A 15degrees of freedom lumped parameter vibratory model of human body is developed, for vertical mode vibrations, using anthropometric data of the 50th percentile US male. The mass and stiffness of various segments are determined from the elastic modulii of bones and tissues and from the anthropometric data available, assuming the shape of all the segments is ellipsoidal. The damping ratio of each segment is estimated on the basis of the physical structure of the body in a particular posture. Damping constants of various segments are calculated from these damping ratios. The human body is modeled as a linear spring-mass-damper system. The optimal values of the damping ratios of the body segments are estimated, for the 15degrees of freedom model of the 50th percentile US male, by comparing the response of the model with the experimental response. Formulating a similar vibratory model of the 50th percentile Indian male and comparing the frequency response of the model with the experimental response of the same group of subjects validate the modeling procedure. A range of damping ratios has been considered to develop a vibratory model, which can predict the vertical harmonic response of the human body.

1.
Bovenzi
,
M.
, and
Hulshof
,
C. T. J.
, 1998, “
An Updated Review of Epidemiologic Studies on the Relationships Between Exposure to Whole Body Vibration and Low Back Pain
,”
J. Sound Vib.
0022-460X,
215
(
4
), pp.
595
611
.
2.
Muskian
,
R.
, and
Nash
,
C. D.
, 1976, “
On Frequency Dependent Damping Coefficients in Lumped Parameter Model of Human Beings
,”
J. Biomech.
0021-9290,
9
, pp.
339
342
.
3.
Garg
,
P. D.
, and
Ross
,
M. A.
, 1976, “
Vertical Mode Human Body Vibration Transmissibility
,”
IEEE Trans. Syst. Man Cybern.
0018-9472,
SMC-6
(
2
), pp.
102
113
.
4.
Fairley
,
T. E.
, and
Griffin
,
M. J.
, 1989, “
The Apparent Mass of the Seated Human Body: Vertical Vibration
,”
J. Biomech.
0021-9290,
22
(
2
), pp.
81
94
.
5.
Pankoke
,
B. B.
, and
Woelfel
,
H. P.
, 1998, “
Dynamic FE Model of Sitting Man Adjustable to Body Height, Body Mass and Posture Used for Calculating Internal Forces in the Lumbar Vertebral Disks
,”
J. Sound Vib.
0022-460X,
215
(
4
), pp.
827
839
.
6.
Kitazaki
,
S.
, and
Griffin
,
M. J.
, 1997, “
A Modal Analysis of Whole-Body Vertical Vibration, Using a Finite Element Model of the Human Body
,”
J. Sound Vib.
0022-460X,
200
(
1
), pp.
83
103
.
7.
Matsumoto
,
Y.
, and
Griffin
,
M. J.
, 2003, “
Mathematical Models for the Apparent Masses of Standing Subjects Exposed to Vertical Whole-Body Vibration
,”
J. Sound Vib.
0022-460X,
260
, pp.
431
451
.
8.
Nigam
,
S. P.
, and
Malik
,
M.
, 1987, “
A Study on a Vibratory Model of Human Body
,”
ASME J. Biomech. Eng.
0148-0731,
109
(
2
), pp.
148
153
.
9.
Bartz
,
J. A.
, and
Gianotti
,
C. R.
, 1975, “
Computer Program to Generate Dimensional and Inertial Properties of the Human Body
,”
ASME J. Eng. Ind.
0022-0817,
97
, pp.
49
57
.
10.
Goldman
,
D. E.
, and
Von-Gierke
,
H. E.
, 1961, “
Effects of Shock and Vibration on Man
,” Chap. 44 of Shock and Vibration Handbook, Vol.
3
,
2nd ed.
,
C. M.
Harris
and
C. E.
Crede
, eds.,
McGraw Hill
,
New York
.
11.
McMohan
,
T. A.
, and
Green Petek
,
R.
, 1979, “
The Influence of Track Compliance on Running
,”
J. Biomech.
0021-9290,
12
, pp.
893
904
.
12.
Mizrahi
,
J.
, and
Susak
,
Z.
, 1982, “
In-vivo Elastic and Damping Response of the Human Leg to Impact Forces
,”
ASME J. Biomech. Eng.
0148-0731,
104
, pp.
63
66
.
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