| Modelling Helicopter Radar Backscatter |
JUN 2011 |
36 pages |
| Authors:
R. Melino; C. Bourne; H. T. Tran; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) ELECTRONIC WARFARE AND RADAR DIVISION
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 | This paper presents a study on the simulation of the radar backscatter signal from a helicopter in which the helicopter rotors, the helicopter rotor hub and helicopter body are modelled by an ensemble of straight wires, rods and rectangular plates in various orientations. Despite the simplicity of exact solutions used here, which give a signi cant advantage of very low computational cost, very good agreement with real data can be ... |
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| An SDRE Based Estimator Approach for HIV Feedback Control |
24 APR 2004 |
31 pages |
| Authors:
H. T. Banks; Hee-Dae Kwon; J. A. Toivanen; H. T. Tran; AIR FORCE OFFICE OF SCIENTIFIC RESEARCH ARLINGTON VA
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| We consider optimal dynamic multidrug therapies for human immunodeficiency virus (HIV) type I infection. In this context we describe an optimal tracking problem attempting to drive the states of the system to a stationary state in which the viral load is low and the immune response is strong. We consider optimal feedback control with full state as well as with partial state measurements. In the case of partial state measurement, ... |
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| State Estimation and Tracking Control of Nonlinear Dynamical Systems |
2000 |
24 pages |
| Authors:
S. C. Beeler; H. T. Tran; H. T. Banks; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MATHEMATICS
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| In this paper state estimation and feedback tracking control methods for nonlinear systems are presented. The methods, which are based on the "state-dependent Riccati equation", allow the construction of nonlinear estimators and nonlinear feedback tracking controls for a wide class of systems. Our emphasis will be on development of computational methods that are easily implementable as well as efficient. Simulation results of the performance of the nonlinear estimator and tracking ... |
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| Reduced Order Modeling and Control of Thin Film Growth in an HPCVD Reactor |
2000 |
32 pages |
| Authors:
S. C. Beeler; G. M. Kepler; H. T. Tran; H. T. Banks; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
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| Reduced Order Based Compensator Control of Thin Film Growth in a CVD Reactor |
2000 |
18 pages |
| Authors:
H. T. Banks; H. T. Tran; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
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| Surface Reaction Kinetics of Ga(1-x)In(x)P Growth During Pulsed Chemical Beam Epitaxy |
2000 |
17 pages |
| Authors:
N. Dietz; S. C. Beeler; J. W. Schmidt; H. T. Tran; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
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| The understanding of thin film growth processes and their control requires the development of surface-sensitive real-time optical characterization techniques that are able to provide insight into the surface reaction kinetics during an organometallic deposition process. These insights will allow us to move the control point closer to the point where the growth occurs, which in a chemical been epitaxy process is a surface reaction layer (SRL), built up of physisorbed ... |
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| Compensator Control for Chemical Vapor Deposition Film Growth Using Reduced Order Design Models |
1999 |
30 pages |
| Authors:
G. M. Kepler; H. T. Tran; H. T. Banks; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
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| We present a summary of investigations on the use of proper orthogonal decomposition (POD) techniques as a reduced basis method for computation of feedback controls and compensators in a high pressure chemical vapor deposition (HPCVD) reactor that includes multiple species and controls, gas phase reactions, and time dependent tracking signals that are consistent with pulsed vapor reactant inputs. Numerical implementation of the model-based feedback control uses a reduced order state ... |
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| Reduced Order Model Compensator Control of Species Transport in a CVD Reactor |
1999 |
23 pages |
| Authors:
G. M. Kepler; H. T. Tran; H. T. Banks; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
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| Proper Orthogonal Decomposition Based Control of Transverse Beam Vibrations: Experimental Implementation |
1999 |
22 pages |
| Authors:
R. C. Del Rosario; H. T. Tran; H. T. Banks; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
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| LQG compensator control of transverse vibrations was implemented on an aluminum cantilevered beam in a "smart structure" paradigm. The beam was mounted with two self-sensing, self-actuating piezoceramic patches. The Euler-Bernoulli beam equation was discretized via a Galerkin type approximation (referred to as the full order model). To reduce the size of the resulting finite dimensional approximating system, the Proper Orthogonal Decomposition (POD) was employed as a reduced basis method. A ... |
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