Accession Number : AD0486834

Title :   OPTIMAL SHOCK ISOLATION SYNTHESIS.

Descriptive Note : Technical rept. Jun 64-Jun 66,

Corporate Author : IIT RESEARCH INST CHICAGO IL

Personal Author(s) : Liber, Theodore

Report Date : JUL 1966

Pagination or Media Count : 122

Abstract : The objectives of this study were to determine if the response of a single-degree-of-freedom active shock isolation system provides a substantial improvement over that of a conventional single-degree-of-freedom passive shock isolation system, and to determine what control parameters are necessary and desirable in active shock isolation. The best possible shock motions and its performance was compared to an optimized passive system. Four techniques were employed in the analysis of the optimal systems; dynamic programming, linear programming, a simple graphical procedure, and direct integration. The above methods were also used to construct what we have chosen to call a tradeoff limit diagram, which relates, in nondimensional form, the maximum mass acceleration with the rattlespace required for the optimum isolation systems as well as for any other system under consideration. As is demonstrated, this diagram provides the designer with the tool for a rational comparison of the performance of any isolation system with that of the best possible. Thus, from it, the designer can assess the practical utility of trying to improve the performance of any given concept or to search for other designs which would approach or actually duplicate the performance of the best possible system. The the typical shock input wave forms investigated, the superiority of the active system was quite evident. Furthermore, the performance of the optimal active system has been found to be insensitive to the wave shape details of the input. This was not true for the optimal passive system considered. (Author)

Descriptors :   *OPTIMIZATION), (*VIBRATION ISOLATORS, SHOCK(MECHANICS), PERFORMANCE(ENGINEERING), SHOCK ABSORBERS, LINEAR PROGRAMMING, PROGRAMMING LANGUAGES, DYNAMIC PROGRAMMING, NUMERICAL ANALYSIS, FUNCTIONS(MATHEMATICS), SHOCK WAVES, SYNTHESIS.

Subject Categories : Numerical Mathematics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE