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ASME 1999 Design engineering Technical Conferences, DETC 1999

作者： Zhou, Kongyi Lenz, Timothy Radcliffe, Clark Sticklen, Jon Intelligent Systems Laboratory Department of Computer Science Michigan State University United States Composite Materials and Structures Center Intelligent Systems Laboratory Department of Chemical Engineering Michigan State University United States Department of Mechanical Engineering Michigan State University United States

ISBN: (纸本)9780791819715

Conceptual design is an early but important stage of the design process that greatly affects the quality and cost of the final design. Intelligent tools that embody design rationale about function, structure, material, and manufacturing technology can help designers quickly generate and evaluate configuration ideas. This can help shorten the design cycle and reduce the risk of design failure in later stages. This paper presents a virtual prototyping system for redesigning metal structures out of polymer composites. The system provides a modeling tool to represent the original design based on a domain-specific ontology and a design transformation tool that generates, refines, and evaluates redesign concepts for composites. The discussion in this paper focuses on the system architecture that performs the design transformation problem solving. Important issues in the transformation strategies and control mechanisms are also addressed. An example of the redesign of a portion of an unmanned aerial vehicle is used to illustrate the redesign process throughout. Copyright © 1999 by ASME.

关键词： Conceptual design

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On adaptive smoothing of empirical transfer function estimates

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IFAC Proceedings Volumes 1999年第2期32卷 4183-4188页

作者： Anders Stenman Fredrik Gustafsson Daniel E. Rivera Lennart Ljung Tomas McKelvey Department of Electrical Engineering Linköping University SE-581 83 Linköping Fax: +46 13 28 26 22 Sweden Department of Chemical Bio and Materials Engineering and Control Systems Engineering Laboratory Arizona State University Tempe Arizona USA

The determination of the right resolution parameter when estimating frequency functions for linear systems is a trade-off between bias and variance. Traditional approaches, like “window-closing” employ a global resolution parameter - the window width - that is tuned by ad hoc methods, usually visual inspection of the results. Here we suggest an adaptive method that tunes such parameters by an automatic procedure. A further benefit is that the tuning can be done locally, i.e., different resolutions can be used in different frequency bands. The ideas are based on local polynomial regression and the “just-in-time”-model concept. The advantages of the method are illustrated in numerical examples.

关键词： frequency-response methods non-parametric regression

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Multi-level pseudo-random signal design and "model-on-demand" estimation applied to nonlinear identification of a RTP wafer reactor

Multi-level pseudo-random signal design and "model-on-demand...

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American control Conference (ACC)

作者： M.W. Braun D.E. Rivera A. Stenman W. Foslien C. Hrenya Department of Chemical Bio and Materials Engineering Control Systems Engineering Laboratory Arizona State University Tempe AZ USA Division of Automatic Control Department of Electrical Engineering Linköping University Linkoping Sweden Honeywell Technology Center Minneapolis MN USA

Guidelines are presented for specifying the design parameters of multi-level pseudo-random sequences in a manner useful for "plant-friendly" nonlinear system identification. These multi-level signals are introduced into a rapid thermal processing wafer reactor simulation and compared against a well-designed pseudo-random binary sequence (PRBS). The resulting data serves as a database for a "model on demand" (MoD) predictor. MoD estimation is attractive because it requires less engineering effort to model a nonlinear plant, compared to global nonlinear models such as neural networks. The improved fit of multi-level signals over the PRBS signal, as well as the usefulness of the MoD estimator, is demonstrated on validation data.

关键词： Signal design Semiconductor device modeling Guidelines Nonlinear systems Signal processing Rapid thermal processing Inductors Binary sequences Databases Neural networks

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Comparison of global nonlinear models and "model-on-demand" estimation applied to identification of a RTP wafer reactor

Comparison of global nonlinear models and "model-on-demand" ...

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IEEE Conference on Decision and control

作者： M.W. Braun D.E. Rivera A. Stenman W. Foslien Department of Chemical Bio and Materials Engineering Systems Engineering Laboratory Manufacturing Institute Arizona State University Tempe AZ USA Division of Automatic Control Department of Electrical Engineering Linkoping University Linkoping Sweden Honeywell Technology Center Minneapolis MN USA

"Model on demand" (MoD) simulation of the temperature dynamics in a simulated rapid thermal processing (RTP) reactor is compared against various types of global models (ARX, semiphysical, combined semiphysical with neural net). The identification data is generated from an m-level pseudo-random sequence input whose parameters are specified systematically using a priori information readily available to the engineer. The MoD estimator outperforms the ARX model and a two semi-physical models, while matching the performance of a combined semi-physical with neural net model. This makes MoD estimation an appealing alternative to global methods because of its reduced engineering effort and simplified a priori knowledge regarding model structure.

