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四指軟體機械手機械特性分析與抓取試驗
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國家自然科學基金項目(51305209)、江蘇省高等學校自然科學研究項目(18KJA4600050、21KJB460010)、江蘇省“六大人才高峰”高層次人才項目(GDZB-024)和機器人學國家重點實驗室開放項目(2018-O16)


Mechanical Performance Analysis and Grasping Experiment for Four-finger Soft Manipulator
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    摘要:

    軟體機械手在易損物品抓取方面具有其獨特的優(yōu)勢,近年來成為機器人領域的研究熱點。為便于評價軟體機械手的整體性能,實現(xiàn)其精確抓取控制,需要對軟體機械手進行建模分析與試驗研究。本文設計了四指軟體機械手,每個手指單元內(nèi)置用于實時檢測機械手彎曲角的柔性應變傳感器;建立了不同氣壓作用下的彎曲角和末端輸出力特性的數(shù)學模型,并分析限制層剛度變化對軟體手指輸出特性的影響;設計了軟體機械手控制系統(tǒng),在此基礎上開展軟體手指的彎曲角和末端輸出力特性試驗,試驗結(jié)果表明調(diào)節(jié)限制層剛度可有效改善輸出力,理論分析與試驗結(jié)果吻合,驗證了數(shù)學模型的正確性。對幾種不同質(zhì)量的常用水果(如草莓、橘子、梨、蘋果)的抓取試驗結(jié)果表明,軟體機械手能夠?qū)崿F(xiàn)對易損物體的無損抓取,其包絡抓取力最大為11.89N,指尖抓取力最大為2.81N。

    Abstract:

    The soft manipulator has its unique advantages in picking some fragile objects,which has been the focus of research field of robot. In order to evaluate the overall performance of the soft manipulator and further realize the precise grasping control of manipulator, it is necessary to carry out modeling analysis and experimental research on the soft manipulator. A four-finger soft manipulator integrated with flexible strain sensor that can illustrate the bending angle of soft actuator was developed. Moreover, the mathematical model for predicting the bending angle and end output force of the soft actuator upon various pressure was established, and the influence of variable stiffness for constraint layer on output performance of soft manipulator was analyzed as well. Furthermore, hardware control system of soft manipulator was developed and experimented on the bending angle, and output force of the soft pneumatic actuator were performed. Experimental results showed that the force output of soft manipulator can be improved by changing the stuffiness of constraint layer. In addition, the experimental data agreed well with the theoretical analysis results, which validated the correctness of the proposed mathematical model. Grasping tests on several commonly fruits of various shapes and length such as strawberry, orange, pear and apple demonstrated that the soft manipulator can achieve nondestructive grasping of fragile and fragile objects easily. The envelope grasping force of the soft manipulator was up to 11.89N, and the fingertip grasping force was 2.81N. The research results can provide theoretical guidance and reference for the widely application of soft manipulator.

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朱銀龍,趙虎,蘇海軍,馮凱,華超,劉英.四指軟體機械手機械特性分析與抓取試驗[J].農(nóng)業(yè)機械學報,2022,53(9):434-442. ZHU Yinlong, ZHAO Hu, SU Haijun, FENG Kai, HUA Chao, LIU Ying. Mechanical Performance Analysis and Grasping Experiment for Four-finger Soft Manipulator[J]. Transactions of the Chinese Society for Agricultural Machinery,2022,53(9):434-442.

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  • 收稿日期:2022-06-01
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  • 在線發(fā)布日期: 2022-09-10
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