J4 ›› 2016, Vol. 13 ›› Issue (4): 544-557.doi: 10.1016/S1672-6529(16)60327-X

• 论文 • 上一篇    下一篇

Investigation on the Reduction of Center of Mass Oscillations of Flexible Flapping Fins

Ashok K Kancharala, Michael K Philen   

  1. Aerospace and Ocean Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
  • 收稿日期:2016-03-04 修回日期:2016-09-04 出版日期:2016-10-10 发布日期:2016-10-10
  • 通讯作者: Ashok Kancharala E-mail:ashok@vt.edu
  • 作者简介:Ashok K Kancharala, Michael K Philen

Investigation on the Reduction of Center of Mass Oscillations of Flexible Flapping Fins

Ashok K Kancharala, Michael K Philen   

  1. Aerospace and Ocean Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
  • Received:2016-03-04 Revised:2016-09-04 Online:2016-10-10 Published:2016-10-10
  • Contact: Ashok Kancharala E-mail:ashok@vt.edu
  • About author:Ashok K Kancharala, Michael K Philen

摘要:

Nature has been a source of inspiration for developing advanced autonomous aerial and underwater vehicles. The bodies with flapping appendages produce Center of Mass (COM) oscillations as the flapping fins generate forces oscillatory in nature. The vehicles with larger COM oscillations pose the problems of control and maneuverability and this paper discusses the effect of flexibility and other operating parameters such as heaving, pitching amplitudes and operating frequency on COM oscillations. A detailed theoretical investigation has been carried out to predict the optimal operating parameters along with the fin stiffness to reduce the COM oscillations for a given Self-Propelled Speed (SPS). Experiments have been performed to validate the theoretical results. It has been observed that the flexible fins operating at larger frequencies produce lower COM oscillations compared to stiffer fins operating at lower frequencies for a given mean thrust/SPS, and that the trailing edge amplitude along with the deformation pattern play a role in the generation of COM oscillations.

关键词: flapping fin, fluid-structure interaction, optimization, digital image correlation

Abstract:

Nature has been a source of inspiration for developing advanced autonomous aerial and underwater vehicles. The bodies with flapping appendages produce Center of Mass (COM) oscillations as the flapping fins generate forces oscillatory in nature. The vehicles with larger COM oscillations pose the problems of control and maneuverability and this paper discusses the effect of flexibility and other operating parameters such as heaving, pitching amplitudes and operating frequency on COM oscillations. A detailed theoretical investigation has been carried out to predict the optimal operating parameters along with the fin stiffness to reduce the COM oscillations for a given Self-Propelled Speed (SPS). Experiments have been performed to validate the theoretical results. It has been observed that the flexible fins operating at larger frequencies produce lower COM oscillations compared to stiffer fins operating at lower frequencies for a given mean thrust/SPS, and that the trailing edge amplitude along with the deformation pattern play a role in the generation of COM oscillations.

Key words: flapping fin, fluid-structure interaction, optimization, digital image correlation