نتایج جستجو برای: روش mrac sdre

تعداد نتایج: 369985  

2014
Nadia Akkari Abdelaziz Chaghi Rachid Abdessemed

This paper presents the analysis and simulation of the control of double star induction motor, using direct torque control (DTC) based on model reference adaptive control algorithm (MRAC). The DTC is an excellent solution for generalpurpose induction drives in very wide range the short sampling time required by the TC schemes makes them suited to a very fast torque and flux controlled drives as...

Journal: :Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2015
Abolfazl Mehranian Habib Zaidi

UNLABELLED The joint maximum-likelihood reconstruction of activity and attenuation (MLAA) for emission-based attenuation correction has regained attention since the advent of time-of-flight PET/MR imaging. Recently, we improved the performance of the MLAA algorithm using an MR imaging-constrained gaussian mixture model (GMM). In this study, we compare the performance of our proposed algorithm w...

Journal: :Physics in medicine and biology 2015
Abolfazl Mehranian Habib Zaidi

In standard segmentation-based MRI-guided attenuation correction (MRAC) of PET data on hybrid PET/MRI systems, the inter/intra-patient variability of linear attenuation coefficients (LACs) is ignored owing to the assignment of a constant LAC to each tissue class. This can lead to PET quantification errors, especially in the lung regions. In this work, we aim to derive continuous and patient-spe...

Journal: :Energies 2021

A model reference adaptive control and fuzzy neural network (FNN) synchronous motion compensator for a gantry robot is presented in this paper. This paper proposes the development application of robots with MRAC FNN online compensators. First, we propose controller (MRAC) under cascade method to make close real reduce tracking errors single axis. Then, proposed compensate between dual servo mot...

Journal: :Expert Systems With Applications 2021

Both recognition and 3D tracking of frontal dynamic objects are crucial problems in an autonomous vehicle, while depth estimation as essential issue becomes a challenging problem using monocular camera. Since both camera moving, the can be formed structure from motion (SFM) problem. In this paper, to elicit features image, YOLOv3 approach is utilized beside OpenCV tracker. Subsequently, obtain ...

2014
Xiaoping Zong Miao Zhang Peiguang Wang

This paper presents the adaptive control parameter identification of switched nonlinear system that uses model reference adaptive control (MRAC) method to track the variation of the state error to approach the ideal values. MRAC is treated as a class of switched nonlinear systems in which the unknown parameters appear linearly. At the same time, switched systems ensure the whole system stay sta...

2015

This paper presents a comparative analysis of continuously stirred tank reactor (CSTR) control based on adaptive control and optimal tuning of PID control based on particle swarm optimization. In the design of adaptive control, Model reference adaptive control (MRAC) scheme is used, in which the adaptation law have been developed by MIT rule & Lyapunov’s rule. In PSO control parameters of PID c...

2001
Kyung-Jinn Yang Seung-Hwan Lee

In this paper, a robust MRAC (model reference adaptive control) for a linear parabolic partial differential equation with unknown time-varying parameters and bounded disturbance is investigated. In the adaptive control of time-varying plants, the derivative of a Lyapunov function candidate, which allows the derivation of adaptation laws, is not negative semi-definite in general. Under the assum...

2014
B. RAJASEKHAR

A novel speed estimation approach with control system based on model reference adaptive control (MRAC) is presented for low cost brushless dc motor drives with low-resolution hall sensors. The back EMF is usually used to estimate speed. But the estimation result is not accurate enough at low speeds because of the divided voltage of stator resistors and too small back EMF. Moreover, the stator r...

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