scholarly journals Oscillatority Conditions for Nonlinear Systems with Delay

2007 ◽  
Vol 2007 ◽  
pp. 1-12 ◽  
Author(s):  
Denis V. Efimov ◽  
Alexander L. Fradkov
Keyword(s):  
Computer Simulation ◽  
Time Delay ◽  
Nonlinear Systems ◽  
Lower Bounds ◽  
Oscillation Amplitude ◽  
Sufficient Conditions ◽  
Upper And Lower Bounds ◽  
Analytical Results

Sufficient conditions for oscillatority in the sense of Yakubovich for a class of time delay nonlinear systems are proposed. Under proposed conditions, upper and lower bounds for oscillation amplitude are given. Examples illustrating analytical results by computer simulation are presented.

Unknown input fractional-order functional observer design for one-side Lipschitz time-delay fractional-order systems

2019 ◽  
Vol 41 (15) ◽  
pp. 4311-4321 ◽  
Author(s):  
Mai Viet Thuan ◽  
Dinh Cong Huong ◽  
Nguyen Huu Sau ◽  
Quan Thai Ha
Keyword(s):  
Time Delay ◽  
Nonlinear Systems ◽  
Fractional Order ◽  
Sufficient Conditions ◽  
Quadratic Function ◽  
Observer Design ◽  
Linear Matrix ◽  
Unknown Input ◽  
Functional Observer ◽  
The One

This paper addresses the problem of unknown input fractional-order functional state observer design for a class of fractional-order time-delay nonlinear systems. The nonlinearities consist of two parts where one part is assumed to satisfy both the one-sided Lipschitz condition and the quadratically inner-bounded condition and the other is not necessary to be Lipschitz and can be regarded as an unknown input, making the wider class of considered nonlinear systems. By taking the advantages of recent results on Caputo fractional derivative of a quadratic function, we derive new sufficient conditions with the form of linear matrix inequalities (LMIs) to guarantee the asymptotic stability of the systems. Four examples are also provided to show the effectiveness and applicability of the proposed method.

scholarly journals Conditions of Functional Null Controllability for Some Types of Singularly Perturbed Nonlinear Systems with Delays

Axioms ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 80 ◽  
Author(s):  
Valery Y. Glizer
Keyword(s):  
Time Delay ◽  
Nonlinear Systems ◽  
Singular Perturbation ◽  
Sufficient Conditions ◽  
Null Controllability ◽  
Singularly Perturbed ◽  
Controlled Systems

Two types of singularly-perturbed nonlinear time delay controlled systems are considered. For these systems, sufficient conditions of the functional null controllability are derived. These conditions, being independent of the parameter of singular perturbation, provide the controllability of the systems for all sufficiently small values of the parameter. Illustrative examples are presented.

New Analysis/Design of Generalized Discrete PI Controller via Discrete Time Delay Control for Nonlinear Systems

2020 ◽  
Author(s):  
Suresh B. Reddy
Keyword(s):  
Time Delay ◽  
Nonlinear Systems ◽  
Discrete Time ◽  
Linear Time ◽  
Sufficient Conditions ◽  
Pi Controller ◽  
Pid Controllers ◽  
Analysis And Design ◽  
Proportional Integral ◽  
Discrete Time Delay

Abstract Proportional-Integral (PI) and Proportional-Integral-Derivative (PID) controllers are among the most common schemes for control since their formulation nearly a century ago. They have been very successful in many applications, even as we have migrated from analog implementations to digital control systems. While there is rich literature for design and analysis of PI/PID controllers for linear time-invariant systems with modeled dynamics, the tools for analysis and design for nonlinear systems with unknown dynamics are limited, despite their known effectiveness. This paper extends previous observations about a form of discrete Time Delay Control’s equivalence to a generalized PI controller for more general canonical systems, with additional complimentary feedback linearization of known dynamics, as desired. In addition, sufficient conditions for Bounded Input-Bounded Output (BIBO) as well as exponential stability are developed in this paper for the form of discrete TDC that is closest to generalized discrete PI equivalent controller, for multi-input multi-output nonlinear systems, including nonaffine cases. Accordingly, design procedures are suggested for such discrete TDC, and generalized discrete PI controller for nonlinear systems.

scholarly journals Finite-time stability of multiterm fractional nonlinear systems with multistate time delay

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
G. Arthi ◽  
N. Brindha ◽  
Yong-Ki Ma
Keyword(s):  
Time Delay ◽  
Nonlinear Systems ◽  
Finite Time ◽  
Sufficient Conditions ◽  
The Novel ◽  
Finite Range ◽  
Time Stability ◽  
Finite Time Stability ◽  
Fractional System ◽  
The Stability

AbstractThis work is mainly concentrated on finite-time stability of multiterm fractional system for $0 < \alpha _{2} \leq 1 < \alpha _{1} \leq 2$ 0 < α 2 ≤ 1 < α 1 ≤ 2 with multistate time delay. Considering the Caputo derivative and generalized Gronwall inequality, we formulate the novel sufficient conditions such that the multiterm nonlinear fractional system is finite time stable. Further, we extend the result of stability in the finite range of time to the multiterm fractional integro-differential system with multistate time delay for the same order by obtaining some inequality using the Gronwall approach. Finally, from the examples, the advantage of presented scheme can guarantee the stability in the finite range of time of considered systems.

scholarly journals Upper and lower bounds of integral operator defined by the fractional hypergeometric function

2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Rabha W. Ibrahim ◽  
Muhammad Zaini Ahmad ◽  
Hiba F. Al-Janaby
Keyword(s):  
Integral Operator ◽  
Hypergeometric Function ◽  
Lower Bounds ◽  
Analytic Functions ◽  
Hypergeometric Functions ◽  
Sufficient Conditions ◽  
Integral Operators ◽  
Holomorphic Functions ◽  
Upper And Lower Bounds ◽  
Distortion Theorems

AbstractIn this article, we impose some studies with applications for generalized integral operators for normalized holomorphic functions. By using the further extension of the extended Gauss hypergeometric functions, new subclasses of analytic functions containing extended Noor integral operator are introduced. Some characteristics of these functions are imposed, involving coefficient bounds and distortion theorems. Further, sufficient conditions for subordination and superordination are illustrated.

