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Complex Modal Decomposition Applied to Nematode Posturing

Feeny, B. F. and Sternberg, P. W. and Cronin, C. J. (2009) Complex Modal Decomposition Applied to Nematode Posturing. In: Proceedings of the ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference: IDETC/CIE 2009. American Society of Mechanical Engineers , New York, NY, pp. 247-254. ISBN 978-0-7918-4898-2 http://resolver.caltech.edu/CaltechAUTHORS:20131115-154737239

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Abstract

The complex orthogonal decomposition (COD), a process of extracting complex modes from complex ensemble data, is summarized, as is the use of complex modal coordinates. A brief assessment is made on how small levels of noise affect the decomposition. The decomposition is applied to the posturing of a wild Caenorhabditis elegans nematode. The decomposition indicates that the worm has a multi-modal posturing behavior, involving at least a dominant locomotion mode and a secondary, steering mode. The locomotion mode is closer to a pure traveling waveform than the steering mode. The characteristic wavelength of the primary mode was estimated in the complex plane. Frequency was obtained from the complex modal coordinate's complex whirl rate of the complex modal coordinate, and from its fast Fourier transform.


Item Type:Book Section
Additional Information:© 2009 ASME.
Record Number:CaltechAUTHORS:20131115-154737239
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20131115-154737239
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42510
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Nov 2013 03:58
Last Modified:16 Nov 2013 03:58

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