Wolfgang Nzié
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View article: A new approach to integrating maintainability in design based on fuzzy logic: Case of disassembly, standardization and accessibility
A new approach to integrating maintainability in design based on fuzzy logic: Case of disassembly, standardization and accessibility Open
Maintainability is an important design characteristic of a mechanical system, making various maintenance activities easier. Easily maintainable equipment gives industrialists a real advantage over competitors. Implementing such equipment i…
View article: Dynamic Control of Piezoelectric Sandwich Beams with Multi-Frequency Excitations
Dynamic Control of Piezoelectric Sandwich Beams with Multi-Frequency Excitations Open
In this work, we present a non-linear analysis of the dynamics of a sandwich beam with piezoelectric patches under multi-frequency excitations. The model takes into account geometrical non-linearities, piezoelectric non-linearities, and in…
View article: Modelling of improved LSTM +1D convolution neural network methods for the diagnosis of SKF bearings
Modelling of improved LSTM +1D convolution neural network methods for the diagnosis of SKF bearings Open
The ability to accurately detect and predict faults in automotive bearings is essential for diagnostic applications in the maintenance process. Although previous methods can accurately identify the various faults on bearings, they mostly p…
View article: Failure Prognosis using Dynamic Bayesian Networks and Decision Trees
Failure Prognosis using Dynamic Bayesian Networks and Decision Trees Open
Production managers commonly need to assess the reliability of production equipment throughout its life cycle. Since equipment is typically composed of multiple components, failures may stem from dependencies due to interactions. We have f…
View article: Evaluation of the Reliability of a System: Approach by Monte Carlo Simulation and Application
Evaluation of the Reliability of a System: Approach by Monte Carlo Simulation and Application Open
The objective of this paper is to evaluate the reliability of a system in its different states (absence of failures, partial failure and total failure) and to propose actions to improve this reliability by an approach based on Monte Carlo …
View article: A Maintenance Service Improvement Approach Based on Queue Networks: Application
A Maintenance Service Improvement Approach Based on Queue Networks: Application Open
The quest to increase the performance of production systems that have become complex leads to the transfer to the maintenance function of the responsibility of guaranteeing the availability of such systems. Also, we will never stop saying …
View article: Modeling the Failure Rate of a Standby Multi-Component System and Improving Reliability
Modeling the Failure Rate of a Standby Multi-Component System and Improving Reliability Open
Evaluating the reliability of a system requires knowledge of the failure modes to which it is subject. Complex topology systems generally require a high level of availability, which is a function of the arrangement of elements (components)…
View article: Performance Multicriteria Optimization of Locally Fabricated Hammer Mill using Population Balance Model
Performance Multicriteria Optimization of Locally Fabricated Hammer Mill using Population Balance Model Open
High energy consumption and better prediction of the particle size distribution of outgoing particles in grinding operations are very important issues for manufacturers, so processes need to be optimized to reduce energy consumption and ac…
View article: Facteurs Limitants l'Application des Méthodes de Conception Adaptées a l'Usage dans le Contexte des Pays du Sud: Cas du Cameroun
Facteurs Limitants l'Application des Méthodes de Conception Adaptées a l'Usage dans le Contexte des Pays du Sud: Cas du Cameroun Open
L’activité de conception qui autrefois avait une structure séquentielle a aujourd’hui une structure intégrée avec une multitude d’activités, d’acteurs et de méthodes. Une méthode de conception efficace doit prendre en compte les contextes …
View article: Facteurs Limitants L’application des Methodea de Conception Adaptees a L’usage dans le Contexte des Pays du Sud: Cas du Cameroun
Facteurs Limitants L’application des Methodea de Conception Adaptees a L’usage dans le Contexte des Pays du Sud: Cas du Cameroun Open
L’activité de conception qui autrefois avait une structure séquentielle a aujourd’hui une structure intégrée avec une multitude d’activités, d’acteurs et de méthodes. Une méthode de conception efficace doit prendre en compte les contextes …
View article: Investigative Study on Convective Heat Transfer inside Compartment during Fire Situation
Investigative Study on Convective Heat Transfer inside Compartment during Fire Situation Open
According to the geometry of compartments, quantities of smokes released during fire tend to accumulate at ceiling so as to form a cloud of hot gases. Heat transfer between these hot gases and walls is decisive for the development of fire.…
View article: Optimization of a multi-constraint transport problem using a heuristic approach
Optimization of a multi-constraint transport problem using a heuristic approach Open
A Linear transport problem can be defined as the action of transporting products from "m origins" (or units) to "n destinations" (or customers) at the lowest cost. So the solution to a transportation problem is to organiz…
View article: Optimization of a multi-constraint transport problem using a heuristic approach
