Optimum Shock Isolation for Underground Protective Structures.
Technical rept. Apr 68-Dec 69,
MECHANICS RESEARCH INC LOS ANGELES CA
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The objectives of this study were to extend the mathematical techniques involved in optimum shock isolation system analysis to analyze a three-degree-of-freedom system to determine the control parameters necessary and desirable in active shock isolation system and to investigate several input shock waves to determine the factors influencing optimum shock isolation system design criteria and control functions. The first two objectives were accomplished. However, additional parametric studies will have to be performed before achieving the third objective. Linear programming techniques were selected for optimizing the active three-degree-of-freedom isolation system. The system was optimized on a basis of minimizing the maximum value of the response acceleration for an allowable relative displacement. To determine how much improvement can be obtained from an active isolation system as compared to a passive one, a linear and a nonlinear passive three-degree-of-freedom system were also analyzed. The shock isolation systems were subjected to vertical andor horizontal shock forces. Preliminary results indicated that the best performance is always obtained with the active system. It was tentatively concluded that optimum performance can always be obtained without rotation of the isolated mas with the active system. This would indicate that further parametric studies of the active system could be restricted to the single-degree-of-freedom model resulting in considerable savings in time and effort. This conclusion can probably be extended to a general active six-degree-of-freedom shock isolation system. Author
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