Abstract
This article introduces a new H∞ loop-shaping control to decrease the complexity of the appropriate selection of the required performance for a coaxial rotor helicopter with unpredicted or unknown unstructured uncertainties. Uncertainty models are normally assumed that some knowledge of type is known. And to model a particular uncertainty as a separate model is necessary in the high-performance design of specified applications. But to model each particular uncertainty will increase the complexity of performance design for the extremely complex plant. H∞ loop-shaping control provides a competitive and flexible choice to simultaneously represent a family of unpredicted and unconsidered unstructured uncertainty bounded by H∞ norm. Many researches have been conducted to consider some aspects of this method, for example, the nominal stability, robustness to uncertainty, and implementation issues. However, to decrease the complexity of the appropriate selection of the required performance was not considered ser...
Highlights
There has become a resurgence of interest in the coaxial rotor configuration because of its potential to achieve high speed, long range, and heavy lift when it was used for a compound helicopter.[1,2] A coaxial rotor helicopter is severely nonlinear dynamic, poor model uncertainty, and strong coupling
DM and DN stand for a family of unpredicted or unconsidered uncertainties in additive and multiplicative uncertainty formulation; 1=e stands for the maximum size of unpredicted and unconsidered uncertainties
This article introduces a new H‘ loop-shaping control to decrease the complexity of the appropriate selection different values of m
Summary
There has become a resurgence of interest in the coaxial rotor configuration because of its potential to achieve high speed, long range, and heavy lift when it was used for a compound helicopter.[1,2] A coaxial rotor helicopter is severely nonlinear dynamic, poor model uncertainty, and strong coupling. H‘ control technique in the context of coprime factor uncertainty model, known as H‘ loop shaping, has an inherent advantages than other methods to address a class of unpredicted or unknown unstructured uncertainties in performance design of the reliable control for a coaxial rotor helicopter. A new H‘ loop-shaping control is proposed to decrease the complexity of the appropriate selection of the required performance and the complexity of simultaneously representation of unpredicted or unconsidered unstructured uncertainties for the coaxial rotor helicopter. Resulting controllers show that the proposed method can provide a good level of robustness and the achievable performance by choosing the different value of the parameter This passive method contributes a flexible way to achieve the satisfied performance through an additional degree of freedom and to decrease the complexity of specifying a class of unpredicted and/or unconsidered uncertainties.
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