Inversion of ringdown data for a rotating liquid cylinder
Abstract
Disturbance pressure data from both numerical and gyroscope experiments on ringdown of inertial waves were fitted to a sum of complex exponentials using a linearized least squares method. For the numerical experiments, frequencies and decay rates agreed with those predicted by eigenvalue calculations to within a few percent. Eigenfrequencies calculated from gyroscope data agreed with prediction to within 2% while all decay rates were greater than predicted, some by as much as 65%. An autoregressive method was developed and tested on both simulated and real data. At its present stage of development this approach was found to be inferior to the least squares method.
- Publication:
-
Final Report Ballistic Research Labs
- Pub Date:
- September 1983
- Bibcode:
- 1983brla.reptQ....A
- Keywords:
-
- Inversions;
- Rotating Cylinders;
- Sine Waves;
- Computerized Simulation;
- Decay Rates;
- Eigenvalues;
- Gyroscopes;
- Least Squares Method;
- Mathematical Models;
- Pressure Measurement;
- Fluid Mechanics and Heat Transfer