A structural view of fault-tolerant estimation

2007 ◽  
Vol 221 (6) ◽  
pp. 905-914 ◽  
Author(s):  
M Staroswiecki
Keyword(s):  
Structural Analysis ◽  
Fault Tolerant ◽  
Estimation Algorithms

This paper presents a structural view of fault-tolerant estimation algorithms. Structural analysis makes it possible to identify the minimal submodels by which unknown variables can be estimated, both in healthy and in faulty conditions, and to establish a link with critical faults and reliability.

scholarly journals On Fault-Tolerant Partition Dimension of Homogeneous Caterpillar Graphs

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Kamran Azhar ◽  
Sohail Zafar ◽  
Agha Kashif
Keyword(s):  
Absorption Spectrum ◽  
Graph Theory ◽  
Structural Analysis ◽  
Fault Tolerant ◽  
Chemical Compounds ◽  
Numerical Examples ◽  
Benzenoid Hydrocarbon ◽  
Partition Dimension ◽  
Hydrocarbon Molecules ◽  
Uv Absorption Spectrum

Metric-related parameters in graph theory have several applications in robotics, navigation, and chemical strata. An important such parameter is the partition dimension of graphs that plays an important role in engineering, computer science, and chemistry. In the context of chemical and pharmaceutical engineering, these parameters are used for unique representation of chemical compounds and their structural analysis. The structure of benzenoid hydrocarbon molecules is represented in the form of caterpillar trees and studied for various attributes including UV absorption spectrum, molecular susceptibility, anisotropy, and heat of atomization. Several classes of trees have been studied for partition dimension; however, in this regard, the advanced variant, the fault-tolerant partition dimension, remains to be explored. In this paper, we computed fault-tolerant partition dimension for homogeneous caterpillars C p ; 1 , C p ; 2 , and C p ; 3 for p ≥ 5 , p ≥ 3 , and p ≥ 4 , respectively, and it is found to be constant. Further numerical examples and an application are furnished to elaborate the accuracy and significance of the work.

scholarly journals Active Fault Tolerant Control Based on Bond Graph Approach

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Manel Allous ◽  
Nadia Zanzouri
Keyword(s):  
Structural Analysis ◽  
Active Fault ◽  
Control Method ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Bond Graph ◽  
Inverse Control ◽  
Simulation Results ◽  
Active Fault Tolerant Control

This paper proposes a structural fault recoverability analysis using the bond graph (BG) approach. Indeed, this tool enables structural analysis for diagnosis and fault tolerant control (FTC). For the FTC, we propose an approach based on the inverse control using the inverse BG. The fault tolerant control method is also compared with another approach. Finally, simulation results are presented to show the performance of the proposed approach.

scholarly journals Fault Structural Analysis Applied to Proton Exchange Membrane Fuel Cell Water Management Issues

Electrochem ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 604-630
Author(s):  
Etienne Dijoux ◽  
Nadia Yousfi Steiner ◽  
Michel Benne ◽  
Marie-Cécile Péra ◽  
Brigitte Grondin-Perez
Keyword(s):  
Fuel Cell ◽  
Structural Analysis ◽  
Proton Exchange Membrane ◽  
Graphical Representation ◽  
Fault Tolerant ◽  
Cell Structure ◽  
Structural Complexity ◽  
Fault Tolerant Control ◽  
Proton Exchange ◽  
Exchange Membrane

Proton exchange membrane fuel cells are relevant systems for power generation. However, they suffer from a lack of reliability, mainly due to their structural complexity. Indeed, their operation involves electrochemical, thermal, and electrical phenomena that imply a strong coupling, making it harder to maintain nominal operation. This complexity causes several issues for the design of appropriate control, diagnosis, or fault-tolerant control strategies. It is therefore mandatory to understand the fuel cell structure for a relevant design of these kinds of strategies. This paper proposes a fuel cell fault structural analysis approach that leads to the proposition of a structural graph. This graph will then be used to highlight the interactions between the control variables and the functionalities of a fuel cell, and therefore to emphasize how changing a parameter to mitigate a fault can influence the fuel cell state and eventually cause another fault. The final aim of this work is to allow an easier implementation of an efficient and fault-tolerant control strategy on the basis of the proposed graphical representation.

