In this study, adding a headrest to the conventional vehicle driver seat is investigated to improve the driver comfort
and decrease the driver damages. For this purpose, a conventional biomechanical human body model of wholebody vibrations is provided and modified by adding a head degree of freedom to the body model and a headrest to
the seat model. The basic model is in the sitting posture, lumped parameters and has nine DOFs for the human body,
on contrary to the proposed model which has ten DOFs. The new human body DOF is the twisting motion of the
head and neck. This new DOF is generated because of headrest adding to the driver’s seat. To determine the head
discomforts, the Seat to Head (STH) indexes are studied in two directions: horizontal and vertical. The Genetic
Algorithm (GA) is used to optimize the STH in different directions. The optimization variables are stiffness and
damping parameters of the driver’s seat which are 12 for the basic model and are 16 for a new seat. The integer
programming is used for time reduction. The results show that new seat (equipped by headrest) has very better
STH in both directions.
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