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Nonlinear Model-Based Control Architecture for Antagonistic Pairs of Fluidic Muscles in Manipulator Motion Control

机译:机械手动控制中流体肌肉拮抗对的非线性模型控制架构

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In this paper a control structure and joint trajectory planning algorithm are presented for a type of kinematically redundant manipulator actuated by joints with pairwise antagonistic pneumatic muscles. The used muscles and the resulting behavior of a single manipulator joint featuring antagonistic muscles in a symmetric configuration are characterized. The joint limits resulting from the limited deflection of the pneumatic muscles can present a problem for the planning of the reference joint trajectories. An algorithm is presented to ensure the joint limit avoidance in the redundancy resolution of the presented manipulator. Beside the distinct limits, the pneumatic joint actuation also results in a hysteretic behavior, it is shown that in this case the hysteresis can be described by a Preisach hysteresis model. The resulting hysteresis model allows the construction of a model-reference following controller, with a model control loop, designed for good tracking performance and a disturbance rejection loop optimized for suppression of disturbances. Experiments confirm the improvement in tracking control as compared to the system solely controlled by a feedback regulator.
机译:本文介绍了一种控制结构和联合轨迹规划算法,用于一种运动型冗余机械手,具有成对拮抗气动肌肉的关节致动。特征在特征在于,在对称配置中具有拮抗肌的单个操纵器关节的使用肌肉和所产生的行为。由于气动肌肉的有限偏转产生的关节限制可能为参考联合轨迹的规划提供问题。提出了一种算法,以确保在所提出的操纵器的冗余分辨率下进行关节限制。除了不同的限制之外,气动关节致动还会导致滞后行为,示出在这种情况下,可以通过预震段滞后模型来描述滞后。由此产生的滞后模型允许构造模型引用后控制器,采用模型控制回路,设计用于良好的跟踪性能和用于抑制干扰的干扰抑制回路。实验证实了与仅由反馈稳压器控制的系统相比的跟踪控制的改善。

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