Index Terms-Negative imaginary systems, flexible structures, subspace system identification.Abstract-The negative imaginary (NI) property occurs in many important applications. For instance, flexible structure systems with collocated force actuators and position sensors can be modeled as negative imaginary systems. Obtaining a mathematical model for this class of systems using system identification methods may result into inaccurate models that poorly reflect the negative imaginary property. In this paper, a modified subspace system identification algorithm that ensures the negative imaginary property is presented. As an application of these results, an example of modeling a flexible system with a piezoelectric actuator and position sensor is presented.
53rd IEEE Conference on Decision and Control
The present study was designed to give a clear and comprehensive understanding of the structural situation in the Sohag region and surrounding area by applying several edge detectors to aeromagnetic data. In this research, the International Geomagnetic Reference Field (IGRF) values were removed from the aeromagnetic data and the data obtained were then reduced to the north magnetic pole (RTP). A combination of different edge detectors was applied to determine the boundaries of the magnetic sources. A good correlation was noticed between these techniques, indicating that their integration can contribute to delineating the structural framework of the area. Consequently, a detailed structural map based on the results was constructed. Generally, E-W, N45-60E, and N15-30W directions represent the main tectonic trends in the survey area. The structural map shows the existence of two main basins constituting the most probable places for hydrocarbon accumulation. The results of this study provide structural information that can constitute an invaluable contribution to the gas and oil exploration process in this promising area. They show also that the decision in choosing the location of the drilled boreholes (Balyana-1 and Gerga) was incorrect, as they were drilled in localities within an area of a thin sedimentary cover.
The main purpose of the present study is to identify the surface and subsurface structural features and configuration of the basement in the area around Sohag Governorate using Geographic Information System (GIS) and potential field data (gravity and aeromagnetic). The hill shade was found as the most suitable image for surface lineament delineation and to produce a fault potential prediction map using the overlay model technique. The subsurface faults and contacts were detected and traced out from the reduced to the pole (RTP) magnetic, Bouguer gravity anomaly, and tilt derivative maps. The basement structural map of study area has been created based on tilt derivative technique. The structural tectonic maps show that the E-W, NNW-SSE, and NNE-SSW directions are the main trends affecting the study area. The subsurface configuration of the basement was detected using two dimensional (2D) gravity and magnetic forward modeling along preselected six long profiles crossing the study area. The 2D models suggest a depth range to the basement of 400 to 4000 m.
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