Experimental study on the influence of geometrical parameters on the cavitation erosion characteristics of high speed submerged jets

Vibration and crack detection of a rotor with speed-dependent bearings

Vibration analysis for the comfort assessment of a superyacht under hydrodynamic loads due to mechanical propulsion

A theoretical investigation of the hydrodynamic lubrication of the top compression piston ring in a large two-stroke marine diesel engine is presented. The groove mounted piston ring is driven by t...

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Investigation of different piston ring curvatures on lubricant transport along cylinder liner in large two-stroke marine diesel engines

Ce travail s’inscrit dans la thematique de la detection et localisation de defauts dans les entrainements electriques et en particulier ceux a base de machine asynchrone. Le choix de la machine est justifie par le succes grandissant qu’elle a suscite, notamment, dans les entrainements electriques a vitesse variable.
Les entrainements electriques a base de machine asynchrone sont largement utilises dans les applications industrielles en raison de leurs faibles couts, de leurs performances et de leurs robustesses.
Notre contribution s’interesse a la surveillance et au diagnostic des defauts dans la machine asynchrone tels que les defauts de roulements, les defauts de rupture de barres rotoriques et les defauts de roulements. Dans ce contexte, nous avons propose deux approches de detection de defaut par la surveillance du courant statorique en l’occurrence l’approche signal et l’approche systeme.
L’approche signal, elle se base sur le traitement et l’analyse du signal temporel ou frequentiel du courant statorique.
L’approche modele, qui repose sur les l’observateurs d’etat etendu. Des filtres etendus a base de modele lineaires sont appliques pour le diagnostic

https://hal.archives-ouvertes.fr/tel-01658902/document

Identification paramétrique de la machine asynchrone dédiée au diagnostic

I - Particle and Wear Debris Analysis.- Particles in Lubricating Oils - Sources and Consequences -.- Condition Monitoring of Machine Elements: Particle Separation and Investigation.- Condition Monitoring of Machine Elements - Measuring Methods for Particle Amount and Size.- Lubricants - Indicators for Oil System Damage and Malfunction.- Early Failure Detection by Spectrometric Methods.- Magnetic Methods of Condition Monitoring.- II - Erosion, Fretting Wear And Vibrations Fundamentals.- Cavitation Noise in Centrifugal Pumps.- Load Flow Phenomena and Excitation Forces in Centrifugal Pumps.- Estimation of Erosion Rates and Implosion Pressures in Cavitating Pumps and Cavitation Test Device.- Vibrations and Fretting Wear.- Wear Testing of Materials for Machines.- Wear Analysis of Vanes Pumps Running with Thickened High Water Based Fluids.- Machinery Vibration Measurements and Analysis.- Critical Speeds of Continuous Shaft-Disc Systems.- A Theoretical Study into the Effects of Damped Flexible Foundations on the Dynamic Behaviour of a 66 OMW LP Steam Turbine.- A General Method for Rotordynamic Analysis.- Vibration of Rotor-Bearing Assemblies.- Modal Testing Techniques.- Applications and Advances of Modal Testing.- Modal Testing of Machinery Components.- Solid Particle Erosion in Electric Power Plants.- III - Rotor/Bearing Behaviour.- On Bearing Deformation and Temperature Distribution in Dynamically-Loaded Engine Bearings.- The Control of Rotor Vibration Using Squeeze-Film Dampers.- Flow Efficiency and Excitation in Turbine Stages.- An Electroviscous Damper.- Dynamic Behaviour of Hydrostatic Radial Bearings.- Stability of Rotating Machines Running in Variable Stiffness Bearings.- Gas Bearing Design and Instabilities.- Identification of Stiffness, Damping and Inertia Coefficients of Annular Turbulent Seals.- Identification of Modal Parameters of an Elastic Rotor With Oil Film Bearings.- The Effect of Translational and Conical Bearing Misalignment on the Response and Stability of a Non-Linear Rotor Bearing System.- Stability of Flexible Rotor Supported on Journal Bearings.- Non Linear Effects in Lubricated Bearings.- Foundation Effects in Rotor Dynamic Behaviour.- A Method for Dynamics Calculations of Rotor-Bearing-Foundation Systems.- Dynamic Coefficients for Fluid Film Journal Bearings.- Destabilization of Rotors from Friction in Internal Joints.- IV - Expert Systems and Life Assessment Procedures.- A Survey of Dynamic Loading Conditions on Gear Teeth Contacts.- Remaining Life Evalutation for Steam Turbine Blades.- Remaining Life Evaluation for Steam Turbine Rotors.- A Measurement System for Computer Aided Monitoring of Bearings.- Ten Crucial Concepts Behind Trustworthy Fault Detection in Machine Condition Monitoring.- Some Requirements for Automated Data-Reduction Systems Suitable for Processing Vibration Measurements Taken on High-Speed Rotating Machinery for the Support of Operational and Maintenance Decisions.- An Intelligent Knowledge Based System for Fault Diagnosis in Turbomachinery.- The Use of Rotordynamics Simulation as an Aid for Fault Diagnosis in Turbomachinery.- "Fail-Safe" Concept and Reliability in High-Speed Bearing Arrangements for Aerospace Turbomachinery.- Machinery Diagnostics: Examples of Application to Thermoelectric Plants.- Analyse Fonctionnelle de la Microgeometrie d'un Contact E.H.D.. Critere d'Endommagement en Fatigue Superficielle.

J. M. Montalvão e Silva

Papers

Vibration and wear in high speed rotating machinery