A Mathematical Model for a Vibrating Human Head

A Mathematical Model for a Vibrating Human Head

J. C. Misra (Indian Institute of Technology, India), S. Dandapat (Indian Institute of Technology, India) and S. Adhikary (SOA University, India)
Copyright: © 2010 |Pages: 14
DOI: 10.4018/jalr.2010040103

Abstract

In this paper, a mathematical model has been formulated to study the vibration of the human head. In the mathematical analysis of the model, the skull is considered as an anisotropic spherical shell and brain matter is represented as an inviscid compressible fluid. Also, in the model, the translational acceleration is considered as a general function of time. The authors use the method of Laplace transformation to achieve the analytical solution of the problem, while the analytical expressions have been used to compute the stress distribution in the system by resorting to numerical techniques.
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1 Introduction

It is well-known that about three quarters of the total number of deaths resulting from various types of accidents involve serious injuries to the head in general and to the brain matter in particular. This indicates the gravity of the problem of head injury. In the past a few investigations (experimental as well as theoretical) have been performed by different researchers in order to explore various information that are useful from the physiological as well as pathological point of view. Some of the derived information on the axisymmetric vibration of head are also quite helpful in the design and construction of improved protective gears for the human head.

For an analytical study in this area, one has to largely dwell upon studies based upon modelling of the structure of head. It is needless to emphasize on the consideration of a proper model in the sense that the model should represent the real structure of the head as nearly as possible. At the same time, care should also be taken so that the assumed mechanical properties of the different components of the structure should be in the conformity to the observations of the relevant experimental investigations (Table 1).

Table 1.
Nomenclature
jalr.2010040103.m01Spherical polar co-ordinates
jalr.2010040103.m02Non-dimensional radius
jalr.2010040103.m03Outer radius of the skull
jalr.2010040103.m04Radius of the interface between the skull and the brain
jalr.2010040103.m05Velocity of compressional wave of the skull medium
jalr.2010040103.m06Velocity of pressure wave in the brain mass
jalr.2010040103.m07Applied external force
jalr.2010040103.m08Normal stress components
jalr.2010040103.m09Shearing stress components
jalr.2010040103.m10Normal strains
jalr.2010040103.m11Shearing strains
jalr.2010040103.m12Pressure of the brain
jalr.2010040103.m13Frequency
jalr.2010040103.m14Time
jalr.2010040103.m15Displacement in jalr.2010040103.m16 directions
jalr.2010040103.m17Non-dimensional density
jalr.2010040103.m18Density of the brain and skull material respectively
jalr.2010040103.m19Velocity potential of brain
jalr.2010040103.m20Lame's constants

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