| 1. |
- Ujvari, Sandor, 1972-, et al.
(författare)
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Using simulation for the design of Semi-Autonomous Vehicle systems
- 2001
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Ingår i: IFAC Proceedings Volumes. - : Elsevier. - 1474-6670. - 0080435548 ; 33:20, s. 351-356
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Tidskriftsartikel (refereegranskat)abstract
- The paper describes the development of Semi-Autonomous Vehicles (SAVS) in the context of Automated Guided Vehicle Systems (AGVS). During the design process of a complete material handling AGV-system many variables must be decided. A two-stage simulation approach of discrete event simulation and continuous path simulation, improves development and testing of SAVS, Decisions need to be made e. g. what main navigation sensor to use, how many vehicles are needed for the task. The interrelation of these parameters makes it difficult to find optimum or near-optimum values. Because of this, simulation is a very useful tool to design and evaluate AGV-systems. Copyright (C) 2000 IFAC.
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| 2. |
- Hang, Chang C., et al.
(författare)
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Practical Aspects of PID Auto-Tuners Based on Relay Feedback
- 1988
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Ingår i: 2nd International IFAC Symposium on Adaptive Control of Chemical Processes 1988 (ADCHEM '88), Lyngby, Copenhagen, Denmark, 17-19 August. - 1474-6670. ; 21:7, s. 153-158
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Konferensbidrag (refereegranskat)
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| 3. |
- Johansson, Rolf
(författare)
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Lyapunov Design for Adaptive Control of Robots
- 1989
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Ingår i: IFAC Proceedings Volumes (IFAC-PapersOnline). - 1474-6670. ; 22:3
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents algorithms for continuous-time direct adaptive control of robot manipulators. Lyapunov theory is used for controller design and stability investigation. Algorithms for rapid continuous-time adaptive control are presented.
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| 4. |
- Källström, Claes, et al.
(författare)
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Adaptive Autopilots for Large Tankers
- 1978
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Ingår i: 7th Triennial World Congress of the IFAC : A Link Between Science and Applications of Automatic Control, Helsinki, Finland, 12-16 June - A Link Between Science and Applications of Automatic Control, Helsinki, Finland, 12-16 June. - 1474-6670. ; 11:1, s. 477-484
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Konferensbidrag (refereegranskat)abstract
- The adaptive autopilots are based on velocity scheduling, a self-tuning regulator for steady state course keeping, a high gain turning regulator with variable structure, and a Kalman filter. Results from simulations and full-scale experiments on three different tankers are presented. The autopilots are shown to work excellently under different loads, speed and weather conditions.
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| 5. |
- Olsson, Gustaf, et al.
(författare)
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Estimation and Control of Biological Activity in the Activated Sludge Process Using Dissolved Oxygen Measurements
- 1977
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Ingår i: IFAC Symposium on Environmental Systems Planning, Design and Control, Kyoto, Japan, 1-5 August. - 1474-6670. ; 10:7, s. 745-755
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Konferensbidrag (refereegranskat)abstract
- The control of an activated sludge process is considered. It is discussed how the organism activity is a crucial information for the control. It is shown, how the concentration profile of dissolved oxygen (DO) in the biological reactor is related to the sludge activity. As a result the DO profile is a useful measurement information for control purposes
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| 6. |
- Åström, Karl Johan, et al.
(författare)
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Analysis of a Scheme for Iterated Identification and Control
- 1994
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Ingår i: IFAC Symposium on System Identification (SYSID'94), Copenhagen, Denmark, 4-6 July. - 1474-6670. ; 27:8, s. 473-478
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Konferensbidrag (refereegranskat)abstract
- This paper presents analysis of a scheme for iterated identification and control design. The approach is based on least squares identification in closed loop and pole placement design. It has previously been shown that the criteria for control and identification are the same provided that the data filters are chosen properly. The iterated scheme may be viewed as a recursion in model parameters. Each step consists of system identification and control design. Interesting questions are then: What are the fix points? Are the fix points stable? These questions are investigated for some simple examples. Relations to other problems like model reduction and adaptive control are also discussed.
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| 7. |
- Birk, Wolfgang, et al.
(författare)
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Foam level control in a water model of the LD converter process
- 2001
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Ingår i: Automation in mining, mineral, and metal processing 2001. - Oxford : Published for the International Federation of Automatic Control by Pergamon. - 1474-6670. - 0080436927
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Konferensbidrag (refereegranskat)abstract
- This paper deals with estimation and control of foam level in dynamic foaming. An improved foam level estimation methodology from a microphone signal and its automatic calibration is presented. The dynamical reaction of the foam level on air lance movements is modelled using system identification. Based on the resulting mathematical model, a controller for foam level stabilisation is designed and applied to a water model, representing the LD converter process. It is shown that the foam level can be controlled using a microphone as the measurement device and air lance movement as the actuator.
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| 8. |
- Ding, Limei, et al.
(författare)
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Application of fuzzy control to a flotation process
- 1999
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Ingår i: Elsevier IFAC Publications / IFAC Proceedings series. - Kildington : Elsevier. - 1474-6670. ; 32:2, s. 6998-7003, s. 391-396
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Tidskriftsartikel (refereegranskat)abstract
- The application of fuzzy logic in the control of flotation is studied in this paper. A general description of apatite flotation process is given and a dynamic model is developed. A fuzzy logic controller is proposed for a nonlinear isolated continuous flotation process. The knowledge base of the controller is constructed on the basis of the semi-batch results from the apatite flotation experiments and available knowledge sources. The design of the controller does not need an exact process model. The simulation result shows that the fuzzy logic controller can reduce collector dosage consumption of the apatite flotation process while maintaining the phosphorous content in magnetite concentrate within an acceptable limits less than 0.025% P. Stability of the fuzzy control system is discussed
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| 9. |
- Fischer, Britta, et al.
(författare)
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Control Relevant Identification in H∞ - Adaptive Information and Experiment Design
- 1996
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Ingår i: Elsevier IFAC Publications / IFAC Proceedings series. - 1474-6670. - 0080429084 ; 29:1, s. 4046-4051
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Tidskriftsartikel (refereegranskat)abstract
- Joint issues of modelling and control design are studied in a frequency domain setup. Stable systems with monotone Bode plots are chosen as the basis of the study presented in this work. Such dynamics is typical for plants in industrial process control. Adaptive information is considered and both open-loop and closed-loop experimental conditions are included. For systems with monotone Bode plots the information typically required for successful control design consists of a small part of the frequency response only. This can be exploited in experiment design.
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| 10. |
- Fischer, Britta, et al.
(författare)
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Laguerre domain estimation of time delays in narrowband ultrasonic echoes
- 1999
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Ingår i: Proceedings of the 14th World Congress. - Kildington : Publ. for the International Federation of Automatic Control by Pergamon. - 1474-6670. - 0080432190 ; , s. 361-366
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Konferensbidrag (refereegranskat)abstract
- The time delay of arrival (TDOA) is required in many areas in signal processing. In this paper we propose a novel and straightforward method to estimate small continuous time delays in narrowband signals out of a sampled sequence of the input and output signals. It is based on the parameterization of the identification problem in the Laguerre functions. An lp norm optimal estimator is then applied to estimate the delay. Furthermore, estimation bounds are studied and experiments from ultrasonic applications are presented to highlight the performance of the method
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