关键词： Semiconductor process modeling Inductors Neural networks Predictive models Semiconductor device modeling chemical technology State estimation systems engineering and theory Automatic control Rapid thermal processing

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Response of simultaneously recorded cortical neurons to perturbations in arm trajectory

Response of simultaneously recorded cortical neurons to pert...

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Annual International Conference of the IEEE engineering in Medicine and biology Society (EMBC)

作者： D.J. Weber J. He R.E. Isaacs A.B. Schwartz Chemical Bio and Materials Engineering Department Arizona State University Tempe AZ USA Motor Control Laboratory Neurosciences Institute La Jolla CA USA

Cortical neural prostheses may someday be used to augment or restore lost motor functions by deriving movement commands from neural activity recorded in the brain. Many studies have identified relationships between the discharge patterns of cortical neurons and arm movement parameters (e.g. direction and force). We are currently investigating these relationships in simultaneously recorded cortical neurons to generate a movement command in real-time. A perturbation paradigm has been implemented to study changes in cortical activity as the monkey responds and adapts to a perturbation in trajectory. Over 40 neurons were recorded simultaneously over a 2-week period. Distinct and stable cortical responses (to movement and perturbation) were observed across the two weeks of trials.

关键词： Neurons Prosthetics Disk recording Analysis of variance Helium chemical engineering biological materials Motor drives Laboratories Microelectrodes

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Robust H ∞ observers for uncertain time-delay systems: (II) the discrete-time case

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IFAC Proceedings Volumes 1999年第2期32卷 3432-3437页

作者： Zidong Wang Biao Huang H. Unbehauen Systems and Control Group Department of Mathematics University of Kaiserslautern P.O. Box 3049 D-67653 Kaiserslautern Fax: ++49/631 205 3052 Germany Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta T6G 2G6 Canada Automatic Control Laboratory Faculty of Electrical Engineering Ruhr-University Bochum D-44780 Bochum Germany

In this note we consider the problem of H ∞ observer design for a class of uncertain linear discrete-time systems with delayed state and parameter uncertainties. The goal of this problem is to design a linear state observer such that, for the positive integer state time-delay and all admissible norm-bounded parameter uncertainties, the observation process remains robustly stable and the transfer function from exogenous disturbances to error state outputs meets the prespecified H ∞ norm upper bound constraint. The observer structure does not depend on the parameter uncertainties. A simple, effective algebraic methodology is developed to derive the conditions for the existence of the desired robust H ∞ observers, and the analytical expression of these observers is then characterized in terms of the matrix Riccati-like equations/inequalities. We provide a numerical example to demonstrate the validity and the applicability of the proposed approach.

关键词： Linear systems Uncertainty Time-delay Observers H-infinity control Robust stability

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Robust H ∞ observers for uncertain time-delay systems: (I) the continuous-time case

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IFAC Proceedings Volumes 1999年第2期32卷 3426-3431页

作者： Zidong Wang Biao Huang H. Unbehauen Systems and Control Group Department of Mathematics University of Kaiserslautem P.O. Box 3049 D-67653 Kaiserslautern Fax: ++49/631 205 3052 Germany Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta T6G 2G6 Canada Automatic Control Laboratory Faculty of Electrical Engineering Ruhr-University Bochum D-44780 Bochum Germany

This note deals with the problem of H ∞ observer design for a class of uncertain linear systems with delayed state and parameter uncertainties. This problem aims at designing the linear state observers such that, for all admissible parameter uncertainties, the observation process remains robustly stable and the transfer function from exogenous disturbances to error state outputs meets the prespecified H ∞ on norm upper bound constraint, independently of the time-delay. The time-delay is assumed to be small but unknown, and the parameter uncertainties are allowed to be norm-bounded and appear in all the matrices of the state-space model. An effective matrix inequality methodology is developed to solve the proposed problem. We derive the conditions for the existence of the desired robust H ∞ observers, and then characterize the analytical expression of these observers. A numerical example demonstrates the validity and applicability of the present approach.

关键词： Linear systems Uncertainty Time-delay Observers H-infinity control Robust stability

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Blackwater and Graywater on US navy ships: Technical challenges and solutions

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NAVAL ENGINEERS JOURNAL 1999年第3期111卷 293-306页

