NDLI: The Mechanics of Fast-Start Performance of Pike Studied Using a Mechanical Fish

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Feng, Chengcheng Brian, R. Bonafilia Modarres-Sadeghi, Yahya Michael, S. Triantafyllou
Copyright Year	2011
Abstract	A northern pike (Esox lucius) is capable of achieving a maximum instantaneous acceleration of 25g, far greater than that achieved by any manmade vehicle. In order to understand the physical mechanisms behind achieving such high accelerations, we have built a mechanical fish to emulate the motion of a pike, a fast-start specialist. A live pike bends its body into either a C-shaped or an S-shaped curve and then uncoils it very quickly to send a traveling wave along its body in order to achieve high acceleration. We have designed a mechanical fish whose motion is accurately controlled by servo motors, to emulate the fast-start by bending its body to a curve from its original straight position, and then back to its straight position. Furthermore, this mechanical fish is designed to be adjustable in swimming pattern, tail shape, tail rigidity, and body rigidity, making it possible to study the influence of all of these parameters on the fast-start performance. Peak accelerations of 2.0 m/s2 and peak velocities of 0.09 m/s are measured. Although the maximum accelerations and velocities observed in our mechanical fish are smaller than those of live fish, the form of the measured acceleration signal as function of time is quite similar to that of a live fish. The hydrodynamic efficiencies are observed to be around 12%, and it is shown that the majority of the thrust is produced at the rear part of the mechanical fish — similarly to the live fish.
Starting Page	843
Ending Page	849
Page Count	7
File Format	PDF
ISBN	9780791854884
DOI	10.1115/IMECE2011-65035
Volume Number	Volume 2: Biomedical and Biotechnology Engineering; Nanoengineering for Medicine and Biology
Conference Proceedings	ASME 2011 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2011-11-11
Publisher Place	Denver, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Traveling waves Stiffness Shapes Signals Servomotors Thrust Vehicles
Content Type	Text
Resource Type	Article

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