Modeling Biodynamic Effects of Vibration. Fifth Year
Final scientific rept.
SYSTEMS TECHNOLOGY INC HAWTHORNE CA
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The biomechanical feedthrough of vertical andor fore-aft vibration from a seat, to and through various parts of the torso, limbs, hands, and head, to a spring-restrained control stick has been modeled over a 5-year effort using prior Air Force and other data bases. This final report summarizes the project results and provides a Users Guide to BIODYN-78, an interactive, remote-access, digital computer program for exercising the model. The model involves 77 postural and physiological parameters to define a broad range of seatingcontroldisplay arrangements from supine to erect. An internal routine automatically trims the TorsoHeadLimb system at the desired angles and computes linearized equations of motion, which are solved for their eigenvalues and resulting transfer functions using highly refined computing routines. In distinction from most past models, this model represents several degrees-of-freedom simultaneously, e.g., vertical and foreaft shoulder motion, angular head-bobbing, constrained elbow motion, stick-grip-interface force, muscle forces, and stick angular motion, among many others.
- Human Factors Engineering and Man Machine Systems