
Accession Number : AD0738533
Title : Effect of Grid Size on Cutoff Frequency in the Numerical Solution of an Elastic OneDimensional Wave Propagation Problem.
Descriptive Note : Final rept.,
Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
Personal Author(s) : Hadala,Paul F. ; Taylor,Hugh M. , Jr
Report Date : FEB 1972
Pagination or Media Count : 56
Abstract : The Waterways Experiment Station onedimensional (1D) finite difference ground motion calculation code was used to investigate the influences of grid size and acceleration convergence criteria on cutofffrequency phenomena in the numerical solution of an elastic 1D wave propagation problem. Rise time to peak stress or particle velocity was shown to increase with increaaed grid size. In addition, the coarser the grid, the greater will be the overshoot of peak stress and velocity. Increasing AMIN, the acceleration convergence error tolerance in the code's numerical integration scheme, had a significant effect on the amplitudes but not the frequency of the oscillations that occurred in the 1D elastic finite difference computer code calculations. (Author)
Descriptors : (*SEISMIC WAVES, *BOUNDARY VALUE PROBLEMS), (*NUCLEAR EXPLOSIONS, SEISMIC WAVES), DIFFERENCE EQUATIONS, SHOCK WAVES, MATHEMATICAL MODELS, NUMERICAL INTEGRATION, CURVE FITTING, GRAPHICS, NUMERICAL ANALYSIS, AIRBURST
Subject Categories : Seismology
Numerical Mathematics
Distribution Statement : APPROVED FOR PUBLIC RELEASE