Mr. Kai He Profile

Kai He

at SIAT CAS

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Publications (2)

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Proceedings Article | 1 December 2023 Paper

Design and experimental study of a novel underwater bionic propulsion mechanism

Xiaowu Han, Gong Zhao, Te Li, Yaohui Xu, Fengran Xie, Kai He, Qiyang Zuo

Proceedings Volume 12940, 129402H (2023) https://doi.org/10.1117/12.3010596

KEYWORDS: Biomimetics, Robotics, Design and modelling, Amplitude modulation

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At present, most of bionic robotic fish in BCF mode make use of reciprocating positive and negative rotation of a servo to drive the swing motion of the tail fin. However, the swing frequency of the tail fin of the robotic fish is relatively low and the generated propulsive force is also relatively small due to the influence of the properties of the servo. The other robotic fish which use DC motor or other unidirectional rotation motor to drive the tail fin have to take advantage of complex mechanical structure to realize reciprocating swing motion of the tail fin, even so, the swing amplitude of the tail fin cannot be adjusted directly. This paper presents a novel bionic swing propulsion mechanism which is driven by a stepper motor. The tail fin can swing at a high frequency by controlling the rotate speed in positive rotation of the stepper motor, and correspondingly, the swing amplitude of the tail fin can be adjusted by controlling the stepper motor to reverse rotation. In addition, a steering mechanism is added to this bionic swing propulsion mechanism to realize the steering function for the propulsion mechanism. The presented swing propulsion mechanism can be directly used for a swing mechanism of tail fin of robotic fish, or even can act as a kind of bionic propeller of underwater vehicle to replace the traditional screw propeller. In order to verify the feasibility of this underwater bionic propulsion mechanism, a series of swimming experiment were carried out.

Proceedings Article | 16 December 2022 Paper

Development of special CNC system for dental implant based on spiral trajectory smooth compression

Qingping Xu, Gang Zhao, Bo Huang, Hua Shao, Kai He

Proceedings Volume 12500, 125002G (2022) https://doi.org/10.1117/12.2660844

KEYWORDS: Control systems, Manufacturing, Spindles, Control systems design, Computer aided design, Algorithm development

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The demand for dental implants has grown rapidly in recent years, but they are expensive. One of the prime reasons is its manufacturing costs. In order to realize low cost and high efficiency of dental implant processing, this paper presents a seven-axis machine tool and develops a special numerical control system of the machine tool. Firstly, the structure of machine designed by us is introduced. Then, the hardware structure and software function of the control system were designed according to the processing technology of dental implant, including turning-milling conversion and back processing. In addition, a spiral path smooth compression algorithm was proposed to improve the machining efficiency and quality. Finally, the performance of the machining center is tested to verify that it has a high degree of automation, processing efficiency and machining quality, which meets the performance requirements.

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