Development of Improved Modeling and Analysis Techniques for Dynamics of Shell Structures
Final rept. 9 Jun 1987-9 Jun 1990
COLORADO UNIV AT BOULDER CENTER FOR SPACE STRUCTURES AND CONTROLS
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This report contains two related research thrusts improved shell structural modeling for underwater acoustics and massively parallel computations of shell dynamics response. Improvements on the existing ANS shell elements have been made and implemented on a testbed software the module was then delivered to NRL for their applications. In addition, the so-called frequency-window tailoring of finite element models has been developed so that very high- frequency components can be accurately modeled with relatively coarse finite element grids, thus resulting in about a factor of five to ten times larger element size than has been possible in conventional finite element modeling. Second, several parallel modules using the C language have been developed to run large-scale shell dynamics problems on the Connection Machines. These include decomposer which takes as input an arbitrary mesh description, and produces a set of finite element data structures that can be loaded within one generic CM2 chip mapper that assigns each of the data structures produced by the decomposer to a well defined chip residual evaluator that controls the direct calculation of element residuals element library that includes various finite elements and visualization kernel that greatly facilitates the understanding of the computed results.
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