A four of freedom mathematical model was developed to describe the effects of varying helmet weight and center-of-gravity (CG) on the vibration characteristics of the head-neck-helmet system. The model consists of two pivot points connected by a system of rotational springs. Experimental data, collected from six subjects exposed to single- and multiple-axis vibration while wearing a variable weight/variable CG helmet, was used to determine rotational spring coefficients. Data from a simplified model was compared to experimental head-neck motion data to illustrate the change in head-neck motion data to illustrate the change in head-neck-helmet motion due to the change in helmet weight and CG. Eventual optimization of the mathematical model will produce a useful tool to predict changes in pilot head-neck motion due to changes in helmet design.
Effects of helmet weight and center-of-gravity on the vibratory dynamics of the head-neck system: A modelling approach
Einfluesse des Helmgewichtes und des Schwerpunktes auf die Schwingungsdynamik des Kopf-Hals-Systems: Eine Modellmethode
Proc. of the 4th Int. Modal Analysis Conf., Union College-Schenectady ; 2 , Feb ; 1201-1205
1986
5 Seiten, 3 Bilder, 2 Tabellen, 9 Quellen
Conference paper
English
Biodynamic simulations of helmet mass and center-of-gravity effects
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