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arXiv 1806.04894cs.RO
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液压弹性体作动器的设计、制造与控制

Design, Fabrication and Control of an Hydraulic Elastomer Actuator

Tampere University of Technology(坦佩雷理工大学)

Mahdi Momeni Kelageri, Mikko Heikkila, Minna Poikelispaa, Reza Ghabcheloo, Matti Linjama, Jyrki Vuorinen

摘要:

本文介绍了一种柔性二维机械臂的设计、制造和控制,即所谓的软驱动器。我们专注于由恒压液压供应和调制开/关阀驱动的纤维增强弹性体执行器。对于给定的直径,我们研究了四种不同的弹性体材料和增强纤维匝数对致动器产生的力和最大弯曲角度的影响。对于研究的其余部分,我们使用聚二甲基硅氧烷(PDMS),每170 mm长度的致动器具有240个纤维匝,其在我们的实验中承受最高的压力和力。在本文的其余部分,我们介绍了两种控制方法。首先,我们表明,是可能的,以合理地准确地控制管内的压力,而无需测量压力,结合一个简单的线性管模型。这可以用于例如具有PI位置控制的内外环配置中,以实现高性能而无需压力测量。其次,我们的实验表明,开关位置控制具有很好的稳态精度和可接受的瞬态。使用外部视觉系统测量致动器尖端位置。我们的实验包括我们的软机械手的性能分析,同时自由移动,以及当携带负载。

英文摘要:

This paper presents design, fabrication and control of a compliant 2D manipulator, a so called soft actuator. Our focus is on fiber-reinforced elastomer actuators driven by a constant pressure hydraulic supply and modulated on/off valves. For a given diameters, we study the effect of four different elastomer materials and that of number of reinforcement fiber turns on forces generated by the actuator and maximum bending angles. For the rest of the study, we use polydimethylosiloxane (PDMS) with 240 fiber turns per 170mm length of actuator which withstand highest pressures and forces in our experiments. For the rest of the paper, we introduce two control methodologies. Firstly, we show that is possible to reasonably accurately control the pressure inside tube without measuring the pressure incorporating a simple linear tube model. This can be used, for example, in an inner-outer loop configuration with a PI position control to achieve high performance without the need for pressure measurement. Secondly, we experimentally show that a switching position control exhibits very good steady state accuracy and acceptable transient. Actuator tip position is measured using an external vision system. Our experiments included performance analysis of our soft manipulator while freely moving as well as when carrying a load.

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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