A method to distinguish between structural and computational modes for modal data estimated with oversized least squares time domain models is developed. The method is based on the convergence and stationarity of the z-plane poles as the algorithm processes subsequent points of the time domain arrays. A convergence factor is developed to quantitatively assess the pole stationarity. The utility of the method is evaluated with both simulated and experimental data. The results show that the observation of the convergence factor can greatly aid in the separation of the structural from the computational modes.
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Signal Processing
- Civil and Structural Engineering
- Aerospace Engineering
- Mechanical Engineering
- Computer Science Applications