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2006 IIE Annual Conference and Exposition

作者： Venkateswaran, Jayendran Son, Young-Jun Industrial Engineering and Operations Research Indian Institute of Technology Bombay Mumbai 400076 India Department of Systems and Industrial Engineering University of Arizona Tucson AZ 85721 United States

With modern supply chains hurtling towards 'information overloading,' it is of great interest to know what data is required for effective decision making and how often the data needs to be updated. The latter part on how often is the focus of this paper. The inventory and production ordering policies among the players (Manufacturer and Distributors) of a two echelon supply chain are studied. System dynamics models of the different players are developed. Z-transform techniques are employed to derive the general stability condition. Stability of the supply chain under different strategies (communicative vs. vendor managed inventory) is appraised and their implications on the information synchronization needs are analyzed.

关键词： Supply chain management

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Backstepping technique based nonlinear controller for a textile dyeing process

Backstepping technique based nonlinear controller for a text...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： B. Bandyopadhyay J. V. Desai C. D. Kane Systems & Control Engineering Indian Institute of Technology Bombay Mumbai India Textile and Engineering Institute Ichalkaranji India

This paper describes a control scheme for a MIMO system using backstepping method. Backstepping method is preferred in case of uncertainties in the process and constraints acting on the control input. In the present work, backstepping method for a PMTD process is investigated in order to maintain the concentration and volume of the dye bath thereby reduce the tailing effect. The proposed control strategy is designed and simulated using Matlab/simulink and results are presented to validate the proposed control scheme

关键词： Backstepping Fabrics Mathematical model Nonlinear control systems control systems Feeds Nonlinear equations control engineering Textile technology MIMO

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Modified Sector Scheme to Overcome Flux Drooping of Direct Torque controlled IPMSM

Modified Sector Scheme to Overcome Flux Drooping of Direct T...

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Annual Conference of Industrial Electronics Society

作者： Priya Verma B.G. Fernandes Department of Energy Systems Engineering Indian Institute of Technology Bombay India Department of Electrical Engineering Indian Institute of Technology Bombay India

Flux drooping occurs at the sector transition in direct torque controlled drives especially at low speed and high load operating conditions. A comprehensive analysis of this phenomenon and the schemes reported in the literature to address this limitation are presented in the paper. In addition, an efficient control scheme is proposed to minimize the flux drooping at sector boundaries. The proposed scheme is independent of the machine parameters and is easy to implement. Results of the hardware-in-the-loop (HIL) simulation studies carried out on DSP TMS320F240 prove the validity of the proposed scheme

关键词： Torque control Stators Sensorless control Sampling methods Voltage control Functional analysis Hysteresis motors control systems Power engineering and energy systems engineering and theory

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Novel maximum power point tracker for stand-alone self-excited induction generator

Novel maximum power point tracker for stand-alone self-excit...

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India International Conference on Power Electronics (IICPE)

作者： G.V. Jayaramaiah B.G. Fernandes Energy Systems Engineering Indian Institute of Technology Bombay Mumbai Maharashtra India Department of Electrical Engineering Indian Institute of Technology Bombay Mumbai Maharashtra India

In this paper, a simple control strategy for maximum power extraction from stand-alone wind energy conversion system using induction generator under variable speed and load conditions is proposed. This is achieved by varying the inverter frequency and modulation index depending upon the changes in load at the IG terminal. The proposed method eliminates the need of a speed encoder, and hence itpsilas an attractive sensor-less control method. The developed model is simulated in MATLAB/SIMULINK. The simulation results are presented to validate the developed control strategy. The control algorithm is implemented on TMS320F243 DSP. Experimental results closely resemble the simulated results.

关键词： Induction generators Pulse width modulation inverters control systems Frequency Capacitors Digital signal processing Reactive power Wind turbines Voltage control Power electronics

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Novel Voltage controller for Stand-alone Induction Generator using PWM-VSI

Novel Voltage Controller for Stand-alone Induction Generator...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： G. V. Jayaramaiah B. G. Fernandes Research Scholar Energy Systems Engineering Indian Institute of Technology Bombay Mumbai India Department of Electrical Engineering Indian Institute of Technology Bombay Mumbai India

This paper presents a DSP-based constant voltage controller for stand alone wind energy conversion system using an induction generator. The system uses a pulse-width modulated voltage source inverter (PWM-VSI) with a start-up battery. The limitation of having stand alone wind energy conversion system with self-excited induction generator (SEIG) is poor voltage regulation which occurs with change in speed and load condition. To overcome this problem, a DSP-based voltage controller is developed. It regulates the voltage when SEIG is subjected to a sudden application/removal of load. It is now possible to operate the induction generator (IG) at constant voltage from no load to full load. The amplitude of the terminal voltage of the IG is regulated by varying the modulation index of the PWM inverter. The system has an inherent current limiting feature and it requires only sensing of dc link voltage. To predict the performance of the proposed system, a MATLAB/SIMULINK-based simulation study is carried out. The control algorithm is implemented on a TMS320F243 DSP platform at the assembly language level for optimum performance of the voltage controller. Viability of the compensation process is ascertained through experimental results obtained from the laboratory prototype

关键词： Pulse width modulation Voltage control Induction generators Pulse width modulation inverters Wind energy control systems Pulse inverters Batteries Current limiters MATLAB

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A techno-economic feasibility study on removal of persistent colour and COD from anaerobically digested distillery effluent: A case study from India

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Clean Technologies and Environmental Policy 2006年第4期8卷 273-285页

