Multivariable extension of global finite‐time HOSM based differentiator for output‐feedback unit vector and smooth binary control
Sign Up to like & getrecommendations! Published in 2019 at "Asian Journal of Control"
DOI: 10.1002/asjc.2030
Abstract: In this paper, we propose a unit vector control law by output feedback to solve the problem of global exact output tracking for a class of multivariable uncertain plants with nonlinear disturbances. In order to… read more here.
Keywords: unit vector; output; differentiator; control ... See more keywords
Augmented nonlinear differentiator design and application to nonlinear uncertain systems.
Sign Up to like & getrecommendations! Published in 2017 at "ISA transactions"
DOI: 10.1016/j.isatra.2016.11.011
Abstract: In this paper, an augmented nonlinear differentiator (AND) based on sigmoid function is developed to calculate the noise-less time derivative under noisy measurement condition. The essential philosophy of proposed AND in achieving high attenuation of… read more here.
Keywords: uncertain systems; differentiator; nonlinear uncertain; nonlinear differentiator ... See more keywords
Design of fractional order differentiator using type-III and type-IV discrete cosine transform
Sign Up to like & getrecommendations! Published in 2017 at "Engineering Science and Technology, an International Journal"
DOI: 10.1016/j.jestch.2016.07.002
Abstract: Abstract In this paper, an interpolation method based on discrete cosine transform (DCT) is employed for digital finite impulse response-fractional order differentiator (FIR-FOD) design. Here, a fractional order digital differentiator is modeled as finite impulse… read more here.
Keywords: differentiator; fractional order; dct; interpolation ... See more keywords
Compact meta-differentiator for achieving isotropically high-contrast ultrasonic imaging
Sign Up to like & getrecommendations! Published in 2024 at "Nature Communications"
DOI: 10.1038/s41467-024-47303-7
Abstract: Ultrasonic imaging is crucial in the fields of biomedical engineering for its deep penetration capabilities and non-ionizing nature. However, traditional techniques heavily rely on impedance differences within objects, resulting in poor contrast when imaging acoustically… read more here.
Keywords: contrast ultrasonic; high contrast; contrast; ultrasonic imaging ... See more keywords
All-optical temporal fractional order differentiator using an in-fiber ellipsoidal air-microcavity
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Semiconductors"
DOI: 10.1088/1674-4926/38/12/126001
Abstract: An all-optical temporal fractional order differentiator with ultrabroad bandwidth (~1.6 THz) and extremely simple fabrication is proposed and experimentally demonstrated based on an in-fiber ellipsoidal air-microcavity. The ellipsoidal air-microcavity is fabricated by splicing a single… read more here.
Keywords: ellipsoidal air; order; differentiator; air microcavity ... See more keywords
Adaptive Backstepping Control Based on Global HOSM Differentiators With Dynamic Gains
Sign Up to like & getrecommendations! Published in 2024 at "IEEE Access"
DOI: 10.1109/access.2024.3407014
Abstract: The present paper proposes the application of global and exact differentiators with dynamic gains based on higher-order sliding modes (HOSM) to the design of adaptive backstepping control for nonlinear uncertain systems of strict-feedback type. The… read more here.
Keywords: control; differentiators dynamic; backstepping control; dynamic gains ... See more keywords
Approximate Differentiator With Varying Bandwidth for Control Tracking Applications
Sign Up to like & getrecommendations! Published in 2021 at "IEEE Control Systems Letters"
DOI: 10.1109/lcsys.2020.3041124
Abstract: Approximate Differentiators have been extensively used in the estimation of joint velocity measurements of industrial manipulators. In this letter, we exploit key differences between the continuous-time model of the first-order Approximate Differentiator, commonly known as… read more here.
Keywords: varying bandwidth; control; approximate differentiator; filter ... See more keywords
A New Varying-Gain-Exponent-Based Differentiator/Observer: An Efficient Balance Between Linear and Sliding-Mode Algorithms
Sign Up to like & getrecommendations! Published in 2020 at "IEEE Transactions on Automatic Control"
DOI: 10.1109/tac.2020.2973609
Abstract: It is well known that the supertwisting algorithm is robust to matched perturbation but is sensitive to measurement noise. Contrary to this, the classical linear algorithm is less sensitive to measurement noise but less robust… read more here.
Keywords: tex math; measurement noise; inline formula; differentiator ... See more keywords
A Linear Differentiator Based on the Extended Dynamics Approach
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Transactions on Automatic Control"
DOI: 10.1109/tac.2022.3183960
Abstract: In this article, we propose a new linear differentiator, called extended dynamics differentiator (EDD), by the extended dynamics approach. By a proper choice of extended dynamics, the EDD can make use of the prior signal… read more here.
Keywords: extended dynamics; dynamics approach; linear differentiator; differentiator based ... See more keywords
Fundamentals and theories for the design of an arbitrary fractional-order all-optical differentiator based on a microring resonator.
Sign Up to like & getrecommendations! Published in 2025 at "Applied optics"
DOI: 10.1364/ao.544844
Abstract: In this paper, we present a complete theory for designing an all-optical time differentiator that enables the realization of arbitrary differentiation orders using the microring resonator (MRR). Based on this theory, a detailed quantitative analysis… read more here.
Keywords: microring resonator; design arbitrary; differentiator; theory ... See more keywords
Isotropic topological second-order spatial differentiator operating in transmission mode.
Sign Up to like & getrecommendations! Published in 2021 at "Optics letters"
DOI: 10.1364/ol.430699
Abstract: Differentiation has widespread applications, particularly in image processing for edge detection. Significant advances have been made in using nanophotonic structures and metamaterials to perform such operations. In particular, a recent work demonstrated a topological differentiator… read more here.
Keywords: transmission mode; topological differentiator; differentiator; mode ... See more keywords