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45th AIAA Aerospace Sciences Meeting 2007

作者： Paranjape, Aditya Sinhat, Nandan Kumar Ananthkrishnan, Narayan Indian Institute of Technology Bombay Mumbai 400076 India Indian Institute of Technology Madras Chennai 600036 India Zeus Numerix Pvt Ltd. IIT Bombay Campus Mumbai 400076 India Department of Aerospace Engineering India AIAA United States Department of Mechanics and Control

ISBN: (纸本)1563478900

The bifurcation and continuation methodology has evolved over the last two decades into a powerful tool for the analysis of trim and stability problems in aircraft flight dynamics. Over the years, bifurcation methods have been employed to deal with a variety of problems in aircraft dynamics, such as predicting high angle of attack behavior, especially spin, and studying instabilities in rolling maneuvers. The bifurcation methodology has served as a tool for the design of flight control systems, and is promising to be a useful tool in the aircraft design, simulation, testing, and evaluation process. In the present paper, we describe the state-of-the-art in the use of bifurcation and continuation methods for the analysis of aircraft trim and stability with a few illustrative examples. Both the standard and extended bifurcation analysis procedures are discussed and typical results for instabilities in high-a flight and in inertia-coupled roll maneuvers are shown. This is followed by several problems in nonlinear flight dynamics where bifurcation and continuation methods have been fruitfully applied to yield effective solutions. Finally, the use of bifurcation theory to arrive at analytical instability criteria is demonstrated for the aircraft roll coupling and wing rock problems. 76 references have been cited in the text.

关键词： Aerospace engineering

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MICRO-simulation technique for residential location choice: A case study

MICRO-simulation technique for residential location choice: ...

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10th International Conference on Computers in Urban Planning and Urban Management, CUPUM 2007

作者： Kumar, M. Krishna Rao, K.V. Department of Civil Engineering University College of Engineering Osmania University Hyderabad-500 007 India Transportation Systems Engineering Department of Civil Engineering Indian Institute of Technology Bombay-400 076 India

ISBN: (纸本)9788585205775

The micro-simulation model demonstrated in this paper is like a building block, and additional models can be easily integrated into the model making complete land use transport micro-simulation model. This micro-simulation framework consists of two sub-models. The first model which is a socio-economic characterization module, assigns socio-economic characteristics to the basic/service employee using Monte Carlo technique based on the observed distributions of each of the characteristics. The second module allocates the residential sector to the basic/service employee. There after, the iterative process of Lowry land use model is followed to get the final distribution of population and employment in the study area. After performing several iterations of the process of Lowry land use model, the total population distribution and the service employment distribution were obtained for the study area. The observed and predicted population and service employment for base year were matching reasonably well. The predictive ability of all the four residential location choice models developed previously, viz., Revealed Preference (RP) model, Stated Preference Model (SP), joint RP-SP model by sequential method, joint RP-SP model by simultaneous method were compared in this simulation framework and found satisfactory.

关键词： Employment

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MPC RELEVANT IDENTIFICATION USING GENERALIZED ORTHONORMAL BASIS FILTERS *

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IFAC Proceedings Volumes 2007年第5期40卷 321-326页

作者： Koustubh Palnitkar Abhijit S. Badwe Sachin C. Patwardhan Ravindra D. Gudi Systems and Control Engineering Department of Chemical Engineering Indian Institute of Technology Powai Mumbai-400076 India

In MPC relevant identification, it is necessary to identify models that are suited for multi-step ahead predictions. This can be achieved by minimizing the multi-step ahead prediction error in the identification stage. This work aims at the development of a methodology for identification of MPC relevant models based on Generalized orthonormal basis filters (GOBF). Specifically, ARX models parameterized using GOBF are identified. The efficacy of the proposed modeling technique is demonstrated by carrying out simulation studies on the benchmark Shell control problem. The relative quality of the obtained models is evaluated through closed-loop performance with MPC.

关键词： Model Predictive control MPC relevant identification Generalized orthonormal basis filters ARX models

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Reduced Order Observer Design For Power System Stabilizer Using the Duality to Discrete Time Sliding Surface Design

Reduced Order Observer Design For Power System Stabilizer Us...

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Annual Conference of Industrial Electronics Society

作者： A. J. Mehta B. Bandyopadhyay A. Inoue Systems and Control Engineering Indian Institute of Technology Mumbai India

This paper presents design of discrete time reduced order observer using the duality with the discrete sliding surface design. First we established the duality between coefficients of the reduced order observer and sliding surface and then the reduced order observer is designed using the Riccati equation. Using the same concept, the reduced order observer is designed for the Power System Stabilizer(PSS) of single machine infinite bus (SMIB) system. The controller's main concern is to enhance the stability and to improve the dynamic response of the (SMIB) operating in different conditions. The simulation results shows the efficacy of the PSS with the reduced order observer.

