Showing papers in "IFAC Proceedings Volumes in 2012"

TL;DR: In this paper, an alternating augmented Lagrangian method for convex optimization problems where the cost function is the sum of two terms, one that is separable in the variable blocks, and a second th...

TL;DR: A review of recent advances in this research field, including theoretical results, algorithms and applications, can be found in this paper, where the authors also present a review of the application of switched and piecewise affine models.

TL;DR: A Cartesian impedance control, which provides a dynamic relationship between external generalized forces acting on the structure and the system motion, is designed and tested in a simulated case study.

TL;DR: The implementation of a recent probabilistic semi-numerical method for testing local structural identifiability based on computing the rank of a numerically instantiated Jacobian matrix (observability/identifiability matrix) is described and demonstrated to be capable of handling systems in the order of a hundred state variables and equally many parameters on a standard desktop computer.

TL;DR: In this paper, two methods to calculate the gains of a proportional-integral pitch angle controller for a 5 MW wind turbine were proposed. And the results from first and second analyses used to find the control gains at different wind speeds.

TL;DR: This paper proposes to reduce the conservatism of Lyapunov-Krasovskii functionals by introducing new classes of integral inequalities called Wirtinger inequalities, which encompass Jensen's inequality and is then employed to derive new stability conditions.

TL;DR: In this paper, a self-triggered MPC strategy based on quadratic costs is proposed, which applies to discrete-time linear systems subject to state and input constraints.

TL;DR: A survey on recent results on NMPC without terminal constraints can be found in this paper, where the authors investigate stability, performance and feasibility issues, both for classical stabilizing NMPC and for economic NMPC.

TL;DR: In this paper, the parallel operation of DC/AC inverters in a lossless microgrid with conventional droop controllers is described by the Kuramoto model of coupled phase oscillators.

TL;DR: Previous works on the stabilization of the Capture Point dynamics are extended by employing model predictive control (MPC), which allows to explicitly incorporate constraints on the zero-moment-point (ZMP) in the controller design.

TL;DR: In this article, a formal definition of the physical internet is introduced as an open global logistics system founded on physical, digital and operational interconnectivity through encapsulation, interfaces and protocols.

TL;DR: In this paper, a modified version of a well known line-of-sight (LOS) guidance algorithm for path-following is presented, which employs a time-varying equation for the lookahead distance which depends on the cross-track error.

TL;DR: In this article, a data-driven method for diagnosing the root cause of the plant-wide oscillation is presented, combining Granger causality, a statistical method based on linear prediction theory and principal component feature selection to provide a reliable diagnosis of oscillation propagation.

TL;DR: In this article, a distribution grid interconnecting a number of consumers with flexible power consumption is considered, where each consumer is under the jurisdiction of exactly one balancing responsible party (BRP), who buys energy at a day-ahead electricity market on behalf of the consumer.

TL;DR: Optimal PI-settings are derived for first-order with delay processes for specified levels of robustness and compared with the simple SIMC-rule, which was found to give surprisingly good setting with almost Pareto-optimal performance.

TL;DR: In this paper, an adaptive PID controller is proposed for fault-tolerant control of a quadrotor helicopter system in the presence of actuator faults, where a fuzzy inference scheme is used to tune in real-time the controller gains.

TL;DR: A novel algorithm for the detection of underwater man-made objects in forward-looking sonar imagery that takes advantage of the integral-image representation to quickly compute features, and progressively reduces the computational load by working on smaller portions of the image along the detection process phases.

TL;DR: In this paper, a robust PID control strategy via affine parametrization is designed for an multivariable nonlinear unmanned aerial vehicle, which is assured by using the H ∞ norm of the weighted complementary sensitivity function.

TL;DR: In this paper, the authors discuss PID modifications that improve the speed of recovery from process saturation conditions that are common in industrial applications, and present a prospective future direction for industrial PID controllers.

TL;DR: In this paper, the setpoint handling, feedforward from load disturbances, TITO (two input two output) control, noise filtering, and process dynamics compensation are discussed in an industrial case from the steel industry.

TL;DR: In this paper, a non-conservative robust nonlinear model predictive control scheme that can guarantee satisfaction of the constraints and optimal expected performance under uncertainty is introduced, which is evaluated by simulations using a well known benchmark problem where the operation of a semi-batch polymerization reactors is optimized under very tight temperature tolerance limits.

TL;DR: In this article, a new CIGRE working group was established to provide guidance with respect to load modeling of new types of load including renewables using measurement data and historical data, and beneficial recommendations of the load modelling such as selection of load model structure, picking up suitable data, proper approach for deriving load model parameters, requirement of measurement data, etc.

TL;DR: A dual fast gradient-projection approach to solving quadratic programming (QP) problems recently proposed in Patrinos and Bemporad that is particularly useful for embedded model predictive control (MPC) of linear systems subject to linear constraints on inputs and states is reviewed.

TL;DR: In this paper, the frequency response function of a linear system and the DFT of the input and output signals are modeled by local rational functions with a common denominator polynomial and a new method called Local Rational Method has been developed.

TL;DR: In this article, a control strategy for path following applications of underactuated surface vessels in the presence of constant irrotational ocean currents is revisited and improved based on a modified two-dimensional Line-of-Sight (LOS) guidance law with integral action and two feedback controllers.

TL;DR: In this article, an adaptive sampling interval is proposed for controlling LTI processes using MPC where the controller at every sampling instant not only computes the new control command but also decides the time interval to the next sample.

TL;DR: In this article, a hybrid system model of a building-wide HVAC system and its subsequent control using a learning-based model predictive control (LBMPC) is presented.

TL;DR: Version 8.0 of MATLAB's System Identification toolbox is released with version R2012a of MATLab in the spring of 2012, and this release presents a re-engineered implementation of the code using the new code-reduction-gauging system.

TL;DR: This paper examines distributed event-triggered estimation over wireless sensor networks and finds that in such systems an efficient utilization of the wireless communications must be performed since energy cons of such systems are high.

TL;DR: In this paper, the phase information of the output measurements from a linear system is omitted, and it is shown that the sparse signal can be recovered exactly by solving a semidefinite program when the sampling rate is sufficiently high.