Results 31 to 40 of about 1,968,653 (288)

The fault detection and severity diagnosis of rolling element bearings using modulation signal bispectrum [PDF]

The rolling element bearing is a key part in many mechanical equipment. The accurate and timely diagnosis of its faults is critcal for predictive maintenance. Vibration signals from a defective bearing with a localized fault contain a series of impulsive
Gu, Fengshou, Rehab, Ibrahim, Ball, Andrew, Tian, Xiange   +3 more
core   +3 more sources

Joint state and electromechanical actuator fault estimation in unmanned aerial vehicles using a hybrid bidirectional long short-term memory extended Kalman filter framework

Electrical engineering & Electromechanics
Introduction. Accurate state and electromechanical actuator fault estimation is essential for ensuring reliable navigation and fault-tolerant operation of unmanned aerial vehicles (UAVs) operating under noisy and uncertain environments.
K. Khemiri, K. Abidette, R. Djebali
doaj   +1 more source

Two-Stage Hyperelliptic Kalman Filter-Based Hybrid Fault Observer for Aeroengine Actuator under Multi-Source Uncertainty

Aerospace
An aeroengine faces multi-source uncertainty consisting of aeroengine epistemic uncertainty and the control system stochastic uncertainty during operation.
Yang Wang, Rui-Qian Sun, Lin-Feng Gou
doaj   +1 more source

Sequential Fault-Tolerant Fusion Estimation for Multisensor Time-Varying Systems

Discrete Dynamics in Nature and Society, 2018
In this paper, the impact of the fusion framework on the fault diagnosis process is discussed. The centralized fusion framework makes it difficult to locate and estimate the sensor fault.
Xiaoliang Feng, Lan Wu, Chenglin Wen
doaj   +1 more source

Observer canonical form based robust fault detection and estimation for hyperbolic spatiotemporal dynamic systems

IET Cyber-systems and Robotics, 2020
In this study, the authors propose a novel state and a fault estimation scheme for a class of hyperbolic spatiotemporal dynamic systems in the presence of unknown external disturbance.
Xiaodong Xu, Yuncheng Du, Stevan Dubljevic   +2 more
doaj   +1 more source

Fault Impact Estimation for Lightweight Fault Detection in Image Filtering

IEEE Transactions on Computers, 2022
Classical redundancy-based fault detection techniques, such as Duplication with Comparison (DWC), rely on replicating thecomputation and comparing the replicas' output at a bit-wise granularity. In many application environments these costs are prohibitive,especially when applications are characterized by an intrinsic level of tolerance.
Bolchini C., Boracchi G., Cassano L., Miele A., Stucchi D.   +4 more
openaire   +3 more sources

Fault Estimation Method for Nonlinear Systems With Perturbations Based on Augmented Fault Observer

IEEE Access
This paper proposes a robust fault estimation method for nonlinear systems with both actuator and sensor faults. Specifically, a singular system is constructed by combining the state vector of the system with the fault vector of the sensor, and an ...
Yanxiu Sun, Ying Du, Yuping Zhang
doaj   +1 more source

Robust dynamic output feedback fault-tolerant control for Takagi-Sugeno fuzzy systems with interval time-varying delay via improved delay partitioning approach

Open Mathematics, 2016
This paper addresses the problem of robust fault-tolerant control design scheme for a class of Takagi-Sugeno fuzzy systems subject to interval time-varying delay and external disturbances.
Sun Chao, Wang Fuli, He Xiqin
doaj   +1 more source

Early Body Mass Index z‐Score Change and Resolution of Severe Malnutrition in Children With Sickle Cell Anemia in a Low‐Income Setting: A Prospective Single‐Arm Extension Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Children with sickle cell anemia (SCA) in low‐income settings are at risk of severe malnutrition, but optimal nutritional management has not been established. We evaluated an intensified ready‐to‐use therapeutic food (RUTF) regimen in children with persistent severe malnutrition after initial treatment and assessed whether early ...
Safiya Gambo, Shehu Umar Abdullahi, Hassan Adam Murtala, Halima Kabir, Khadija A. Shamsu, Sari A. Acra, Virginia A. Stallings, Mark Rodeghier, Michael R. DeBaun, Lauren J. Klein   +9 more
wiley   +1 more source

Retrospective Analysis of Donor Lymphocyte Infusions in Pediatric Patients With Mixed Chimerism After Hematopoietic Stem Cell Transplantation

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Allogeneic hematopoietic stem cell transplantation (alloHSCT) is an essential therapy for several malignant and nonmalignant diseases, but relapse and graft loss remain the principal threats to its success. Routine monitoring of chimerism and minimal residual disease (MRD) enables early detection of imminent recurrence and guides ...
Carmen Junk, Sebastian Michaelis, Michaela Döring, Thomas Eichholz, Ursula Holzer, Martin Ebinger, Tim Flaadt, Rupert Handgretinger, Peter Lang, Jan Frederic Weller, Markus Mezger   +10 more
wiley   +1 more source