Conventional and complex modal analyses of a finite element model of human head and neck

This study employs both the traditional and the complex modal analyses of a detailed finite element model of human head-neck system to determine modal responses in terms of resonant frequencies and mode shapes. It compares both modal responses without ignoring mode shapes, and these results are reas...

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Bibliographic Details
Published in:Computer methods in biomechanics and biomedical engineering 2015-07, Vol.18 (9), p.961-973
Main Authors: Tse, Kwong Ming, Tan, Long Bin, Lim, Siak Piang, Lee, Heow Pueh
Format: Article
Language:English
Subjects:
complex frequency
damping factor
finite element
head-neck
mode shape
natural frequency
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Summary:This study employs both the traditional and the complex modal analyses of a detailed finite element model of human head-neck system to determine modal responses in terms of resonant frequencies and mode shapes. It compares both modal responses without ignoring mode shapes, and these results are reasonably in agreement with the literature. Increasing displacement contour loops within the brain in higher frequency modes probably exhibits the shearing and twisting modes of the brain. Additional and rarely reported modal responses such as 'mastication' mode of the mandible and flipping mode of nasal lateral cartilages are identified. This suggests a need for detailed modelling to identify all the additional frequencies of each individual part. Moreover, it is found that a damping factor of above 0.2 has amplifying effect in reducing higher frequency modes, while a diminishing effect in lowering peak biomechanical responses, indicating the importance of identifying the appropriate optimised damping factor.
ISSN:1025-5842
1476-8259
DOI:10.1080/10255842.2013.864641