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arXiv 2210.08780cs.ROcs.SYeess.SY
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基于贝叶斯优化的软体机器人样本有效模型预测控制设计

Sample-efficient Model Predictive Control Design of Soft Robotics by Bayesian Optimization

Michigan State University(密歇根州立大学);Utah State University(犹他州立大学)

Anuj Pal, Tianyi He, Wenpeng Wei

摘要:

提出了一种基于贝叶斯优化的数据驱动模型预测控制(MPC)设计方法。该方法不需要对软体机器人的复杂动力学模型进行建模,而是利用贝叶斯优化方法搜索最佳预测的低维预测模型及其控制器,以最小化闭环响应的目标函数。在每次迭代中,通过贝叶斯优化从闭环输入-输出数据更新预测模型。然后基于更新的预测模型设计线性MPC,并基于闭环响应进行评估。与直接搜索控制器参数不同,闭环系统的稳定性和输入/输出约束可以很容易地在MPC设计中处理。经过几次迭代,可以得到一个收敛的(次)最优控制器的解决方案,它最小化用户定义的闭环性能指标。通过一个柔索驱动的软体机器人的高保真仿真,对所提出的方法进行了仿真和验证。仿真结果表明,所提出的方法可以实现理想的跟踪控制器的软体机器人没有事先已知的模型。

英文摘要:

This paper presents a sample-efficient data-driven method to design model predictive control (MPC) for cable-actuated soft robotics using Bayesian optimization. Instead of modeling the complex dynamics of the soft robots, the proposed approach uses Bayesian optimization to search the best-guessed low-dimensional prediction model and its associated controller to minimize the objective function of closed-loop responses. The prediction model is updated by Bayesian optimization from the closed-loop input-output data in each iteration. A linear MPC is then designed based on the updated prediction model, and evaluated based on the closed-loop responses. Different from directly searching controller parameters, the closed-loop system stability, and inputs/outputs constraints can be easily handled in the MPC design. After a few iterations, a convergent solution of a (sub-)optimal controller can be obtained, which minimizes the user-defined closed-loop performance index. The proposed method is simulated and validated by a high-fidelity simulation of a cable-actuated soft robot. The simulation results demonstrate that the proposed approach can achieve desired tracking controller for the soft robot without a prior-known model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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