| 1. |
- Balluchi, A., et al.
(författare)
-
Hybrid control of networked embedded systems
- 2005
-
Ingår i: European Journal of Control. - : LAVOISIER. - 0947-3580 .- 1435-5671. ; 11:4-5, s. 478-508
-
Tidskriftsartikel (refereegranskat)abstract
- Hybrid systems that involve the interaction of continuous and discrete dynamics have been an active area of research for a number of years. In this paper, we start by briefly surveying the main theoretical control problems that have been treated in the hybrid systems setting and classify them into stabilization, optimal control and language specification problems. We then provide an overview of recent developments in four of the most prominent areas where these hybrid control methods have found application: control of power systems, industrial process control, design of automotive electronics and communication networks.
|
|
| 2. |
- Falkeborn, Rikard, et al.
(författare)
-
A Decomposition Algorithm for KYP-SDPs
- 2012
-
Ingår i: European Journal of Control. - : Hermes Science Publications. - 0947-3580 .- 1435-5671. ; 18:3, s. 249-256
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper, a structure exploiting algorithm for semidefinite programs derived from the Kalman–Yakubovich– Popov lemma, where some of the constraints appear as complicating constraints is presented. A decomposition algorithm is proposed, where the structure of the problem can be utilized. In a numerical example, where a controller that minimizes the sum of the H2-norm and the H∞-norm is designed, the algorithm is shown to be faster than SeDuMi and the special purpose solver KYPD.
|
|
| 3. |
- Gustafsson, Thomas
(författare)
-
On the design and implementation of a rotary crane controller
- 1996
-
Ingår i: European Journal of Control. - 0947-3580 .- 1435-5671. ; 2:3, s. 166-175
-
Tidskriftsartikel (refereegranskat)abstract
- This paper deals with the feedback control of a rotary crane. The goal is to design a control system that assists the operator to move the cargo without oscillations and correctly align the cargo at the final position. This is accomplished with a weakly coupled pair of state feedback controllers with a nonlinear compensator. The controller has been implemented and tested on a real crane.
|
|
| 4. |
- Hjalmarsson, Håkan, et al.
(författare)
-
Model-free Tuning of a Robust Regulator for a Flexible Transmission System
- 1995
-
Ingår i: European Journal of Control. - 0947-3580 .- 1435-5671. ; 1:2, s. 148-156
-
Tidskriftsartikel (refereegranskat)abstract
- Recently, a data-driven model-free iterative control design method has been proposed [Hjalmarsson et al., Proc. 33rd IEEE CDC, Orlando, FL, 1994, 1735–1740]. This design method works directly with closed loop data from the plant and iteratively improves the pelformance. This contribution reports a simulation study of this method when applied to a flexible transmission system. The system is characterised by load dependent dynamics and certain performance specifications have to be satisfied for three different load cases. These specifications cannot be translated into a specific control criterion a priori. However, by adaptively changing the design criterion it is shown that it is possible to tune the criterion so as to eventually obtain the desired closed loop performance for all three load cases with the same controller. The new concepts of synthetic noise and time delays are shown to be valuable tools when tuning the criterion.
|
|
| 5. |
|
|
| 6. |
|
|
| 7. |
|
|
| 8. |
- Panteley, Elena, et al.
(författare)
-
Global Uniform Asymptotic Stability of Cascaded Nonlinear Non-Autonomous Systems
- 1999
-
Ingår i: European Journal of Control. - 0947-3580 .- 1435-5671. ; 5:1, s. 107-115
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper, we deal with the stability analysis problem of cascaded non-autonomous non-linear systems. In particular, we answer to the following questions: (i) What happens with the solutions of a time-varying non-linear system which is globally uniformly stable (GUS), when it is perturbed by the output of a globally exponentially stable (GES) system, in particular, when both systems form a cascade? (ii) If a time-varying non-linear system is globally uniformly asymptotically stable (GUAS), is this stability properly preserved when it is perturbed by an exponentially decaying input? Our proofs are based on a standard ‘delta-epsilon’ Lyapunov analysis. Finally, we show the utility of our results by applying our theorems to the problem of stabilisation of a turbo-charged diesel engine.
|
|
| 9. |
|
|
| 10. |
- Alanwar, Amr, et al.
(författare)
-
Privacy-preserving set-based estimation using partially homomorphic encryption
- 2023
-
Ingår i: European Journal of Control. - : Elsevier BV. - 0947-3580 .- 1435-5671. ; 71, s. 100786-
-
Tidskriftsartikel (refereegranskat)abstract
- The set-based estimation has gained a lot of attention due to its ability to guarantee state enclosures for safety-critical systems. However, collecting measurements from distributed sensors often requires out-sourcing the set-based operations to an aggregator node, raising many privacy concerns. To address this problem, we present set-based estimation protocols using partially homomorphic encryption that pre-serve the privacy of the measurements and sets bounding the estimates. We consider a linear discrete-time dynamical system with bounded modeling and measurement uncertainties. Sets are represented by zonotopes and constrained zonotopes as they can compactly represent high-dimensional sets and are closed under linear maps and Minkowski addition. By selectively encrypting parameters of the set repre-sentations, we establish the notion of encrypted sets and intersect sets in the encrypted domain, which enables guaranteed state estimation while ensuring privacy. In particular, we show that our protocols achieve computational privacy using the cryptographic notion of computational indistinguishability. We demonstrate the efficiency of our approach by localizing a real mobile quadcopter using ultra-wideband wireless devices.
|
|
