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arXiv 1808.08252cs.ROcs.SYeess.SY
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复合张力结构机器人的逆静态优化

Inverse Statics Optimization for Compound Tensegrity Robots

Department of Mechanical Engineering, University of California Berkeley(加州大学伯克利分校机械工程系);Intelligent Systems Division, NASA Ames Research Center(NASA阿姆斯研究中心智能系统部)

Andrew P. Sabelhaus, Albert H. Li, Kimberly A. Sover, Jacob Madden, Andrew Barkan, Adrian K. Agogino, Alice M. Agogino

AI总结:

本文提出了一种方法,用于计算复合张力结构机器人的电缆张力,以实现静态平衡。该方法基于改进的力密度法,通过二次优化问题解决电缆张力计算,并通过仿真和硬件实验验证了其在脊柱机器人和四足机器人设计与控制中的有效性。

摘要:

由电缆驱动的张力结构(张力-完整性)机器人具有软机器人许多优点,如灵活性和鲁棒性,同时仍遵循简单的静态和动态模型。然而,现有的张力结构建模方法无法原生描述具有任意刚体的张力网络的机器人。本文提出了一种方法,用于计算此类张力结构机器人的电缆张力,这里定义为复合张力结构。首先,将复合张力结构机器人的静态平衡模型重新表述为用于其他张力结构的标准力密度法。接下来,我们提出了在所提出模型下计算机器人电缆张力的问题。提出了解决方案作为带有实际约束的二次优化问题。仿真展示了如何利用该逆静态优化问题来设计和控制两种不同的复合张力结构应用:由该脊柱制成的脊柱机器人和四足机器人。最后,通过硬件实验验证了逆静态模型的准确性,证明了使用所提出方法进行低误差开环控制的可行性。

英文摘要:

Robots built from cable-driven tensegrity (`tension-integrity') structures have many of the advantages of soft robots, such as flexibility and robustness, while still obeying simple statics and dynamics models. However, existing tensegrity modeling approaches cannot natively describe robots with arbitrary rigid bodies in their tension network. This work presents a method to calculate the cable tensions in static equilibrium for such tensegrity robots, here defined as compound tensegrity. First, a static equilibrium model for compound tensegrity robots is reformulated from the standard force density method used with other tensegrity structures. Next, we pose the problem of calculating tension forces in the robot's cables under our proposed model. A solution is proposed as a quadratic optimization problem with practical constraints. Simulations illustrate how this inverse statics optimization problem can be used for both the design and control of two different compound tensegrity applications: a spine robot and a quadruped robot built from that spine. Finally, we verify the accuracy of the inverse statics model through a hardware experiment, demonstrating the feasibility of low-error open-loop control using our proposed methodology.

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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