike and compliance wit...

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IEEE-RAS International Conference on Humanoid Robots

作者： Xuechao Chen Yuhang Zhou Qiang Huang Zhangguo Yu Gan Ma Libo Meng Chenglong Fu Key Laboratory of Intelligent Control and Decision of Complex System China Ministry of Education Key Laboratory of Biomimetic Robots and Systems China Intelligent Robotics Institute Beijing Institute of Technology Beijing China Department of Mechanical Engineering Tsinghua University Beijing

ISBN: (纸本)9781479971756

Both disturbance rejection and human-like motions, like toe-off and heel-strike, are important for a biped robot to enhance its performance. However, the required motions for them may influence each other, which is why few studies consider them simultaneously. This paper presents a method to realize stable walking with toe-off and heel-strike even when the robot experiences disturbances. We propose a walking controller which can constrain the desired ground reaction force. On the one hand, the controller can adjust the torso acceleration to make the supporting leg compliant with the external disturbances on the torso. On the other hand, it can rotate the supporting foot by adjusting the ZMP to an appropriate location. The linear inverted pendulum is utilized to generate the CoM trajectory and the foot placement. Meanwhile, its ZMP can be predefined as required so that the toe-off and heel-strike can be achieved by the controller. The effectiveness of the proposed method is demonstrated by simulations.

关键词： Legged locomotion Foot Torso Robot kinematics Acceleration Joints

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Active disturbance rejection control for synchronization of different fractional-order chaotic systems

Active disturbance rejection control for synchronization of ...

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World Congress on intelligent control and Automation (WCICA)

作者： Zhe Gao Xiaozhong Liao College of Light Industry Liaoning University Shenyang Liaoning Province China Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing Institute of Technology Beijing China

This paper investigates the fractional-order active disturbance rejection control for the synchronization of two different fractional-order chaotic systems. By the fractional-order extended state observers, the nonlinear dynamics in the synchronization error equations for each subsystems are estimated in real time. Compensating the nonlinear estimations into controllers, the active disturbance rejection controllers are designed to achieve the synchronization. Finally, two examples of synchronization issues on different fractional-order chaotic systems are provided to verify that the fractional-order ADRC is irrelevant with the nonlinear dynamics in the fractional-order chaotic systems. The proposed controllers can achieve the synchronization and estimate the nonlinear dynamics effectively for different fractional-order chaotic systems.

关键词： Synchronization Nonlinear dynamical systems Chaos Equations Noise Observers

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An Approach of Bayesian Filtering for Stochastic Boolean Dynamic Systems

An Approach of Bayesian Filtering for Stochastic Boolean Dyn...

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第26届中国控制与决策会议

作者： Hongbin MA Dong WANG Hongsheng QI Mengyin FU School of Automation Beijing Institute of Technology the State Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing Institute of Technology the Key Laboratory of Systems and Control Institute of Systems ScienceAcademy of Mathematics and Systems ScienceChinese Academy of Sciences

This paper introduces an approach to estimate the true states for stochastic Boolean dynamic system(SBDS), where the state evolution is governed by Boolean functions with additive binary process noise while the measurement is an arbitrary function of the state yet with additive binary measurement *** problem of figuring out the true state using the only available noisy outputs is crucial for practical applications of Boolean dynamic system models, however, for such Boolean systems with wide background, there are no ready-to-use convenient tools like Kalman filter for linear systems. To resolve this challenging problem, an approach based on Bayesian filtering called Boolean Bayesian Filter(BBF) is put forward to estimate the true states of SBDS, and an efficient algorithm is presented for their exact computation. An index to evaluate the filtering performance,named estimation error rate, is put forward in this paper as well. In addition, extensive simulations via actual examples have illustrated the effectiveness of the proposed algorithm based on BBF.

关键词： Stochastic Boolean dynamic systems,Bayesian filtering,estimation algorithm,estimation error rate

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Anti-skid foot design for a humanoid robot

Anti-skid foot design for a humanoid robot

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IEEE International Conference on Robotics and Biomimetics

作者： Haotian She Weimin Zhang Hulin Huang Zhangguo Yu Xuechao Chen Qiang Huang Ministry of Education under Grant 2014CX02004 Key Laboratory of Biomimetic Robots and Systems (Beijing Institute of Technology) Beijing China Key Laboratory of Intelligent Control and Decision of Complex System Beijing China

ISBN: (纸本)9781479973989

Stable walking of bipedal humanoid is an crucial and challenge issue of research in bipedal robots. And the structure of shoe sole plays a significant role in preventing someone from slipping in human life. The humanoid robot foot often skid while the robot is walking fast, and it may cause serious harmfulness. This study presents some foot pads for humanoid robot to improve its stability and reliability. First, anti-skid foot for a humanoid robot is proposed in this paper. Second, the material and pattern of foot pads are selected. Finally, the better foot pads are chosen by several experiments and the effectiveness of the new foot pads is confirmed by comparison experiments.

