Accession Number : AD0738533

Title :   Effect of Grid Size on Cutoff Frequency in the Numerical Solution of an Elastic One-Dimensional 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 one-dimensional (1D) finite difference ground motion calculation code was used to investigate the influences of grid size and acceleration convergence criteria on cutoff-frequency 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