naa a22 4500 510774296 CHVBK 20180411083225.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s40295-015-0060-2 doi (NATIONALLICENCE)springer-10.1007/s40295-015-0060-2 Realization of State-Space Models for Wave Propagation Simulations [Elektronische Daten] [Stephen Ketcham, Minh Phan, Richard Darling, Mihan McKenna] Fully three-dimensional numerical solutions can quantify exterior seismic or acoustic propagation throughout complex geologic or atmospheric domains. Results from impulsive sources typically reveal propagating waves plus reverberations due to multi-path scattering and wave-guide behavior, with decay toward quiescent motions as the dominant wave energy moves out of the domain. Because such computations are expensive and yield large data sets, it is advantageous to make the data reusable and reducible for both direct and reciprocal simulations. Our objective is efficient time-domain simulation of the wave-field response to sources with arbitrary time series. For this purpose we developed a practical and robust technique for superstable model identification. A superstable model has the form of a state-space model, but the output matrix contains the system dynamics. It simulates propagation with the fidelity of the pulse response calculated for the numerical system. Our development of the superstable technique was motivated by our initial application of the Eigensystem Realization Algorithm to wave-field systems from high-performance-computing analyses, where we recognized exterior propagation features allowing superstable model assignment. Most importantly the pulse response and its decay over the domain are captured in a finite duration, and decay to zero beyond a finite number of time steps implies a system with zero eigenvalues. We review the superstable identification technique and demonstrate in detail infrasonic propagation system identification with pulse response data derived from supercomputer analysis. We conclude that, using superstable-identified systems, we are able to create reusable and reducible propagation-system models that accurately simulate the wave field using a fraction of the original computational resources. American Astronautical Society (Outside the U.S.), 2015 Superstable nationallicence State space nationallicence Identification nationallicence Realization nationallicence Infrasound nationallicence Propagation nationallicence Supercomputer nationallicence Wave field nationallicence Simulations nationallicence Pulse response nationallicence Reduced order model nationallicence Ketcham Stephen Signature Physics Branch, Cold Regions Research and Engineering Laboratory, U.S. Army Engineer Research and Development Center, 72 Lyme Rd., 03755, Hanover, NH, USA aut Phan Minh Thayer School of Engineering, Dartmouth College, 14 Engineering Drive, 03755, Hanover, NH, USA aut Darling Richard Signature Physics Branch, Cold Regions Research and Engineering Laboratory, U.S. Army Engineer Research and Development Center, 72 Lyme Rd., 03755, Hanover, NH, USA aut McKenna Mihan Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, 39180, Vicksburg, MS, USA aut The Journal of the Astronautical Sciences Springer US; http://www.springer-ny.com 60/3-4(2013-12-01), 607-622 0021-9142 60:3-4<607 2013 60 40295 https://doi.org/10.1007/s40295-015-0060-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s40295-015-0060-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ketcham Stephen Signature Physics Branch, Cold Regions Research and Engineering Laboratory, U.S. Army Engineer Research and Development Center, 72 Lyme Rd., 03755, Hanover, NH, USA aut NATIONALLICENCE 700 1- Phan Minh Thayer School of Engineering, Dartmouth College, 14 Engineering Drive, 03755, Hanover, NH, USA aut NATIONALLICENCE 700 1- Darling Richard Signature Physics Branch, Cold Regions Research and Engineering Laboratory, U.S. Army Engineer Research and Development Center, 72 Lyme Rd., 03755, Hanover, NH, USA aut NATIONALLICENCE 700 1- McKenna Mihan Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, 39180, Vicksburg, MS, USA aut NATIONALLICENCE 773 0- The Journal of the Astronautical Sciences Springer US; http://www.springer-ny.com 60/3-4(2013-12-01), 607-622 0021-9142 60:3-4<607 2013 60 40295 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer