Extended active disturbance rejection controller

Multiple designs, systems, methods and processes for controlling a system or plant using an extended active disturbance rejection control (ADRC) based controller are presented. The extended ADRC controller accepts sensor information from the plant. The sensor information is used in conjunction with an extended state observer in combination with a predictor that estimates and predicts the current state of the plant and a co-joined estimate of the system disturbances and system dynamics. The extended state observer estimates and predictions are used in conjunction with a control law that generates an input to the system based in part on the extended state observer estimates and predictions as well as a desired trajectory for the plant to follow

Extended Active Disturbance Rejection Controller

Multiple designs, systems, methods and processes for controlling a system or plant using an extended active disturbance rejection control (ADRC) based controller are presented. The extended ADRC controller accepts sensor information from the plant. The sensor information is used in conjunction with an extended state observer in combination with a predictor that estimates and predicts the current state of the plant and a co-joined estimate of the system disturbances and system dynamics. The extended state observer estimates and predictions are used in conjunction with a control law that generates an input to the system based in part on the extended state observer estimates and predictions as well as a desired trajectory for the plant to follow

Research conducted at the Institute for Computer Applications in Science and Engineering in applied mathematics, numerical analysis and computer science

This report summarizes research conducted at the Institute for Computer Applications in Science and Engineering in applied mathematics, numerical analysis, and computer science during the period April l, 1988 through September 30, 1988

Proceedings of the 3rd Annual Conference on Aerospace Computational Control, volume 1

Conference topics included definition of tool requirements, advanced multibody component representation descriptions, model reduction, parallel computation, real time simulation, control design and analysis software, user interface issues, testing and verification, and applications to spacecraft, robotics, and aircraft

The Fifth NASA/DOD Controls-Structures Interaction Technology Conference, part 2

This publication is a compilation of the papers presented at the Fifth NASA/DoD Controls-Structures Interaction (CSI) Technology Conference held in Lake Tahoe, Nevada, March 3-5, 1992. The conference, which was jointly sponsored by the NASA Office of Aeronautics and Space Technology and the Department of Defense, was organized by the NASA Langley Research Center. The purpose of this conference was to report to industry, academia, and government agencies on the current status of controls-structures interaction technology. The agenda covered ground testing, integrated design, analysis, flight experiments and concepts

A Scaling Methodology for Dynamic Systems: Quantification of Approximate Similitude and Use in Multiobjective Design.

A design technique that adapts or scales a system design to meet new requirements is developed. This scaling technique is potentially useful because it focuses on retaining existing desirable characteristics (e.g., efficiency, stability) of the original design through minimal modifications. Previous work in the literature explored this notion by developing scaling techniques based on the dynamic similitude principle. However, such similitude-based scaling is often found too restrictive because it may not be feasible to satisfy all of the scaling laws designated by the similitude principle exactly. Moreover, the literature only defines such similitude discretely in terms of whether the scaled design satisfies these scaling laws. This definition then makes it impossible to assess the degree to which two designs are close to satisfy similitude. The work in this dissertation mitigates these difficulties as follows: First, it uses a novel combination of activity-based model reduction and dimensional analysis to assess the relative importance of each scaling law and permit neglecting the least important ones, thereby providing more freedom than strict similitude-based scaling. Next, a metric is developed to cope with the situation in which the most important scaling law(s) cannot be followed due to other conflicting requirements and constraints. This metric allows one to quantify approximate similitude, that is, the degree to which the scaled design is close to satisfying the discrete definition of exact similitude. Then, this quantification is utilized in a multiobjective scaling framework that trades off approximate similitude versus the conflicting requirements and constraints. The applicability of the methodology is demonstrated through three case studies. The first study applies the methodology to a linear quarter-car system to scale the chassis vibrations. The second study scales a fuel cell’s nonlinear air supply system subject to different power requirements. The last case study represents a scaling design study of a complex multi-body dynamic vehicle design to maintain rollover safety properties when subject to extra roof-top loads. These examples demonstrate that the proposed method does provide a systematic, computationally efficient approach to redesign as compared with casting the redesign as an optimization problem.Ph.D.Mechanical EngineeringUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/58383/1/burit_1.pd

International Symposium on Magnetic Suspension Technology, Part 1

The goal of the symposium was to examine the state of technology of all areas of magnetic suspension and to review related recent developments in sensors and controls approaches, superconducting magnet technology, and design/implementation practices. The symposium included 17 technical sessions in which 55 papers were presented. The technical session covered the areas of bearings, sensors and controls, microgravity and vibration isolation, superconductivity, manufacturing applications, wind tunnel magnetic suspension systems, magnetically levitated trains (MAGLEV), space applications, and large gap magnetic suspension systems

Proceedings of the NASA Conference on Space Telerobotics, volume 5

Papers presented at the NASA Conference on Space Telerobotics are compiled. The theme of the conference was man-machine collaboration in space. The conference provided a forum for researchers and engineers to exchange ideas on the research and development required for the application of telerobotics technology to the space systems planned for the 1990's and beyond. Volume 5 contains papers related to the following subject areas: robot arm modeling and control, special topics in telerobotics, telerobotic space operations, manipulator control, flight experiment concepts, manipulator coordination, issues in artificial intelligence systems, and research activities at the Johnson Space Center

Technology for large space systems: A bibliography with indexes (supplement 14)

This bibliography lists 645 reports, articles and other documents introduced into the NASA scientific and technical information system between July 1, 1985 and December 31, 1985. Its purpose is to provide helpful information to the researcher, manager, and designer in technology development and mission design according to system, interactive analysis and design, structural and thermal analysis and design, structural concepts and control systems, electronics, advanced materials, assembly concepts, propulsion, and solar power satellite systems