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Gain Scheduling Control for a Class of Variable Stiffness Actuators Based on Lever Mechanisms

机译:基于杠杆机制的一类可变刚度执行器增益调度控制

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摘要

This paper is concerned with the design of a control strategy for variable stiffness actuators in series configuration, exploiting the lever concept to adjust the stiffness at the transmission. A control strategy based on gain scheduling is proposed, which is able to regulate both stiffness and position at output link. The gain scheduling is designed based on a set of linear quadratic regulators (LQRs), because LQR’s inherent robustness properties can accommodate significant variation in the actuation plant parameters. The link positioning relies on continuous adjustment of the control effort based on the current transmission stiffness; the stiffness perceived at the output link is regulated through combined action of the transmission stiffness and the positioning gains of the scheduling strategy. The effectiveness of the controller is verified in simulation and experiments on the actuator with adjustable stiffness. The overall strategy has been proven to be locally stable.
机译:本文关注串联配置的可变刚度致动器的控制策略的设计,它利用杠杆概念来调节变速器的刚度。提出了一种基于增益调度的控制策略,该策略能够同时调节输出链路的刚度和位置。增益调度是基于一组线性二次调节器(LQR)设计的,因为LQR的固有鲁棒性可以适应执行机构参数的显着变化。链节定位依赖于基于当前传动系统刚度的控制力的连续调整;通过传输刚度和调度策略的定位增益的组合作用来调节在输出链路上感知到的刚度。该控制器的有效性已在具有可调刚度的执行器的仿真和实验中得到验证。总体策略已被证明是本地稳定的。

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