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Nonlinear control by coupled oscillator: from nonholonomic systems to quasi-passive dynamic walker

机译:耦合振荡器的非线性控制:从非完整系统到准被动动态助步器

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摘要

In this paper, we propose a novel control method for nonholonomic constrained systems using coupled oscillators composed through the Kuramoto model. The Kuramoto model is a mathematical model used to describe synchronization phenomenona. We focus on the Kuramoto model because it is able to generate stable rhythmic signals that are modulable for engineering, and because it is sufficiently simple for mathematical analysis. The contributions of this paper are twofold. First, we propose the use of a pair of Kuramoto oscillators as dynamic controllers for a nonholonomic Brockett integrator system;next, we define a feedback control scheme by adjusting its angular velocities based on the system state. We then derive stability criteria for the entire feedback system and examine the effectiveness of the system through several numerical simulations. We also show that the proposed idea is applicable to a two-wheeled vehicle system, which is locally equivalent to the Brockett integrator under proper coordinate and input transformations. Second, we apply the proposed method to control the walking distance of a quadrupedal quasi-passive dynamic walker and examine the effectiveness of the proposed method through walking experiments.
机译:在本文中,我们提出了一种新的控制方法,该方法使用了通过Kuramoto模型组成的耦合振荡器的非完整约束系统。仓本模型是用于描述同步现象的数学模型。我们将重点放在仓本模型上,因为它能够生成稳定的有节奏的信号,这些信号可以进行工程调制,并且对于数学分析而言足够简单。本文的贡献是双重的。首先,我们建议使用一对仓本振荡器作为非完整Brockett积分器系统的动态控制器;接下来,我们通过根据系统状态调整其角速度来定义反馈控制方案。然后,我们导出整个反馈系统的稳定性标准,并通过几个数值模拟检查系统的有效性。我们还表明,提出的想法适用于两轮车系统,在适当的坐标和输入转换下,该系统局部等效于Brockett积分器。其次,我们将提出的方法应用于控制四足准无源动态助行器的步行距离,并通过步行实验验证了该方法的有效性。

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