Discrete Fault Diagnosis of Structurally Reconfigurable Systems

2021 ◽  
Author(s):  
Eeshan Deosthale ◽  
Daniel Jung ◽  
Qadeer Ahmed
Keyword(s):  
Fault Diagnosis ◽  
Structural Analysis ◽  
Fault Detection ◽  
Hybrid Systems ◽  
Fault Tolerant ◽  
Automatic Transmission ◽  
Sensor Selection ◽  
Reconfigurable Systems ◽  
Mode Identification ◽  
Selection For

Abstract Fault diagnosis of a certain class of hybrid systems referred to as Structurally Reconfigurable (SR) systems is complicated. This is because SR systems tend to switch their configuration which may or may not be faulty. It is important to identify the mode of the SR system along with the corresponding fault if any, in order to facilitate a fault tolerant action. This paper combines discrete fault diagnosis with mode identification for SR systems to achieve two main objectives: Sensor selection for fault detection, isolation and mode identification, and residual selection for mode identification. The framework is built using a structural analysis based approach to meet these objectives. This framework is demonstrated for a 10-Speed Automatic Transmission, which is an illustrative example of SR systems.

Structural analysis of the surface-layer protein of spirillum serpens by high-resolution electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 738-739
Author(s):  
W. H. Wu ◽  
R. M. Glaeser
Keyword(s):  
Electron Microscopy ◽  
Surface Layer ◽  
Structural Analysis ◽  
High Resolution ◽  
Low Dose ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Surface Layer Protein ◽  
Morphological Unit ◽  
Resolution Electron

Spirillum serpens possesses a surface layer protein which exhibits a regular hexagonal packing of the morphological subunits. A morphological model of the structure of the protein has been proposed at a resolution of about 25 Å, in which the morphological unit might be described as having the appearance of a flared-out, hollow cylinder with six ÅspokesÅ at the flared end. In order to understand the detailed association of the macromolecules, it is necessary to do a high resolution structural analysis. Large, single layered arrays of the surface layer protein have been obtained for this purpose by means of extensive heating in high CaCl2, a procedure derived from that of Buckmire and Murray. Low dose, low temperature electron microscopy has been applied to the large arrays.As a first step, the samples were negatively stained with neutralized phosphotungstic acid, and the specimens were imaged at 40,000 magnification by use of a high resolution cold stage on a JE0L 100B. Low dose images were recorded with exposures of 7-9 electrons/Å2. The micrographs obtained (Fig. 1) were examined by use of optical diffraction (Fig. 2) to tell what areas were especially well ordered.

RNA polymerase: Preparation and structural analysis of helical polymers

1984 ◽  
Vol 42 ◽  
pp. 152-153
Author(s):  
E. Loren Buhle ◽  
Pamela Rew ◽  
Ueli Aebi
Keyword(s):  
Structural Analysis ◽  
Rna Polymerase ◽  
Molecular Level ◽  
X Ray Diffraction ◽  
Helical Polymers ◽  
X Ray ◽  
E Coli ◽  
The Past ◽  
Ordered Arrays ◽  
Low Ionic Strength

While DNA-dependent RNA polymerase represents one of the key enzymes involved in transcription and ultimately in gene expression in procaryotic and eucaryotic cells, little progress has been made towards elucidation of its 3-D structure at the molecular level over the past few years. This is mainly because to date no 3-D crystals suitable for X-ray diffraction analysis have been obtained with this rather large (MW ~500 kd) multi-subunit (α2ββ'ζ). As an alternative, we have been trying to form ordered arrays of RNA polymerase from E. coli suitable for structural analysis in the electron microscope combined with image processing. Here we report about helical polymers induced from holoenzyme (α2ββ'ζ) at low ionic strength with 5-7 mM MnCl2 (see Fig. 1a). The presence of the ζ-subunit (MW 86 kd) is required to form these polymers, since the core enzyme (α2ββ') does fail to assemble into such structures under these conditions.

Sign in / Sign up

Export Citation Format

Share Document