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A Piezoelectrically Driven Microrobot Using a Novel Monolithic Spatial Parallel Mechanism as Its Hip Joint

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Abstract

Inspired by the fast, agile movements of insects, we present a 1.9 g, 4.5 cm in length, piezoelectrically driven, quadrupedal microrobot. This microrobot uses a novel spatial parallel mechanism as its hip joint, which consists of two spatially orthogonal slider-crank linkages. This mechanism maps two inputs of two independent actuators to the decoupled swing and lift outputs of a leg, and each leg can produce the closed trajectories in the sagittal plane necessary for robot motion. Moreover, the kinematics of the transmission are analyzed, and the parameters of the flexure hinges are designed based on geometrical constraints and yield conditions. The hip joints, legs and exoskeletons are integrated into a five-layer standard laminate for monolithic fabrication which is composed of two layers of carbon fiber, two layers of acrylic adhesive and a polyimide film. The measured output force (15.97 mN) of each leg is enough to carry half of the robot’s weight, which is necessary for the robot to move successfully. It has been proven that the robot can successfully perform forward and turning motions. Compared to the microrobot fabricated with discrete components, the monolithically fabricated microrobot is more capable of maintaining the original direction of locomotion when driven by a forward signal and has a greater speed, whose maximum speed is 25.05 cm/s.

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The data that support the findings of this study are not openly available due to some restrictions and are available from the corresponding author upon reasonable request.

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Acknowledgements

This research was supported by the Shanghai professional technology service platform under Grant 19DZ2291103.

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Authors and Affiliations

  1. National Key Laboratory of Advanced Micro and Nano Manufacture Technology, Shanghai Jiao Tong University, Shanghai, 200240, China

    Guangping Wu, Ziyang Wang, Jiaxin Zhao, Feng Cui & Xinghan Cai

  2. Department of Micro-Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Guangping Wu, Ziyang Wang & Jiaxin Zhao

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  1. Guangping Wu
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  2. Ziyang Wang
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Correspondence to Feng Cui.

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Wu, G., Wang, Z., Zhao, J. et al. A Piezoelectrically Driven Microrobot Using a Novel Monolithic Spatial Parallel Mechanism as Its Hip Joint. J Bionic Eng 21, 803–820 (2024). https://doi.org/10.1007/s42235-024-00484-9

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