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为了进一步提高仿人机器人步行时的稳定性,通过对人类步行的研究,并从两足步行机的两步步态规划方法中得到启发,对仿人机器人步行也进行类似的两步规划,但由于结构上的不同,仿人机器人中采用加入上肢运动补偿的方式实现平衡.规划仿人机器人的运动姿态,然后根据零力矩点必须落在稳定区域的原则,对仿人机器人的上肢运动轨迹进行求解,通过这种加入上肢补偿的两步规划来实现仿人机器人的稳定步行.从实验结果可以看出,采用这种两足步态规划方法,在仿人机器人两足步行时,可以使机器人上肢与下肢协调运动,从而提高了步行的稳定性. 相似文献
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步行环境不理想、外力扰动等因素导致仿人机器人步行时ZMP出现误差,从而影响机器人的步行稳定性.由于机器人的各关节角度都对ZMP有影响,若只校正支撑腿的踝关节或髋关节等单个关节角度,则难以达到理想的步行控制效果,因此,本文综合考虑各关节角度对ZMP的影响,先通过模糊控制器基于ZMP误差给出机器人的质心位置增量,再利用二次规划方法和质心的雅可比矩阵求解出满足该质心位置增量的各关节角度校正量.仿真实验表明,本文方法较好地跟踪了期望ZMP,提高了步行稳定裕度,使仿人机器人实现了稳定的步行. 相似文献
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提出利用机器人质心(CoM)雅克比矩阵,实现全身协调补偿的算法。提出机器人的简化模型;分析基于CoM雅克比矩阵的补偿算法;采用CoM/ZMP(零点矩点)、减振和软着陆控制器实时控制双足步行,实现机器人全身协调的稳定控制;通过仿人机器人AFU09的双足步行实验证明该控制方法的有效性。 相似文献
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基于零力矩点(ZMP)的预测控制是目前双足机器人步行控制中最先进的方法,但是预测控制需要比较精确的预测模型,在环境扰动导致模型失配时,预测控制的性能下降较快。为了解决这个问题,利用仿人智能控制对环境误差具有较强抑制的特点改进预测控制。探讨了在步行控制中引入仿人智能控制的必要性和仿人智能控制改进预测控制的可行性,并设计了仿人预测控制器。最后通过仿真实验验证了新的控制器对双足机器人步行控制的有效性。 相似文献
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针对目前仿人机器人动态步行在样机上实现较少的情况,将多项式插值方法运用于机器人踝关节轨迹规划,结合已知髋关节运动轨迹,利用几何约束的方法求取膝关节运动轨迹,得到完整步态周期内各关节运动规律,最终实现NAO机器人的动态步行。实验结果证实了基于多项式插值的几何约束规划方法是可行且有效的。 相似文献
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A humanoid robot has high mobility but possibly risks of tipping over. Until now, one main topic on humanoid robots is to study the walking stability; the issue of the running stability has rarely been investigated. The running is different from the walking, and is more difficult to maintain its dynamic stability. The objective of this paper is to study the stability criterion for humanoid running based on the whole dynamics. First, the cycle and the dynamics of running are analyzed. Then, the stability criterion of humanoid running is presented. Finally, the effectiveness of the proposed stability criterion is illustrated by a dynamic simulation example using a dynamic analysis and design system (DADS). 相似文献
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本文分析了步行机器人中现有的两类稳定裕度的度量方法.给出了一种既考虑步行机构及支撑地形特点,又考虑步行速度因素影响的动态度量方法——机械能稳定裕度度量. 相似文献
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During dynamic walking of biped robots, the underactuated rotating degree of freedom (DOF) emerges between the support foot and the ground, which makes the biped model hybrid and dimension-variant.This paper addresses the asymptotic orbit stability for criterion for DVHS is also presented,
and the result is then used to study dynamic walking for a five-link
planar biped robot with feet. Time-invariant gait planning and
nonlinear control strategy for dynamic walking with flat feet is
also introduced. Simulation results indicate that an asymptotically
stable limit cycle of dynamic walking is achieved by the proposed
method. 相似文献
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Stability and control of dynamic walking for a five-link planar biped robot with feet 总被引:1,自引:0,他引:1
During dynamic walking of biped robots, the underactuated rotating degree of freedom (DOF) emerges between the support foot and the ground, which makes the biped model hybrid and dimension-variant. This paper addresses the asymptotic orbit stability for dimension-variant hybrid systems (DVHS). Based on the generalized Poincare map, the stability criterion for DVHS is also presented, and the result is then used to study dynamic walking for a five-link planar biped robot with feet. Time-invariant gait planning and nonlinear control strategy for dynamic walking with fiat feet is also introduced. Simulation results indicate that an asymptotically stable limit cycle of dynamic walking is achieved by the proposed method. 相似文献
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In this article, the method for increasing dynamic stability of quadruped robot is proposed. Previous researches on dynamic
walking of quadruped robots have used only walking pattern called central pattern generator (CPG). In this research, different
from walking generation with only CPG, a instinctive stability measure called landing accordance ratio, is proposed and used
for increasing dynamic stability. In addition, dynamic balance control and control to adjust walking trajectory for increasing
dynamic stability measure is also proposed. Proposed methods are verified with dynamic simulation and a large number of experiments
with quadruped robot platform. 相似文献
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Philippe Gorce Farid El Hafi Juan Lopez Coronado 《Journal of Intelligent and Robotic Systems》2001,31(4):321-337
This paper focuses on numerical method to solve the dynamic equilibrium of a humanoid robot during the walking cycle with the gait initiation process. It is based on a multi-chain strategy and a dynamic control/command architecture previously developed by Gorce. The strategy is based on correction of the trunk center of mass acceleration and force distribution of the forces exerced by the limbs on the trunk. This latter is performed by mean of a Linear Programming (LP) method. We study the gait initiation process when a subject, initially in quiet erect stance posture, performs a walking cycle. In this paper, we propose to adjust the method for the multiphases (from double support to single support) and multicriteria features of the studied movement. This is done by adapting some specific constraints and criteria in order to ensure the global stability of the humanoid robot along the task execution. For that, we use a Real-Time Criteria and Constraints Adaptation method. Simulation results are presented to demonstrate criteria and constraints influences on the dynamic stability. 相似文献
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A reduced-order dynamic compensator design is presented with stability robustness for linear discrete systems, by including a stability robustness component in addition to the standard quadratic state and control terms in the performance criterion. The robustness component is based on an unstructured perturbation stability bound for time varying perturbations. The controller design is developed by the parameter optimization technique and involves the solution of five algebraic matrix equations, four of which are discrete-time Lyapunov matrix equations 相似文献
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六足机器人是一种具有多支链与时变拓扑结构的特种机器人,该类机器人能够在复杂环境中稳定行走,长期以来一直是国内外机器人研究领域的热点之一。本文从仿生角度出发,归纳六足机器人稳定行走的三种方式;根据六足机器人各足支撑点围成的多边形区域与机体重心在其投影的关系来评定六足机器人行走稳定性,为实现六足机器人稳定性行走提供理论依据;最后根据机器人控制精度增加和智能力减少的原则,以分级递阶的方式设计六足机器人的运动控制系统。 相似文献