Concept
Diagramme de Bode
Publications associées (45)
Auto-ajustement de régulateurs PID robustes dans le domaine fréquentiel
This work considers the adjustment of proportional-integral-derivative (PID) controllers. Because of their very simple structures, this kind of controllers are very appreciated, and used abundantly by the industrial community. The restricted number of the ...
EPFL2006PID controller design with constraints on sensitivity functions using loop slope adjustment
Alireza Karimi, Roland Longchamp, Daniel Garcia
This paper presents a PID controller design method for stable minimum- phase systems. The approach is similar to the one proposed in the so-called modified Ziegler- Nichols method, where only one point on the frequency response of the plant is measured and ...
2006Robust PID Controller Design by Linear Programming
Alireza Karimi, Roland Longchamp, Marc Kunze
A linear programming approach is proposed to tune fixed-order linearly parameterized controllers for stable LTI plants. The method is based on the shaping of the open-loop transfer function in the Nyquist diagram. A lower bound on the crossover frequency a ...
2006Multi-Objective Optimisation of Herringbone Grooved Gas Bearing Supporting a High Speed Rotor, Taking into account Rarefied Gas and Real Gas Effects
Daniel Favrat, Jürg Alexander Schiffmann
Currently the herringbone grooved journal bearing (HGJB) has applications in the domain of small, low power energy related applications, where high rotational speeds are required for reaching reasonable efficiency and where standard oil lubricated bearings ...
2006Analysis of Cascade Structure with Predictive Control and Feedback Linearization
Dominique Bonvin, Philippe Müllhaupt, Kahina Guemghar
Abstract Predictive control and feedback linearization are two popular approaches for the control of nonlinear systems. In this paper, a cascade combination of the two metho ds is proposed, where control based on input- output feedback linearization forms ...
2005Vertical micro-distribution and response to nitrogen deposition of testate amoebae in Sphagnum
Previous studies have shown the existence of a vertical micro-distribution of testate amoebae in the first centimeters of Sphagnum and their response to nutrient enrichment. In order to test the response of testate amoebae to depth and N addition in dry mo ...
2004PID Controller Tuning Using Bode's Integrals
Alireza Karimi, Roland Longchamp, Daniel Garcia
A new method for PID controller tuning based on Bode's integrals is proposed. It is shown that the derivatives of amplitude and phase of a plant model with respect to frequency can be approximated by Bode's integrals without any model of the plant. This in ...
2003Effects of elevated CO2 and N deposition on CH4 emissions from European mires
[1] Methane fluxes were measured at five sites representing oligotrophic peatlands along a European transect. Five study plots were subjected to elevated CO2 concentration (560 ppm), and five plots to NH4NO3 (3 or 5 g N yr(-1)). The CH4 emissions from the ...
2003On-line biomass monitoring of CHO perfusion culture with scanning dielectric spectroscopy
Urs von Stockar, Ian William Marison, Christopher Cannizzaro
In this work, dielec. spectroscopy was used to monitor two CHO perfusion culture expts. (B14 and B16). The capacitance of the cell suspension was recorded every 20 min over an excitation frequency range of 0.2 MHz to 10.0 MHz. A phase plot of the capacitan ...
2003Extension of the TCV operating space towards higher elongation and higher normalized current
Olivier Sauter, Stefano Coda, Yves Martin, Jean-Marc Moret, Xavier Llobet, Pierre Lavanchy, Antoine Pochelon, Philippe Marmillod, Andrei Martynov
Recently, an experimental campaign has been launched on TCV with the aim of exploring and extending the limits of the operating space. The vertical position control system has been optimized, with the help of extensive model calculations, in order to allow ...
2002