Abstract
A technology to study the sensitivity of impact responses to prescribed test conditions is presented. Motor vehicle impacts are used to illustrate the principles of this sensitivity technology. Impact conditions are regulated by specifying either a corridor for the acceleration time history or other test parameters such as velocity change, static crush distance, and pulse duration. By combining a time domain constrained optimization method and a multirigid body dynamics simulator, the upper and lower bounds of occupant responses subject to the regulated corridors were obtained. It was found that these prescribed corridors may be either so wide as to allow extreme variations in occupant response or so narrow that they are physically unrealizable in the laboratory test environment. A new corridor based on specifications for the test parameters of acceleration, velocity. crush distance, and duration for frontal vehicle impacts is given.
Highlights
If the acceleration of the occupant's chest is selected as the critical response whose peak value is minimized when the deceleration profile is aCt), the chest acceleration calculated from the system model with input aU) is called the best chest acceleration
The best and worse disturbance analysis methodology was applied to the problem of determining practical guidelines for defining deceleration corridors for impact tests
Sensitivity of over 140% was shown among test conditions within a selected corridor using only these specifications
Summary
Such as the chest acceleration of an occupant, is called the best disturbance This minimization is subject to inequality or equality constraints, for example, upper and lower bounds on the deceleration of the sled or the velocity change for the simulated crash. If the acceleration of the occupant's chest is selected as the critical response whose peak value is minimized when the deceleration profile is aCt), the chest acceleration calculated from the system model with input aU) is called the best chest acceleration. A formulation that is applicable to the response sensitivity analyses of structures under impact loading was given by Pilkey and colleagues (1993) An outline of this method is given here.
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