关键词： Foot Legged locomotion Humanoid robots Footwear Friction Rubber

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Distributed stereoscopic rotating formation control of networks of second-order agents

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Journal of Systems Engineering and Electronics 2013年第3期24卷 480-487页

作者： Li Song Qinghe Wu Di Yu Yinqiu Wang Key Laboratory of Complex System Intelligent Control and Decision(Ministry of Education) School of AutomationBeijing Institute of Technology School of Automation Beijing Institute of Technology

Distributed stereoscopic rotating formation control of networks of second-order agents is investigated. A distributed control protocol is proposed to enable all agents to form a stereoscopic formation and surround a common axis. Due to the existence of the rotating mode, the desired relative position between every two agents is time-varying, and a Lyapunov-based approach is employed to solve the rotating formation control problem. Finally, simulation results are provided to illustrate the effectiveness of the theoretical results.

关键词： multi-agent system collective motion stereoscopic rotating formation control.

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Unsupervised robust recursive least-squares algorithm for impulsive noise filtering

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Science China(Information Sciences) 2013年第4期56卷 203-212页

作者： CHEN Jie MA Tao CHEN WenJie PENG ZhiHong School of Automation Beijing Institute of Technology Key Laboratory of Complex System Intelligent Control and Decision(Beijing Institute of Technology) Ministry of Education

A robust recursive least-squares(RLS) adaptive filter against impulsive noise is proposed for the situation of an unknown desired *** minimizing a saturable nonlinear constrained unsupervised cost function instead of the conventional least-squares function,a possible impulse-corrupted signal is prevented from entering the filter’s weight updating ***,a multi-step adaptive filter is devised to reconstruct the observed "impulse-free" noisy sequence,and whenever impulsive noise is detected,the impulse contaminated samples are replaced by predictive *** on simulation and experimental results,the proposed unsupervised robust recursive least-square adaptive filter performs as well as conventional RLS filters in "impulse-free" circumstances,and is effective in restricting large disturbances such as impulsive noise when the RLS and the more recent unsupervised adaptive filter fails.

关键词： unsupervised adaptive filtering impulsive noise suppression recursive least-squares algorithm

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Fast Adaptive Robust control of Electro-hydraulic Servo System

Fast Adaptive Robust Control of Electro-hydraulic Servo Syst...

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第三十二届中国控制会议

作者： HE Yudong WANG Junzheng HAO Renjian Key laboratory of intelligent control and decision of complex systems Beijing Institute of Technology

ISBN: (纸本)9781479900305

Electro-hydraulic servo systems(EHSSs) have been widely used in industrial and military applications for their high power-to-size ratio and the ability to supply huge ***,precise control of EHSSs cannot be easily obtained due to their inner nonlinearity and parameter *** load is another factor to decrease the tracking performance of *** adaptive robust control(IARC) was proposed to improve the tracking performance of EHSS,but due to the poor parameter adapting speed,IARC can be further improved to have better *** projection type parameter estimation algorithm is redesigned to increase the adapting speed when parameter is changed.A fast adaptive robust control (FARC) is then proposed to speed up the parameter adapting speed,so that a better tracking performance of FARC is maintained. Simulation results show that the proposed FARC gives an improved tracking performance and a faster parameter adaptation.

关键词： Electric-Hydraulic Servo System Fast Adaptive Robust control

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Distributed Adaptive Attitude Synchronization of Multiple Spacecraft with External Disturbances

Distributed Adaptive Attitude Synchronization of Multiple Sp...

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第25届中国控制与决策会议

作者： Dapeng Yang Xiangdong Liu Chao Gan Yaohua Guo Key laboratory for Intelligent Control & Decision of Complex Systems Beijing Institute of Technology

ISBN: (纸本)9781467355322

This paper considers the distributed attitude synchronization problem for multiple spacecraft with external disturbances. Distributed discontinuous adaptive controller is designed based on the relative attitudes and angular velocities of neighboring spacecraft and attitude synchronization can be reached for any communication graph containing a directed spanning tree. To tackle the chattering effect caused by the discontinuous controller, a continuous controller is further proposed, under which both the synchronization errors and the adaptive gains are ultimately bounded. Extensions to the case with a leader-follower communication graph with the leader as the spanning tree's root are further studied.

关键词： Multiple Spacecraft, Attitude Synchronization, Distributed control, Cooperative control

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Distributed Adaptive Sliding Mode control for Attitude Tracking of Multiple Spacecraft

Distributed Adaptive Sliding Mode Control for Attitude Track...

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第三十二届中国控制会议

作者： YANG Dapeng LIU Xiangdong LI Zhongkui GUO Yaohua Key laboratory for Intelligent Control & Decision of Complex Systems Beijing Institute of Technology

ISBN: (纸本)9781479900305

This paper considers the distributed attitude tracking problem of multiple spacecraft with disturbances and unknown inertia matrices. Based on the relative attitudes and angular velocities of neighboring spacecraft, we design a distributed robust controller to each follower to guarantee that the attitude errors between the followers and the leader converge to zero for any communication graph containing a directed spanning tree with the leader as the root. To deal with the problem of parameters uncertainties, we further propose a distributed adaptive sliding mode controller, under which the system is globally robust with respect to external disturbances and inertia matrices uncertainties.

关键词： Multiple Spacecraft, Sliding Mode control, Attitude Tracking, Distributed control, Adaptive control

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