作者： Benson, J Caplan, I Jacobs, R John Benson:received his BS degree in Mechanical Engineering and MS degree in Environmental Engineering from the University of Maryland. He is a registered Professional Engineer in the State of Maryland. He Joined the Naval Sufrace Warfare Center Carderock Division Environmental Quality Department in 1990 as a project engineer and is now managing the non-oily wastewater (graywater and blackwater) project area. Mr. Ivan Caplan:graduated from Drexel University (Philadelphia Pennsylvania) with a BS in Metallurgical Engineering and was awarded a MS degree from the Johns Hopkins University (Baltimore Maryland) in Mechanics and Materials Science. Mr. Caplan has spent most of his career at the Carderock Division Naval Surface Warfare Center (NSWC) and is currently the Head of the Wastewater Management Branch in the Carderock Division's Environmental Quality Department. Previously Mr. Caplan managed the US Navy's Applied Research Program in Ship & Submarine Materials Technology. In addition Mr. Caplan was manager of the US Navy's Titanium Technology Program Office and during his government career held several external Program Manager positions on at the Naval Sea Systems Command and another at the Air Force Office of Scientific Research. Rachel Jacobs:received BS degrees in Chemical Engineering and Marine Biology from the University of Maryland College Park. After working for the Naval Research Laboratory in Washington DC and the Center for Marine Biotechnology in Baltimore MD she joined the staff of the Naval Surface Warfare Center's Environmental Quality Department in 1997. Since thta time Ms. Jacobs has worked in the non-oily wastewater treatment area and her principal responsibility has been to technically supervise the evaluation operation and modification graywater treatment.

In anticipation of more stringent environmental regulations, the increasing costs of waste disposal, and the need for naval combatants to operate unimpeded in littoral waters, the U.S. Navy has identified the need to develop technologies which are appropriate for the control and treatment of blackwater and graywater. This paper will describe the status of development efforts by the Carderock Division, Naval Surface Warfare Center (CDNSWC) and its supporting contractors, under sponsorship of Naval Sea systems Command (NAVSEA) and the Office of Naval Research. The challenge was to develop treatment systems that meet Navy shipboard requirements for affordability, compactness, low manning/maintenance, high reliability and safety, and EM, noise, vibration and shock. Membrane ultrafiltration based systems, incorporating aerobic biological pre-treatment and ultraviolet light post treatment disinfection, have ken developed to meet these requirements. Both external and in-tank membrane systems will be described in terms of performance, system operation and space and weight advantages.

关键词： Naval vessels

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Royal Academy of Medicine in Ireland - Section of bioengineering - Proceedings of meeting held in Dundalk, Co. Louth, in February 1998.

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IRISH JOURNAL OF MEDICAL SCIENCE 1998年第4期167卷 256-276页

作者： [Anonymous] Orthopaedic Research Unit The Queen’s University of Belfast School of Biomedical Sciences The Queen’s University of Belfast Howmedica International Ltd. Raheen Industrial Estate Limerick Department of Mechanical Engineering Trinity College Dublin 2 Mater Hospital Dublin 7 Orthopaedic Research Laboratory Århus University Hospital Denmark University of Limerick Limerick Limerick Regional Hospital Raheen Limerick Boston Scientific Ireland Ltd. Galway Department of Mechanical Engineering University College Dublin Dublin Department of Electrical and Electronic Engineering University College Dublin Dublin Bioengineering Research Centre Department of Mechanical Engineering University College Dublin Dublin Northern Ireland Bio-Engineering Centre (NIBEC) School of Electrical and Mechanical Engineering University of Ulster Newtownabbey Department of Mechanical & Manufacturing Engineering The Ashby Building The Queen’s University of Belfast Johnson and Johnson Professional Orthopaedic Division Queensway England Department of Cardiology and Department of Medical Physics & Bioengineering St. James’s Hospital Dublin 8 Burke House Ellison Street Castlebar Royal College of Surgeons in Ireland Department of Surgery Beaumont Hospital Dublin Department of Electronic and Electrical Engineering Trinity College Dublin 2 Department of Aeronautical Engineering The Queen’s University of Belfast Vascular Unit Belfast City Hospital Department of Medical Physics and Bioengineering St. James’s Hospital Dublin 8 Centre for Biomedical Electronics Department of Electronic and Computer Engineering University of Limerick Limerick Department of Mechanical and Aeronautical Engineering University of Limerick Limerick School of Health Sciences University of Ulster Ireland School of Physiotherapy University of Ulster Newtownabbey Clinical Engineering NI Medical Physics Agency Belfast and Radiology Royal Victoria Hospital Musgrave Park Hospital University of Limerick Biomedical Institute (ULBMI) Uni

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ASUtune : A Program for Integrated System Identification and PID controller Design

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IFAC Proceedings Volumes 1997年第11期30卷 1505-1510页

作者： S. Adusumilli D.E. Rivera Department of Chemical Bio and Materials Engineering and Control Systems Engineering Laboratory Manufacturing Institute Arizona State University Tempe Arizona 85287-6006 phone (602)-965-9476

This paper describes ASUtune , a MATLAB program for combined identification and PID controller design. By integrating identification with PID controller design, the method displays functionality that is often demanded by the practicing engineering community. The major steps in this integrated methodology are, experimental design and execution, high-order ARX estimation, and control-relevant model reduction leading to models that comply with the IMC-PID tuning rules. These PID tuning rules are compatible with the Honeywell TDC 3000 distributed control system.

关键词： system identification PID control model reduction control-oriented modeling

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