A study of the response of human body subjected to vibration/shock

Statement: 

A study of the response of human body subjected to vibration/shock is important in many applications. In a standing posture, the masses of head, upper torso, hips and legs and the elasticity/damping of neck, spinal column, abdomen, and legs influence the response characteristics. Develop a sequence of three improved approximations for modeling the human body.

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Solution: 

When we study the human body, it subjects to vibrations or shock which is necessary in many applications. Standing posture of any human body consist the influence of mass of head, upper torso,
hips and legs and damping of neck, spinal column, legs and abdomen. On basis of this various approximations of models are mentioned further.
(1) The first model can be -

(2) Second model can be -

(3) Approximation of third model for this case is -

Thereby, the above-mentioned models describe the developed sequence of improved approximations for human body.