作者： Dikshit, A.K. Chakraborty, Dhiman Centre for Environmental Science and Engineering Indian Institute of Technology Bombay Powai Mumbai 400076 India West Bengal Pollution Control Board Hooghly Regional Office Hooghly 711224 West Bengal Delhi Road Dankuni India

The present study aims at evaluating the potential options for further reduction of persistent dark brown colour and COD from anaerobically digested distillery effluent from a distillery in West Bengal, India. Two alternatives viz. physico-chemical method and attached growth biological method were evaluated for their potential and cost effectiveness in removing the COD and colour from the effluent. Under the physico-chemical option, detailed coagulation study was carried out with a number of coagulants such as alum, potash alum, ferric chloride, ferrous sulphate and lime. Then, additional removal of COD as well as colour was tried by applying an oxidant such as hydrogen peroxide or bleaching powder. Finally, adsorption study was performed with adsorbents viz. powdered activated alumina, wood charcoal and activated bone char. Under the biological treatment option, the efficacy of two fungi namely Aspergillus fumigatus and Coriolus versicolor was studied in batch mode under sterile condition for different dilutions. Finally, the performance of A. fumigatus was evaluated in continuous mode under ambient condition with the aid of fabricated lab scale bio-filters for different flow rates. All experimental results clearly showed that the removal of colour and COD were inter-related. Physico-chemical treatment was efficient in overall 96% COD removal and 93% colour removal with a treatment cost of Rs. 3.21 per litre (1$=Rs. 46), if double coagulation-flocculation followed by peroxide treatment followed by adsorption onto acid-treated bone char was adopted. Only double-flocculation followed by adsorption was also an alternative yielding an overall 84% COD removal and 74% colour removal at a very nominal cost of Rs. 0.41 per litre. A maximum of 70% colour could be removed by 10% A. fumigatus inoculum in raw wastewater sample in batch mode under sterile conditions. However, under ambient winter conditions, the maximum colour removal of 48% and COD removal of 32% could be achi

关键词： Aspergillus fumigatus Attached growth biological treatment Distillery wastewater Effluent treatment Physico-chemical treatment

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Spatial control of A Large PHWR by Multirate Output Feedback based Sliding Mode control

Spatial Control of A Large PHWR by Multirate Output Feedback...

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IEEE International Conference on Industrial technology (ICIT)

作者： G. Datatreya Reddy B. Bandyopadhyay A. P. Tiwari IDP in Systems and Control Engineering Indian Institute of Technology Bombay Mumbai India Reactor Control Division Bhabha Atomic Research Centre Mumbai India

The paper presents a novel method to design a spatial control for a large PHWR based on multirate output feedback robust sliding mode control. The proposed method does not require state information of the system, for feedback purposes. The proposed control technique is easy to obtain and to implement. Simulation has been carried out using the nodal core model of PHWR to show the effectiveness of the proposed method.

关键词： Sliding mode control Output feedback control systems Neutrons Robust control Inductors Xenon Power distribution Automatic control Radioactive decay

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Multirate Output Feedback based Frequency Shaped Sliding Mode control

Multirate Output Feedback based Frequency Shaped Sliding Mod...

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IEEE International Conference on Industrial technology (ICIT)

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

This paper proposes a design of frequency shaped sliding mode controller using fast output sampling technique. A compensator is introduced in the sliding surface to attenuate the frequency component of the sliding mode dynamics so that the unmodelled dynamics are minimally excited. The fast output sampling technique is used to estimate the states of the system where the output is measured at a faster rate than the input updates. The control law performance is validated by the simulation.

关键词： Output feedback Sliding mode control Shape control Sampling methods Frequency dependence control systems Robust control State estimation Reduced order systems control system synthesis

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Design and Experimental Evaluation of Composite Output Feedback control for Smart Structures

Design and Experimental Evaluation of Composite Output Feedb...

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IEEE International Conference on Industrial technology (ICIT)

作者： D. Ezhilarasi M. Umapathy B Bandyopadhyay G. Uma Department of Instrumentation and Control Engineering National Institute of Technology Tiruchirapalli India Indian Institute of Technology Bombay Mumbai India

This paper proposes a composite output feedback controller which consists of periodic output feedback and fast output sampling feedback controller. Each of the controllers is designed to suppress the particular vibration mode. The proposed controller is applied to control the first two vibration modes of a piezoelectric actuated cantilever beam. The performance of the controller is shown by simulation and experimental results. A digital control system that consists of Simulink modeling software and dSPACE 1104 controller board is used for identification and control.

关键词： Output feedback Intelligent structures Sampling methods Vibration control control systems Intelligent sensors Adaptive control Structural beams Feedback control Sensor systems and applications

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Discrete Time Sliding Mode control for Piezoelectric Actuated Structures

Discrete Time Sliding Mode Control for Piezoelectric Actuate...

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IEEE International Conference on Industrial technology (ICIT)

作者： A. Girija M. Umapathy B. Bandyopadhyay G. Uma K. Dhanalakshmi Department of Instrumentation and Control Engineering National Institute of Technology Tiruchirapalli India Indian Institute of Technology Bombay Mumbai India

A reaching law based discrete sliding mode control is designed for piezoelectric actuated structures to suppress the vibration in the presence of disturbance. Recursive least square method is used to identify the model and the states are estimated using Kalman filter. The performance of the controller for vibration suppression and disturbance rejection is demonstrated through simulation and experimental results.

关键词： Sliding mode control control systems Sampling methods Vibration control Least squares methods Pi control State estimation State-space methods Algorithm design and analysis Structural beams

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