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国际机械中心“智能制造、检测与诊断”系列学术讲座通知(八)

Flow-sensing mechanisms and biomimetic potential of seal whiskers

发布时间:2022-11-09 点击数:

讲座人:

Dr. Xingwen Zheng is a JSPS Postdoctoral Fellow in the Department of Mechanical Engineering at the University of Tokyo. He completed his Ph. D. programs at Peking University (Project: Bionic Sensing with Artificial Lateral Line Systems for Fish-Like Underwater Robots; Supervisor: Prof. Guangming Xie) and the University of Groningen (Project: Flow Sensing Mechanisms of Seal Whiskers and Bio-Inspired Design to Create Artificial Whisker Sensors; Supervisors: Prof. Ming Cao and Dr. Ajay Kottapalli). He has been awarded the Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellowship, which fully supports his research on Micro Robotic Manipulation Systems in Prof. Fumihito Arai’s lab at the University of Tokyo. He published papers as the first author in several esteemed journals and flagship conferences, including Advanced Functional Materials (selected as Cover), Advanced Science, IEEE Transactions on Robotics, IEEE/ASME Transactions on Mechatronics, IEEE IROS, IEEE MEMS, Transducers, etc. In addition, He is the author of two books. He also has ten issued patents. Furthermore, he received the IOP Publishing China Top Cited Paper Award (2018-2020). His research interests include bio-inspired robotics, biomimetics, MEMS/NEMS technology, and micromanipulation..

讲座简介:

Marine animals perform fascinating survival hydrodynamics through perfectly evolved sensory systems. For example, Phocid seals, including grey (Halichoerus grypus) and harbor (Phoca vitulina) seals, use only their whiskers to detect prey from 180m away. Due to their unique undulating morphology, phocid seal whiskers reduce noisy vortex-induced vibrations (VIV) and lock their frequency to wakes generated by swimming fishes, making them highly sensitive to biologically relevant flow stimuli. We developed a mathematical framework that accurately recreates the undulating geometry of harbor and grey seal whiskers using 3D scanning. Fluid-structure interaction (FSI) studies and experiments involving fully 3D-printed whisker-inspired MEMS sensors with high gauge factor graphene nanoplatelets piezoresistors have been used to fully explain the vibration characteristics of whisker arrays and their interactions in steady flows and fish-wake-like vortices. Results showed that grey (Halichoerus grypus) seal whiskers consistently produced lower downstream vortices and resulting VIVs than harbor (Phoca vitulina) seal whiskers. Additionally, 3D-printed whisker-inspired MEMS sensors were used to determine the effect of the angle of attack (AOA) of the seal whisker on its VIVs. Finally, by locking to the frequency of the upstream wake generator, whisker-inspired sensors can sense the upstream wake generator with a separation up to 10× times the whisker diameter in a recirculating water flume, mimicking the sensing mechanism of the seal whiskers. The VIV reduction and the frequency-locking abilities with the upstream wake generator demonstrated a high signal-tonoise ratio of the whisker-inspired MEMS sensor, indicating a high potential for applications of underwater robots to assist in environment perception and long-distance object tracking


讲座时间:2022/11/16 14:00-17:00 #腾讯会议:510-822-165

腾讯会议链接: https://meeting.tencent.com/dm/DeSYjNAFSTq0


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