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Low, Jin Huat; Khin, Phone May; Han, Qian Qian; Yao, Haicheng; Teoh, Yee Seng; Zeng, Yadan; Li, Si; Liu, Jun; Liu, Zhuangjian; Valdivia y Alvarado, Pablo; Chen, I-Ming; Tee, Benjamin Chee Keong; Yeow, Chen Hua
IEEE/ASME transactions on mechatronics, 2022-Oct., 2022-10-00, 20221001, Volume: 27, Issue: 5Journal Article
This article presents a versatile soft robotic gripper system whereby its fingers can be reconfigured into different poses such as scoop, pinch, and claw. This allows the gripper to efficiently and safely handle food samples of different shapes, sizes and stiffness such as uncooked tofu and broccoli floret. The 3D-printed fingers were tested to last up to 25 000 cycles without significant changes in the curvature profile and force output profile. A benchmark experiment was conducted to evaluate the performance of the gripper and state-of-the-art gripping solutions. Capability of versatile soft gripper was optimized by integrating vision and tactile sensing facilities. An object recognition system was developed to identify food samples such as potato, broccoli, and sausage. Position and orientation of food samples were identified and pick-and-place pathway was optimized to achieve the best gripping performance. Flexible tactile sensors were integrated into soft fingers and closed-loop force feedback control system was developed. This allowed the gripper to automatically explore and select the most stable grip pose for different food samples. Integration of vision and force feedback system ensure that objects detected by the system would be firmly gripped. The reconfigurable soft robotic gripper system has been demonstrated to perform high-speed pick-and-place tasks (∼3 s per item) with object recognition system, making it a potential solution to food and grocery supply chain needs.
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