Download or read book Robustness of a Moving bank Multiple Model Adaptive Controller for a Large Space Structure written by Michael Roger Schore (CAPT, USAF.) and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Robustness of a Moving Bank Multiple Model Adaptive Controller for a Large Space Structure written by Michael R. Schore and published by . This book was released on 1989 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: The robustness of moving-bank multiple model adaptive estimation (MMAE) and control (MMAC) algorithms is analyzed in this thesis. The mismatch of a 24-state truth model and a 6-state filter model are evaluated on the basis of MMAE/MMAC performance. A model developed using finite element analysis is used to approximate a large space structure which has a large central hub with appendages radiating out from it. The mass of the hub is considered to be much larger than the mass of the flexible structure. The model is developed in physical coordinates and then transformed into modal coordinates. To obtain a reduced order filter model, the method of singular perturbations is used. The actual positions and velocities of various physical points on the structure are used in the evaluation of the MMAE/MMAC algorithm performance. The results of this study of model mismatching indicates that the MMAE provides accurate position and velocity estimates even in the face of a 6-state to 24-state model mismatch. When a non-adaptive filter is used with a mismatched parameter location, the performance suffers slightly. The use of an adaptive estimator does provide improved performance in the face of uncertain parameter location. Stable control was obtained with the use of MMAC. For the case of nonadaptive filter and mismatched parameter location, the control algorithm behaved in a possible destructive manner. By allowing the filter to adapt to the initial parameter location, the MMAC algorithm provided stable control of the structure, even in the face of large disturbances. (AW).

Download or read book A Robustness Analysis of Moving bank Multiple Model Adaptive Estimation and Control of a Large Flexible Space Structure written by Daniel F. Jr Van Der Werken (CAPT, USAF.) and published by . This book was released on 1988 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Robustness Analysis of Moving Bank Multiple Model Adaptive Estimation and Control of a Large Flexible Space Structure written by Daniel F Van Der Werken (Jr) and published by . This book was released on 1988 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: For this thesis, the truth model consists of 24 states, and the filter model consists of 6 states. The object is to determine whether or not the state mismatch between the filter and truth models seriously degrades or totally confounds the adaptation process. The system model used is a rotating two-bay flexible space structure, approximating a space structure that has a hub with extending appendages. The mass of the hub is greater than the mass of the appendage, and finite element analysis is used to develop the mathematical model. The system is developed in physical coordinates, transformed to modal coordinates, and the method of singular perturbations is used to provide a reduced filter model. The two dimensional parameter space consists of variations of the mass and stiffness matrices for the two-bay truss. Results indicate stable and accurate state estimation when the bank is initially centered on the true parameter. Stable control and accurate parameter estimation are not achieved. When the bank is initially centered at an incorrect parameter, stable and accurate state estimation is not demonstrated. These results indicate a total confounding of the adaptation process due to the unmodeled states, since accurate estimation and control can be generated when there are no such unmodeled states. Keywords: Kalman filters; Moving bank algorithms; Adaptive estimation; Multiple model adaptive control; Adaptive filters, Theses. (EDC).

Download or read book Large Space Structures Systems in the Space Station Era written by and published by . This book was released on 1990 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Large Space Structures Systems in the Space Station Era written by and published by . This book was released on 1990 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Large Space Structures and Systems in the Space Station Era written by and published by . This book was released on 1991-12 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Control of a Large Space Structure Using Multiple Model Adaptive Estimation and Control Techniques written by and published by . This book was released on 1993 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this thesis is to apply moving-bank multiple model adaptive estimation and control (MMAE/MMAC) algorithms to an actual space structure (SPICE) being examined at Phillips Laboratory at Kirtland AFB, NM. The structure consists of a large platform and a smaller platform connected by three legs in a tripod fashion. Kalman filtering and LQG control techniques are utilized as the primary design tool. Implementing a bank of filters increases the robustness of the LQG controller when uncertainties exist in the system model, whereas the moving bank is utilized to reduce the computational load. Several reduced-order models are developed from the truth model using modal analysis and modal cost analysis. The MMAE/MMAC design with a dramatically reduced-order filter model provides an excellent method to estimate a wide range of parameter variations and to quell oscillations in the structure. Multiple model adaptive estimation, Multiple model adaptive control, LQG Control, Flexible space structure, Parameter identification.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technology for Large Space Systems written by and published by . This book was released on 1990 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Space Station Systems written by and published by . This book was released on 1986 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Large Space Structures Systems in the Space Station Era written by John J. Ferrainolo and published by . This book was released on 1990 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multiple Model Approaches To Nonlinear Modelling And Control written by R Murray-Smith and published by CRC Press. This book was released on 2020-11-25 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents approaches to modelling and control problems arising from conditions of ever increasing nonlinearity and complexity. It prescribes an approach that covers a wide range of methods being combined to provide multiple model solutions. Many component methods are described, as well as discussion of the strategies available for building a successful multiple model approach.

Download or read book NASA SP written by and published by . This book was released on 1990 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technology for Large Space Systems A Bibliography with Indexes supplement 22 written by and published by . This book was released on 1990 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Automatic Control in Aerospace 1994 Aerospace Control 94 written by D. Schaechter and published by Elsevier. This book was released on 2014-05-23 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: An important, successful area for control systems development is that of state-of-the-art aeronautical and space related technologies. Leading researchers and practitioners within this field have been given the opportunity to exchange ideas and discuss results at the IFAC symposia on automatic control in aerospace. The key research papers presented at the latest in the series have been put together in this publication to provide a detailed assessment of present and future developments of these control system technologies.