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Ogden, Jerry Scott (PhD, Engineering and Applied Sciences) Generalized Deformation and Total Velocity Change Analysis System of Equations (G-DaTADeltaV?) Thesis directed by Professor Bruce Janson ABSTRACT Current methods for analyzing motor vehicle deformation utilize a force-deflection analysis for determining deformation work energy, which relies on vehicle-specific structural stiffness coefficients determined from full-scale impact testing. While the current database is quite extensive for frontal stiffness values for passenger cars and many light trucks, vans and SUVs from the 1970?s up to modern day, the database is devoid of specific crash tests needed for deformation analysis of rear and/or side structures of many vehicles. Additionally, there exists very few structural stiffness coefficients for heavy commercial vehicles, buses, recreational vehicles, heavy equipment or motorcycles necessary for application with the current force-deflection analysis methods. The primary goal of this research is to develop an accurate, reliable and broadly applicable deformation analysis method that requires the structural stiffness coefficients for only one collision involved vehicle. The developed methodology expands the application of deformation analysis to include unconventional vehicles and other objects and surfaces not supported by the current structural stiffness coefficient database. The G-DaTADeltaV? System of Equations incorporates linear and rotational effects, as well as impact restitution resulting from conservative forces acting during a given collision impulse. Additionally, the G-DaTADeltaV? System of Equations accounts for tire-ground forces and inter-vehicular friction, non-conservative force contributions acting on the collision system that are commonly present during offset and oblique non-central collision configurations. Correlation and descriptive statistics, as well as the raw analysis results, indicate a highly reliable and significantly improved degree of precision and accuracy achieved through the application of the G-DaTADeltaV? System of Equations when determining vehicular total velocity changes for oblique and offset non-central impacts. The form and content of this abstract are approved. I recommend its publication. Approved: Bruce Janson |