关键词： Power systems Power system stability Sliding mode control Riccati equations Power system dynamics Design methodology control systems control engineering Power system simulation State feedback

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Automated aircraft sheet metal component production technologies

Automated aircraft sheet metal component production technolo...

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作者： Prasad, K.S.R.K. Selvaraj, P. Ayachit, P.V. Nagamani, B.V. Ramanathan, R.K. Indian Institute of Technology Bombay Mumbai 400 076 India Aeronautical Development Agency Bangalore 560 017 India Department of Aerospace Engineering India Manufacturing Systems Group Aeronautical Development Agency India

This article comprehensively presents an overview of the technological advances in automated aircraft sheet metal component production technology developments due to the initiative by the Aeronautical Development Agency, Ministry of Defense, Government of India, since 1989 in collaboration with the indian institute of technology, bombay. Commencing with a modest computer-aided flat pattern development software system suitable for a class of sheet metal components, this activity after several stages of development has now resulted in the development of full-fledged, personal-computer-based graphical interactive, three-dimensional application flat pattern development and automated production loft generation system. This research, encompassing the practical methods (exclusively developed for flat pattern software), literature survey, development of key algorithms suitable for designing a system for automated loft generation for a variety of surfaces with complex geometric features characteristic of aircraft sheet metal components with the aid of a wide choice of surface model creations, and testing and validation (carried out through an associated aircraft factory, Hindustan Aeronautics Limited), is now being published through four full-length papers concluding with the present paper. In fact, comprehensive illustrations of production lofts sampled from over thousands of parts used in the factory pertinent to the indian Light Combat Aircraft (termed as Tejas) and other projects like Advanced Light Helicopter (termed as Dhruv) sheet metal components are included here to provide insight into these developments, and also to provide a glimpse of the success of the mission of indigenous automated aircraft sheet metal component manufacture.

关键词： Aircraft

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Design of a Robust Sliding Mode controller using Multirate Output Feedback

Design of a Robust Sliding Mode Controller using Multirate O...

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IEEE Conference on control technology and Applications (CCTA)

作者： A. Inoue M. Deng K. Matsuda B. Bandyopadhyay Department of Systems Engineering Okayama University Okayama Japan Indian Institute of Technology Bombay Mumbai India

This paper considers a robust sliding mode control scheme using multirate output feedback. Using different plant output rates including the former plant output information, sampling error at multiple sampling interval is considered to discrete-time output feedback control design. As a result, control performance can be improved. Meanwhile, the multirate output feedback can also guarantee closed-loop system stability.

关键词： Robust control Sliding mode control Output feedback control systems Sampling methods Error correction control design Stability Force control Design engineering

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On High Spatial Reuse Link Scheduling in STDMA Wireless Ad Hoc Networks

On High Spatial Reuse Link Scheduling in STDMA Wireless Ad H...

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IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Ashutosh Deepak Gore Abhay Karandikar Srikanth Jagabathula Department of Electrical Engineering Indian Institute of Technology Bombay India Laboratory for Information and Decision Systems Massachusetts Institute of Technology MA USA

We consider the point-to-point link scheduling problem in Spatial Time Division Multiple Access (STDMA) wireless ad hoc networks, motivate the use of spatial reuse as performance metric and provide an explicit characterization of spatial reuse. We assume uniform transmission power at all nodes and propose an algorithm based on a graph model of the network as well as Signal to Interference and Noise Ratio (SINR) computations. Our algorithm achieves higher spatial reuse than existing algorithms, without compromising on computational complexity.

关键词： Mobile ad hoc networks Scheduling algorithm Signal to noise ratio Interference Throughput Measurement Computational complexity Time division multiple access Computer networks Broadcasting

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A Novel Method Of controller Design For Simultaneous Stabilization And Performance Improvement Of An Electromagnetic Levitation System

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Asian Journal of control 2008年第4期9卷

作者： Subrata Banerjee T. K. Sunil Kumar Jayanta Pal Dinkar Prasad Department of Electrical Engineering Indian Institute of Technology Kharagpur India. T.K.Sunil Kumar:was born in 1974 at Calicut India. He received the B.Tech in electrical engineering in 1997 from N.S.S College of Engineering Palakkad (Calicut University) and M.Tech in Power System in 2001 from Regional Institute of Technology Jamshedpur (Ranchi University). Since 2001 he has been pursuing research work for his Ph.D in Electrical Engineering at Indian Institute of Technology Kharagpur. He is a life member of Systems Society of India. His main research interests includes application of control theory and computers to power system model order reduction genetic algorithm PID tuning random search optimization controller deign in 2-DOF configuration and interval systems. Emerson Network Power India.

