0
research-article

Spring-assisted motorized transmission for flexible flapping wings

[+] Author and Article Information
Yao-Wei Chin

School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
ywchin@ntu.edu.sg

Ziyuan Ang

School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
angziyuan@yahoo.com

Yukai Luo

School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
luo_yu_kai_@hotmail.com

Woei Leong Chan

Temasek Laboratories, National University of Singapore, Singapore 117411
tslcwl@nus.edu.sg

Javaan S. Chahl

School of Engineering, University of South Australia, Mawson Lakes SA 5095, Australia
javaan.chahl@unisa.edu.au

Gih-Keong Lau

School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
mgklau@ntu.edu.sg

1Corresponding author.

ASME doi:10.1115/1.4041430 History: Received April 22, 2018; Revised August 30, 2018

Abstract

As inspired by elastic storage found in flying insects, various springs were developed as the means of elastic storage in the tethered or wired wing-transmission to save inertial power of two flapping wings. However, hovering micro air vehicles (MAV) with four flapping wings like as Mentor or DelFly had yet adopted any elastic storage. Full recovery of four wings' kinetic energy requires a stiffer spring, which however adds extra weights and may impede the motor from running. It was not clear if partial elastic storage still helps to benefit thrust generation, if not sufficient power saving. Here, we developed a ultralight and compact film hinges suitable for integration to a motorized double-crank-rocker mechanism to flap four flexible wings. A spring of two 20mm-wide film hinges was designed to provide enough elastic storage but does not overload the motor from driving the wing-transmission above the natural frequency of hinged wings. Experiments show that forceful wing beat helps produce higher thrust with the help of strong spring recoil. When being powered by a 3.18 gram brushless motor, this 13.4 gram fwMAV prototype with elastic transmission can take off by beating four flexible wings (of 240mm span) for up to 21-22 gram thrust generation at 22-23Hz. Interestingly, the electric-power-specific thrust generated by flapping four wings can be as higher that generate by the motor(AP03-7000Kv)-manufacturer recommended propeller.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In