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- Sololov, Bods M., et al.
(författare)
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The Control of the Top Blown Oxygen Converter Process
- 2001
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Ingår i: Elsevier IFAC Publications / IFAC Proceedings series. - 1474-6670. - 0080435602 ; 34:6, s. 1331-1335
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Tidskriftsartikel (refereegranskat)abstract
- This paper considers the control of the top blown oxygen converter process by exploiting the static equations of the process in order to compensate for measured disturbances. The dissipation region of the controller is evaluated. A nonlinear observer is introduced for estimating the metal analysis in real time. It is shown that the observer is asymptotically stable and a region of attraction, where the estimation error converges, is derived
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- Artemov, A. N., et al.
(författare)
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Large effect of thermal processes on the susceptibility of YBCO film with transport current
- 2004
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Ingår i: Physica. C, Superconductivity. - : Elsevier BV. - 0921-4534 .- 1873-2143. ; 403:3, s. 157-162
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Tidskriftsartikel (refereegranskat)abstract
- The response of YBCO film with transport current to the weak alternating magnetic field was studied. The hysteresis of the temperature dependences of the response measured under cooling and heating was revealed. The qualitative explanation of this phenomenon is proposed. It is based on the fact that under certain conditions the superconductor with transport current has two steady states. It is found that the hysteresis arises only if transport current exceeds some finite value I-0.
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- Bask, Michael, et al.
(författare)
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Analysis of least-squares state estimators for a harmonic oscillator
- 2000
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Ingår i: Proceedings of the 39th IEEE Conference on Decision and Control. - Piscataway, NJ : IEEE Communications Society. - 0780366387 ; , s. 3819-3824
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Konferensbidrag (refereegranskat)abstract
- The concept of least-squares observer is revisited. Robustness properties of this class of observers with respect to norm-bounded measurement noise are investigated and shown to be very much dependent on the operator chosen for the observer implementation. For the case of a harmonic oscillator, an explicit observer parameterization in terms of the implementation operator and the oscillator frequency is obtained, and observer's existence conditions are proven and analyzed
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- Birk, Wolfgang, et al.
(författare)
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A note on gramian-based interaction measures
- 2003
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Ingår i: Proceedings, European Control Conference.
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Konferensbidrag (refereegranskat)abstract
- This note deals with recently developed gramian based interaction measures. The measures are used for the choice of measurement/actuator pairs for decentralized control, where the controller remains unspecified. The theoretical background of these measures is clarified and a geometrical interpretation is given. Moreover, a generalization of the Hankel interaction index array to different gramian based system norms is proposed and it is shown that the introduction of weighted gramians makes the criteria more flexible and superior compared to the augmenting with additional filter dynamics. Finally, some examples are given to illustrate the usefulness of the generalized measures.
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- 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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- Birk, Wolfgang, et al.
(författare)
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Foam level control in a water model of the LD converter process
- 2003
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Ingår i: Control Engineering Practice. - 0967-0661 .- 1873-6939. ; 11:1, s. 49-56
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Tidskriftsartikel (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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