This paper describes design and implementation of a control philosophy for simultaneous stabilization and performance improvement of an electromagnetic levitation system. An electromagnetic levitation system is an inherently unstable and strongly nonlinear system. To determine the overall closed loop stability for such a system, cascade lead-lag compensation has mostly been reported [1,2]. However, a single lead controller can not satisfy both stability and performance for such unstable systems [3]. Performance enhancement to satisfy the conflicting requirements of fast response with almost zero overshoot and zero steady state error has been successfully achieved by using a two loop controller configuration. The lead controller in the inner loop is designed to ensure stability while the outer loop PI controller is designed for performance enhancement. This approach decouples the twin requirements of stabilization (by the inner loop) and performance achievement (by the outer PI loop). The outermost PI controller has been designed using the ‘Approximate Model Matching’ technique [4]. The proposed control strategy has been implemented and the experimentation has been demonstrated successfully. Different experimental results have been included for verification.

关键词： Electromagnetic levitation lead-lag compensation approximate model matching control switched-mode DC to DC chopper model order reduction technique.

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Relay-Free Sliding Mode control Technique based Power System Stabilizer for Single Machine Infinite Bus System

Relay-Free Sliding Mode Control Technique based Power System...

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American control Conference (ACC)

作者： Vitthal Bandal B. Bandyopadhyay Electrical Engineering Department Govt College of Engineering Pune India Systems and Control Engineering Indian Institute of Technology Mumbai India

The paper presents a new method for design of power system stabilizer (PSS) based on relay-free sliding mode control technique. The control objective is to enhance the stability and to improve the dynamic response of the single machine infinite bus (SMIB) system. We apply this relay-free sliding mode controller to design power system stabilizer for demonstrating the availability of the proposed approach.

关键词： Power system relaying Sliding mode control Power system control Power systems control systems Power system stability Power system dynamics Damping Adaptive control Robust control

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TRACKING control IN THE PRESENCE OF NONLINEAR DYNAMIC FRICTIONAL EFFECTS: ROBOT EXTENSION

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Asian Journal of control 2008年第3期1卷

作者： M. Feemster D.M. Dawson A. Behal W. Dixon Matthew Feemster received the B.S degree in Electrical Engineering from Clemson University Clemson South Carolina in December 1994. Upon graduation he remained at Clemson University and received the M.S. degree in Electrical Engineering in 1997. During this time he also served as a research/teaching assistant. His research work focused on the design and implementation of various nonlinear control algorithms with emphasis on the induction motor and mechanical systems with friction present. He is currently working toward his Ph.D. degree in Electrical Engineering at Clemson University. Darren M. Dawson was born in 1962 in Macon Georgia. He received an Associate Degree in Mathematics from Macon Junior College in 1982 and a B.S. Degree in Electrical Engineering from the Georgia Institute of Technology in 1984. He then worked for Westinghouse as a control engineer from 1985 to 1987. In 1987 he returned to the Georgia Institute of Technology where he received the Ph.D. Degree in Electrical Engineering in March 1990. During this time he also served as a research/teaching assistant. In July 1990 he joined the Electrical and Computer Engineering Department and the Center for Advanced Manufacturing (CAM) at Clemson University where he currently holds the position of Professor. Under the CAM director's supervision he currently leads the Robotics and Manufacturing Automation Laboratory which is jointly operated by the Electrical and Mechanical Engineering departments. His main research interests are in the fields of nonlinear based robust adaptive and learning control with application to electro-mechanical systems including robot manipulators motor drives magnetic bearings flexible cables flexible beams and high-speed transport systems. Aman Behal was born in India in 1973. He received his Masters Degree in Electrical Engineering from Indian Institute of Technology Bombay in 1996. He is currently working towards a Ph.D in Controls and Robotics at Clemson University. His research focuses on the control of no

In this paper, we extend the observer/control strategies previously published in [25] to an n -link, serially connected, direct drive, rigid link, revolute robot operating in the presence of nonlinear friction effects modeled by the Lu-Gre model. In addition, we also present a new adaptive control technique for compensating for the nonlinear parameterizable Stribeck effects. Specifically, an adaptive observer/controller scheme is developed which contains a feedforward approximation of the Stribeck effects. This feedforward approximation is used in a composite controller/observer strategy which forces the average square integral of the position tracking error to an arbitrarily small value. Experimental results are included to illustrate the performance of the proposed controllers.

关键词： Friction compensation nonlinear control

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