Abstract
The human head-neck is the most complex structure in the human body and its behavior under vibration remain poorly understood. Therefore, a comprehensive theoretical or experimental analysis is needed. This study is mainly based on an available finite element human head-neck complex and concentrates on its modal and dynamic responses. Resonance frequencies and responses of the human head-neck complex’s finite element model in impact simulations have been analyzed. These dynamic responses show a very good agreement with the previous studies. The fundamental frequency of modal analysis of finite element model is 35.25 Hz which is reasonably close to existing literatures. However, our modal dynamic analysis of an elaborated human head-neck complex introduces supplementary dynamic responses like nasal sideward cartilages’ “flipping” modes and the mandible’s “mastication” modes. Modal validation is performed which indicates a requirement for elaborated modeling to make out all the extra resonance frequencies. Moreover, the influence of damping factor on biomechanical response or natural frequencies is also investigated. It can be found that damping factor has got an inverse proportionality between damping factor effect on natural frequency and that on biomechanical responses. This demonstrates the significance of identification of the suitable damping factor evaluating biomechanical response in modal dynamic analysis and validation.
Highlights
When exposed to shock and vibration either in acoustic domain or keeping in touch with vibratory continuous constructions
From modal dynamic analysis we can know that the head-neck finite element model is obedient to the back-to-front bending in axial rotation of the first two modes
The fundamental natural frequency which has been acquired from modal analysis and compared with those that were found in reported documents is one of the significant dynamic characteristics, Because of the difference in the sections involved, the reported fundamental frequencies, differ widely across literatures; from the few thousands for skull-only studies to the few hundred hertz in studies accounting for the brain
Summary
When exposed to shock and vibration either in acoustic domain or keeping in touch with vibratory continuous constructions. “two two-dimensional midsaggital head-neck models (one with brain; one with a hollow skull)” was built by Chu et al [15] and found the extra brain reduced the cardinal spectrum from 286 Hz to 119 Hz. The head’s models were presented by these studies merely until lately, while Charalambopoulos et al [2] built an analytic detailed head-neck complex and discovered that the neck brought in extra spectrum domain with the resonance frequency of 595 Hz. Afterwards, Meyer et al [16]’s finite element simulations that used a head-neck system illustrated that the head-neck model’s fundamental frequency was 3.01 Hz. Recently, Baroudi et al [17] executed a three-dimensional modal dynamic analysis of a simplified cylindrical skull-brain-CSF model utilizing both analytic and finite element approaches and discovered the principle spectrum for that is 26.66 Hz. A number of perceptions had been offered by these previous finite element studies in the human head-neck’s modal and dynamic responses. Damping factor’s influence on dynamic properties is likewise investigated, a few damping factors are introduced in the matrix eigenvalue and eigenvector analyses, differ from most former finite element analysis using the extraction approach of fundamental frequency
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
