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Design of multivariable linear‐quadratic controllers using transfer functions
AIChE Journal, 1987AbstractOptimal linear‐quadratic (LQ) controller design is usually associated with state space techniques. However, when one has measurements of the outputs to be controlled, there are many advantages to designing these LQ controllers using input‐output transfer function models.
T. J. Harris, J. F. Macgregor
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Quadratic-inverse estimates of transfer functions
[1992] IEEE Sixth SP Workshop on Statistical Signal and Array Processing, 2003Estimating transfer functions between time series is essentially regression in the frequency domain but significant differences occur when the available data sequences are short. The author suggests an estimate of transfer functions on narrow, overlapping frequency bands using a quadratic-inverse formalism.
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The Estimation of “Transfer Functions” of Quadratic Systems
Technometrics, 1961In recent years the use of stationary random inputs as a forcing function to experimentally determine the transfer function of linear systems has become widespread. The procedure involves the measurement of spectra and crossspectra between the input and output and the formation of the proper ratio.
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Use of Quadratic Transfer Functions to Predict Response of Tension Leg Platforms
Journal of Engineering Mechanics, 1996Higher-order nonlinear transfer functions are applied to model the computed nonlinear responses obtained from the dynamic analysis of a tension leg platform (TLP). Under the nonlinear wave-loading condition considered in the present study, the horizontal motion of TLP exhibits a significant amount of response components at frequencies that are outside ...
Inyeol Paik, Jose M. Roesset
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Loopshaping by quadratic constraints on open-loop transfer functions
2007The purpose of this note is to propose to execute loopshaping by imposing quadratic constraints on open-loop transfer functions. Quadratic constraints are defined to be consistent with feedback stable systems. Then, a robust stability analysis and a loopshaping method under quadratic constraints on open-loop transfer functions are given.
Ichijyo Hodaka +2 more
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Open-loop small-signal transfer functions of the quadratic buck PWM DC-DC converter in CCM
IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014The quadratic buck converter or the BUCK converter presents a non-linear dc-dc voltage conversion ratio. The large-signal model of the quadratic buck converter would possess greater number of higher order nonlinear ac terms compared to that of the conventional buck converter. One can gain better insight by considering the linear model to understand the
Agasthya Ayachit, Marian K. Kazimierczuk
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Offshore Technology Conference, 1982
ABSTRACT Digital cross-inspectoral analysis techniques are used to determine quadratic transfer functions (QTF'?s) which model the nonlinear -relationship between the high frequency sea wave input and the low frequency response of a vessel-mooring system.
Edward J. Powers +3 more
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ABSTRACT Digital cross-inspectoral analysis techniques are used to determine quadratic transfer functions (QTF'?s) which model the nonlinear -relationship between the high frequency sea wave input and the low frequency response of a vessel-mooring system.
Edward J. Powers +3 more
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Renewable Energy, 2020
Abstract Second-order components of the wave loads on floating wind turbines may induce severe resonance at the natural frequencies of the structures and result in fatigue damage. A conceptual semi-submersible platform for the DTU 10 MW Wind Turbine was introduced and simulated by FAST to obtain the second-order responses under steady winds with ...
Qun Cao +3 more
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Abstract Second-order components of the wave loads on floating wind turbines may induce severe resonance at the natural frequencies of the structures and result in fatigue damage. A conceptual semi-submersible platform for the DTU 10 MW Wind Turbine was introduced and simulated by FAST to obtain the second-order responses under steady winds with ...
Qun Cao +3 more
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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 2006
A simple analytical model based on Delayed Quadratic (DQ) Transfer Function approximation is proposed for estimating waveforms of inductive single-line interconnects in VLSI's. An expression for overshoot voltage is derived by the model within 17% error for the line width less than 10 times the minimum line width and typical input signal.
Danardono Dwi Antono +3 more
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A simple analytical model based on Delayed Quadratic (DQ) Transfer Function approximation is proposed for estimating waveforms of inductive single-line interconnects in VLSI's. An expression for overshoot voltage is derived by the model within 17% error for the line width less than 10 times the minimum line width and typical input signal.
Danardono Dwi Antono +3 more
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Offshore Technology Conference, 1978
ABSTRACT This report discusses the functional series approach to the analysis of nonlinear responses of offshore structures as can be measured in model tests. Emphasis is laid on the second order slowdrift oscillations. A short theoretical discussion of the problem is given.
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ABSTRACT This report discusses the functional series approach to the analysis of nonlinear responses of offshore structures as can be measured in model tests. Emphasis is laid on the second order slowdrift oscillations. A short theoretical discussion of the problem is given.
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