Exploring Biodynamic Response (Apparent Masses) of a Seated Human Body Exposed To External Excitation in Vertical Direction

The injuries inflicted on a human body are due to the impact of vibrations. In the present work, the biodynamic response behaviors of seated human body subject to vibration in the vertical direction have been extensively examined. The biodynamic response parameter of seated human body has been analyzed in terms of apparent mass (AM). The AM describe “to –the -body” force motion relationship at the interface of human and seat. The present work proposed the six degrees of freedom (6-DOF) analytic biodynamic model of the seated human posture with the backrest in the vertical vibration direction to study the biodynamic response of various masses, stiffnesses, and the damping coefficients. Field test was carried out using a TATA Nanocar to verify the vibrational comfort. The tests were carried out on different surfaces and at different speeds. Acceleration was measured on both seat and head. This paper helps analyze and provide the vibrational comfort to the car driver and the passengers in different road conditions. The present work helps the researchers worldwide to study and analyze the impact of mass, stiffness, and the damping coefficient on the apparent mass.