Publications related to Nyquist stability criterion

Integrated Design and Optimization of Gas Bearing Supported Rotors

Daniel Favrat, Jürg Alexander Schiffmann

The design of direct driven turbomachinery is an interdisciplinary task. Standard design procedures propose to split such systems into subcomponents and to design each one individually. This common procedure, however, tends to neglect the interactions betw ...

2010

A new tandem mass spectrometer for photofragment spectroscopy of cold, gas-phase molecular ions

Thomas Rizzo, Ulrich Lorenz, Annette Svendsen

We present here the design of a new tandem mass spectrometer that combines an electrospray ion source with a cryogenically cooled ion trap for spectroscopic studies of cold, gas-phase ions. The ability to generate large ions in the gas phase without fragme ...

American Institute of Physics2010

Data-driven controller validation

Dominique Bonvin, Alireza Karimi, Klaske van Heusden

This paper proposes a data-driven test for closed-loop stability. The test is based on a non-conservative stability condition that can be veriﬁed without having to actually implement the controller. It uses a set of measurements from the plant but does not ...

2009

H-infinity Controller Design for Spectral MIMO Models by Convex Optimization

Alireza Karimi, Roland Longchamp, Gorka Galdos Sanz de Galdeano

A recent method for robust fixed-order H-infinty controller design by convex optimization proposed in [1] is investigated in this paper for the tuning of multivariable controllers. Linear Time-Invariant Multi-Input Multi-Output (LTI-MIMO) systems represent ...

2009

Experimental vertical stability studies for ITER performance and design guidance

Jonathan Bryan Lister

Operating experimental devices have provided key inputs to the design process for ITER axisymmetric control. In particular, experiments have quantified controllability and robustness requirements in the presence of realistic noise and disturbance environme ...

2009

Indirect Manipulation of a Sphere on a Flat Disk Using Force Information

Masayuki Hara, Jian Huang

The objective of this study is to verify if only the use of robotic force feedback enables indirect and dynamic manipulations which are difficult for human beings to perform. Human beings usually control the trajectory of an object using visual feedback; f ...

2009

Frequency-domain controller design by linear programming

Marc Kunze

In this thesis, a new framework to design controllers in the frequency domain is proposed. The method is based on the shaping of the open-loop transfer function in the Nyquist diagram. A line representing a lower approximation for the crossover frequency a ...

EPFL2009

Frequency Domain Controller Design by Linear Programming Guaranteeing Quadratic Stability

Alireza Karimi, Roland Longchamp, Marc Kunze

In a recent work, a frequency method based on linear programming is proposed to design fixed-order linearly parameterized controllers for stable linear multi- model SISO systems. The method is based on the shaping of the open-loop transfer functions in the ...

IEEE2008

Data-driven controller tuning with integrated stability constraint

Dominique Bonvin, Alireza Karimi, Klaske van Heusden

This paper presents a data-driven controller-tuning algorithm that includes a sufficient condition for closed-loop stability. This stability condition is defined by a set of convex constraints on the Fourier transform of specific auto- and cross-correlatio ...

IEEE2008

Robust fixed-order H infinity Controller Design for Spectral Models by Convex Optimization

Alireza Karimi, Roland Longchamp, Gorka Galdos Sanz de Galdeano

A new approach for robust fixed-order

H_\infty

controller design by convex optimization is proposed. Linear time-invariant single-input single-output systems represented by a finite set of complex values in the frequency domain are considered. It is show ...

IEEE2008

Nyquist stability criterion

Graph Chatbot

Chat with Graph Search

Integrated Design and Optimization of Gas Bearing Supported Rotors

A new tandem mass spectrometer for photofragment spectroscopy of cold, gas-phase molecular ions

Data-driven controller validation

H-infinity Controller Design for Spectral MIMO Models by Convex Optimization

Experimental vertical stability studies for ITER performance and design guidance

Indirect Manipulation of a Sphere on a Flat Disk Using Force Information

Frequency-domain controller design by linear programming

Frequency Domain Controller Design by Linear Programming Guaranteeing Quadratic Stability

Data-driven controller tuning with integrated stability constraint

Robust fixed-order H infinity Controller Design for Spectral Models by Convex Optimization

A new tandem mass spectrometer for photofragment spectroscopy of cold, gas-phase molecular ions

Frequency Domain Controller Design by Linear Programming Guaranteeing Quadratic Stability

Robust fixed-order H infinity Controller Design for Spectral Models by Convex Optimization

Integrated Design and Optimization of Gas Bearing Supported Rotors

Indirect Manipulation of a Sphere on a Flat Disk Using Force Information

H-infinity Controller Design for Spectral MIMO Models by Convex Optimization

Frequency-domain controller design by linear programming

Data-driven controller validation

Data-driven controller tuning with integrated stability constraint

Experimental vertical stability studies for ITER performance and design guidance