MECHANICAL IMPEDANCE RESPONSE OF PROTOTYPE AND PRODUCTION ANTHROPOMORPHIC DUMMY HEADS.
A study was conducted to determine the mechanical impedance characteristics of a number of developmental dummy heads and to compare these data to existing mechanical impedance data for human cadaver heads. Five dummy heads were tested. Each head was mounted on an electromagnetic shaker and properly instrumented to obtain the following information over a frequency range of 30-5000 HZ: driving point impedance (DPI) at each of the following points: forehead; side of the head; and back of the head. Transfer point impedance (TPI) at the following Points: center of gravity (CG) of the head; and side of the skull at the point opposite the driving point. The DPI of each dummy head in each direction was compared to the DPI of fresh unembalmed cadavers tested in a similar manner.