Absolute Stability Criteria of Lurie-Type Nonlinear Systems With MIMO Bounded Time-Delays

2003 ◽  
Author(s):  
Shuli Guo ◽  
Shaoze Yan ◽  
Shizhu Wen
Keyword(s):  
Time Delay ◽  
Nonlinear System ◽  
Nonlinear Systems ◽  
Time Delays ◽  
Absolute Stability ◽  
Sufficient Conditions ◽  
Stability Criteria

The time delay of Lurie nonlinear system is systems is estimated in which the origin of the nonlinear systems is absolute stability by using a Liapunov-Razumikhn function. Many sufficient conditions are obtained about absolute stability criteria of nonlinear systems. A example is presented to explain the strange time delay phenomena.

Limit Analysis of Nonsymmetrically Loaded Spherical Shells

1972 ◽  
Vol 39 (2) ◽  
pp. 422-430 ◽  
Author(s):  
S. Palusamy ◽  
N. C. Lind
Keyword(s):  
Lower Bounds ◽  
Limit Analysis ◽  
Upper And Lower Bounds ◽  
Spherical Shells ◽  
Limit Loads ◽  
Analytical Results

Upper and lower bounds are found for limit loads on nonsymmetrically loaded spherical shells. The influence of geometrical and load parameters are discussed. The analytical results are compared with the results of tests on four steel models.

BLOCH AMPLITUDES AND ENERGY OF SLOW LIGHT IN A TAPERED GRATING

2006 ◽  
Vol 15 (03) ◽  
pp. 381-400
Author(s):  
THEO P. VALKERING
Keyword(s):  
Energy Density ◽  
Band Gap ◽  
Transfer Matrix ◽  
Lower Bounds ◽  
Slow Light ◽  
Standing Waves ◽  
Upper And Lower Bounds ◽  
Coupled Mode ◽  
Analytical Results

Bloch amplitudes and energy density for traveling and standing waves in an apodized grating at frequencies just outside the band gap are investigated. On the basis of exact coupled mode equations for the local Bloch amplitudes, based on the transfer matrix of the grating units, the concept of local reflectance is developed. This concept appears to be particularly useful to find upper and lower bounds on amplitudes and energy density. Analytical results are tested numerically for a polynomial apodization profile.

The stability analysis of nonlinear switched systems with time delay in input and states with stable and unstable subsystems

2018 ◽  
Vol 40 (16) ◽  
pp. 4298-4308 ◽  
Author(s):  
Zeinab Echreshavi ◽  
Alireza Roosta
Keyword(s):  
Time Delay ◽  
Nonlinear Systems ◽  
Sufficient Conditions ◽  
Switched System ◽  
Control Laws ◽  
Nonlinear Switched Systems ◽  
Unstable Subsystems ◽  
Measurement Delay ◽  
The Stability ◽  
System With Time Delay

Time delay and sampling appear in many industrial systems. It is irrefutable that applying measurement delay with controls can cause the sampling of control laws with the delay in the behavior of nonlinear control systems. As a result, in this paper, the stability of nonlinear time varying switched system with time delay in the input and the states of the system is studied in two modes by a new Lyapunov Krasovskii functional (LKF). Firstly, if all subsystems of the proposed nonlinear switched system with time delay are stable. Then, if some of the subsystems of the proposed switched system are unstable. This paper is organized in two steps. In the first step, the upper bound for the time delay under sufficient conditions in the nonlinear systems with time delay in input and states is obtained. In this step, the Uniformly Globally Asymptotic Stability is proved for nonlinear systems with the presence of time delay. In the second step, with a proper Lyapunov Krasovskii functional, the global exponential stability of the proposed switched system is proved. Also, finally a proper observer is designed for our proposed switched system in two stable and unstable modes.

Modeling and Fuzzy Control for Complex Flexible Nonlinear Systems with Time-Delay

2014 ◽  
Vol 602-605 ◽  
pp. 920-923
Author(s):  
Ji Xiang Chen
Keyword(s):  
Time Delay ◽  
Feedback Control ◽  
Nonlinear Systems ◽  
Discrete Time ◽  
State Feedback ◽  
Sufficient Conditions ◽  
State Feedback Control ◽  
Linear Matrix ◽  
Control Approach ◽  
Fuzzy State

A time-delay discrete-time fuzzy singularly perturbed modeling and fuzzy state feedback control approach are presented for a class of complex flexible nonlinear systems with time-delay. The considered flexible nonlinear system is firstly described by a time-delay standard discrete-time fuzzy singular perturbation model. A fuzzy state feedback control law is secondly design. By using a matrix spectral norm and linear matrix inequalities approach, the sufficient conditions of the controller existence are divided. The provided controller not only can stabilize the resulting closed-loop system but also overcome the effects caused by both time-delay and external disturbances. A simulation example is given to illustrate the effectiveness of the developed result.

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