This paper presents a disturbance rejection scheme for walking robots under unknown external forces and moments. The disturbance rejection strategy, which combines the inverse dynamics control with the acceleration pr...This paper presents a disturbance rejection scheme for walking robots under unknown external forces and moments. The disturbance rejection strategy, which combines the inverse dynamics control with the acceleration projection onto the ZMP (zero moment point)-plane, can ensure the overall dynamic stability of the robot during tracking the pre-computed trajectories. Under normal conditions, i.e., the system is dynamically balanced, a primary inverse dynamics control is utilized. In the case that the system becomes unbalanced due to external disturbances, the acceleration projection control (APC) loop, will be activated to keep the dynamic stability of the walking robot through modifying the input torques. The preliminary experimental results on a robot leg demonstrate that the proposed method can actually make the robot keep a stable motion under unknown external perturbations.展开更多
为了有效地验证类人猿型机器人"GOROBOT"的双足动步行能力,通过合理地将可变ZMP(Zero Moment Point)的变化规律定义为余弦曲线,并基于三维倒立摆的动力学原理,推导出了单脚支撑期内机器人质心轨迹方程。在此基础上,采用样条...为了有效地验证类人猿型机器人"GOROBOT"的双足动步行能力,通过合理地将可变ZMP(Zero Moment Point)的变化规律定义为余弦曲线,并基于三维倒立摆的动力学原理,推导出了单脚支撑期内机器人质心轨迹方程。在此基础上,采用样条插值函数来保证机器人质心加速度的连续性,从而提出了基于这种可变ZMP的双足动步行关节轨迹生成方法。最后,在虚拟物理环境下利用仿真软件实现了虚拟的3-D类人猿机器人"GOROBOT"双足动步行,验证了方法的正确性和实际类人猿机器人"GOROBOT"的双足动步行能力。展开更多
文摘This paper presents a disturbance rejection scheme for walking robots under unknown external forces and moments. The disturbance rejection strategy, which combines the inverse dynamics control with the acceleration projection onto the ZMP (zero moment point)-plane, can ensure the overall dynamic stability of the robot during tracking the pre-computed trajectories. Under normal conditions, i.e., the system is dynamically balanced, a primary inverse dynamics control is utilized. In the case that the system becomes unbalanced due to external disturbances, the acceleration projection control (APC) loop, will be activated to keep the dynamic stability of the walking robot through modifying the input torques. The preliminary experimental results on a robot leg demonstrate that the proposed method can actually make the robot keep a stable motion under unknown external perturbations.
文摘为了有效地验证类人猿型机器人"GOROBOT"的双足动步行能力,通过合理地将可变ZMP(Zero Moment Point)的变化规律定义为余弦曲线,并基于三维倒立摆的动力学原理,推导出了单脚支撑期内机器人质心轨迹方程。在此基础上,采用样条插值函数来保证机器人质心加速度的连续性,从而提出了基于这种可变ZMP的双足动步行关节轨迹生成方法。最后,在虚拟物理环境下利用仿真软件实现了虚拟的3-D类人猿机器人"GOROBOT"双足动步行,验证了方法的正确性和实际类人猿机器人"GOROBOT"的双足动步行能力。