Book ChapterDOI
Frequency-domain modeling of nonlinear multivariable systems
Amir Nassirharand,James Taylor +1 more
- pp 301-305
TLDR
In this article, a frequency-domain technique for input/output (I/O) characterization of stable, multivariable, and highly nonlinear systems (e.g., industrial robots, aerospace vehicles, chemical processes) is presented.Abstract:
A frequency-domain technique for input/output (I/O) characterization of stable, multivariable, and highly nonlinear systems (e.g., industrial robots, aerospace vehicles, chemical processes) is presented. We require only that the nonlinear system is representable in state-variable differential equation form, and that it is possible to integrate the system of equations numerically when input signals are sinusoidal. Otherwise, the technique is not restricted with respect to system order, number of nonlinearities, configuration, or nonlinearity type. The I/O characterization technique involves determining the gain and phase of the nonlinear system response to sinusoidal inputs of various excitation amplitudes at a set of user-defined discrete frequencies. These sinusoidal-input describing function (S1DF) models are obtained by exciting all input channels at one time with sinusoids of different but nearly equal frequencies, integrating the dynamic equations of motion over time, and simultaneously performing a Fourier analysis (evaluating Fourier integrals) on the output signals after they are at steady-state. Repeating this procedure for various amplitude-levels of the excitation signal will result in a number of matrix sinusoidal-input describing function I/O models.read more
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Journal Article
Design of Nonlinear Lead and/or Lag Compensators
TL;DR: In this paper, a known nonlinear compensator design approach is adapted to allow design of nonlinear lead and/or lag compensators, and a number of MATLAB functions are developed that automate the compensators design procedure.
Journal ArticleDOI
Control of Automotive Semi-Active MR Suspensions for In-Wheel Electric Vehicles
Mauricio Anaya-Martinez,Jorge de J. Lozoya-Santos,L. C. Félix-Herrán,Juan C. Tudon-Martinez,Ricardo A. Ramirez-Mendoza,Ruben Morales-Menendez +5 more
TL;DR: This work presents a meta-analyses of the determinants of earthquake-triggered landsliding in central Mexico and its consequences on the number and intensity of landslides and their consequences on seismic activity.
Proceedings ArticleDOI
Time-Domain Synthesis of Dual-Range Controller For Use With Nonlinear Systems
Amir Nassirharand,A. Patwardhan +1 more
TL;DR: A new procedure for synthesis of dual-range linear controllers for use with nonlinear systems as well as linear systems with integrity is presented, which uses a factorization approach coupled with non linear optimization.
Proceedings ArticleDOI
Computer-aided design of nonlinear H ∞ controllers using describing functions
TL;DR: In this article, a computer-aided procedure for design of nonlinear Hinfin controllers for nonlinear plants, whose dynamic and static behavior are highly sensitive to the amplitude level of excitation, is presented.
Proceedings ArticleDOI
Tracking and decoupling of multivariable nonlinear systems
TL;DR: This is the first paper in the area of simultaneous decoupling and signal tracking of multivariable nonlinear systems that is based on the application of the describing function technique and two other algebraic techniques.
References
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