Optimization of a multi-constraint transport problem using a heuristic approach Open
A Linear transport problem can be defined as the action of transporting products from "m origins" (or units) to "n destinations" (or customers) at the lowest cost. So the solution to a transportation problem is to organize the transportati…
View article: Coupling of the Finite Element Method (FEM) to the Probabilistic Transformation Method (PTM) in Order to Dimension Lattice Structures
Coupling of the Finite Element Method (FEM) to the Probabilistic Transformation Method (PTM) in Order to Dimension Lattice Structures Open
View article: Semi-Markovian approach to optimizing the time of systematic preventive maintenance and the level of maintenance over a finite horizon
Semi-Markovian approach to optimizing the time of systematic preventive maintenance and the level of maintenance over a finite horizon Open
This work is concerned with the problem of optimizing maintenance policies in terms of economical rewards and availability. We consider a system with multiple states in terms of healthy mode (good state, degraded state and failure state) a…
View article: Analytical Determination of Mechanical Characteristics of Bio-Composites with Reinforcement of Fibers and Particles of Cameroonian's Plants
Analytical Determination of Mechanical Characteristics of Bio-Composites with Reinforcement of Fibers and Particles of Cameroonian's Plants Open
View article: Performance of Unidirectional Biocomposite Developed with Piptadeniastrum Africanum Tannin Resin and Urena Lobata Fibers as Reinforcement
Performance of Unidirectional Biocomposite Developed with Piptadeniastrum Africanum Tannin Resin and Urena Lobata Fibers as Reinforcement Open
International audience
View article: Machine Reliability Optimization by Genetic Algorithm Approach
Machine Reliability Optimization by Genetic Algorithm Approach Open
To define the reliability network of a system (machine), we start with a set of components arranged in an appropriate topology (series, parallel, or parallel-series), choose the best terms of the ratio performance / cost, and gather by lin…
View article: Mechanical System Topology Optimization for Better Maintenance
Mechanical System Topology Optimization for Better Maintenance Open
For a given mechanical equipment, knowing its modular topology has the advantage of facilitating its maintenance. Indeed, during a maintenance problem, we will not act on the whole product except on the failed module (product subsystem) an…
View article: A Proposed Scheme for Fault Discovery and Extraction Using ANFIS: Application to Train Braking System
A Proposed Scheme for Fault Discovery and Extraction Using ANFIS: Application to Train Braking System Open
This paper showcases the use of model oriented techniques for real time fault discovery and extraction on train track unit. An analytical system model is constructed and simulated in Mathlab to showcase the fair and unfair status of the sy…
View article: Maintenance Modularity Optimization using Clustering Algorithm: Application
Maintenance Modularity Optimization using Clustering Algorithm: Application Open
View article: A Valorized Scheme for Failure Prediction Using ANFIS: Application to Train Track Breaking System
A Valorized Scheme for Failure Prediction Using ANFIS: Application to Train Track Breaking System Open
In the rolling stock sector, the ability to protect passengers, freight and services relies on heavy inborn maintenance. Initiating an accurate model suitable to foresee the change of attitude on components when operating rolling stock sys…
View article: Disassembly Evaluation in Design of a System Using a Multi-Parameters Index
Disassembly Evaluation in Design of a System Using a Multi-Parameters Index Open
In order to help designers, consider disassembly in their design activities, a method for evaluation of product disassembly is proposed. Criteria characterizing the disassembility of a product are identified. Each criterion is assigned a c…
View article: Disassembly Evaluation in Design of a System Using a Multi-Parameters Index
Disassembly Evaluation in Design of a System Using a Multi-Parameters Index Open
View article: Analyse Conceptuelle Et Optimisation De La Fiabilité Des Systèmes : Cas D’une Unité De Production De Farines Des Nourrissons
Analyse Conceptuelle Et Optimisation De La Fiabilité Des Systèmes : Cas D’une Unité De Production De Farines Des Nourrissons Open
The purpose of this article is to propose an approach to analyse and optimize the topology of reliability in the design of mechanical systems. The application is made on a chain of production of infant flours. Indeed, the systems that we d…
View article: Modelling and Improving Safety in Production System Design: Overall Approach and by Features, a Case Study
Modelling and Improving Safety in Production System Design: Overall Approach and by Features, a Case Study Open
Enhancing the safety of any production system is a very important aspect in industries nowadays since it greatly reduces losses of resources. Moreover, safety ensures the health of the workers and a risk free environment. Often, most indus…
View article: CONCEPTION ET DIMENSIONNEMENT D’UN EQUIPEMENT DE VANNAGE DE GRAINES DE JATROPHA CURCAS
CONCEPTION ET DIMENSIONNEMENT D’UN EQUIPEMENT DE VANNAGE DE GRAINES DE JATROPHA CURCAS Open
Jatropha curcas L. is a plant resistant to drought, versatile with many attributes and considerable potentials. The most valuable part of the plant is the oil content of the seed kernel. For optimum oil extraction, the seeds must be peeled…