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Chronological

Galling detection by acoustic emission according to ASTMG98

Date : 05/15/2019

Scientific and technical publications
2nd Edition Metallic Materials and Processes: Industrial challenges 25-27 October 2017 – Deauville - France For many mechanical companies: galling remains an important issue (could lead to serious failures with consequences both in terms of production and in terms of people and machines safety). Currently, diagnosis and identification of galling are made through facies observations and profilometry analysis (according to ASTM G98). When contac...

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Thermomechanichal study of high speed rolling element bearing: a simplified approach

Date : 05/15/2019

Scientific and technical publications
Rolling element bearing (REB) is an essential component in mechanical transmission because it reduces friction between two rotating parts. Two main approaches to evaluate power losses are proposed in literature: i) global engineering models using few input data; ii) local models which are more accurate but need much more information on rolling element bearing geometry. Based on thermal network approach, an intermediate model is developed in this stu...

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Robust Active Control of The Milling Process Vibrations in a fixed reference frame

Date : 05/09/2019

Scientific and technical publications
The milling process is the most used machining operation for finishing complex parts. The vibrations often impact the results, sometimes generating very important cost because of the lack of quality for high value parts. The chatter phenomenon is associated with unstable vibration in machining and can lead to accelerated wear and eventually failure of both the cutting tool and the machine tool. It is often the main factor that limits productivity, acc...

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3D numerical simulation of drilling residual stresses

Date : 05/09/2019

Scientific and technical publications
Drilling can a affect the integrity of the surface of a mechanical component and reduce its fatigue life. Thus, drilling parameters such as lubrication or drilling velocity must be optimized to ensure a satisfactory residual mechanical state of the hole surfaces. Unfortunately, experimental tests are time consuming and it is not easy to observe the cutting process because of the confinement of the drill zone. The literature does not exhibit any numeri...

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Influence of the lubrication conditions on surface integrity in drilling

Date : 05/09/2019

Scientific and technical publications
Drilling is largely used to manufacture mechanical components in the aeronautical and nuclear industries. Industrialists need to understand this process in-depth so as to master the manufacturing of parts and ensure their service life. However, studying this process is complicated; the hole is confined and it is hard to observe physical phenomena directly during the drilling process. The aim of this article is to present an experimental study of the d...

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Vibroacoustic source separation using an improved cyclic Wiener filter

Date : 03/05/2019

Scientific and technical publications
Noise radiated by rotating and reciprocating machines is often a mixture of multiple complex sources, the successful reduction of which is a research field of intensive research. In this paper an advanced source separation approach is pre-sented, based on cyclic Wiener filtering, which takes into account the cyclosta-tionarity property of the signals. The aim of the Wiener filter is the separation of noisy measurements their contributions from the spe...

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An inverse approach based on compression test for the localization and identification of defect: a first attempt

Date : 03/05/2019

Scientific and technical publications
Auteurs : Eléna Barbarella, Olivier Allix, Fédérica Daghia : LMT-Cachan, 94230, U. Paris Saclay, Cachan, France Thomas Jollivet : CETIM, Pôle Ingénierie Polymères & Composites, Technocampus, Bouguenais, France

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Predicting Sound Quality of an automotive HVAC using Acoustic Synthesis

Date : 02/26/2019

Scientific and technical publications
The sound quality of an automotive HVAC is evaluated using psycho-acoustic descriptors, law of merit and sound samples. To provide narrow bands spectrum considering several design options, the approach of the acoustic synthesis has been chosen as it allows the virtual prototyping of a mechanical system. A preliminary study identifies the substructures such as components (fan, flap and heat exchanger) or geometries having an influence on the noise. The...

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Enhancement of the Total Focusing Method Imaging for Immersion Testing of Anisotropic Carbon Fiber Composite Structures

Date : 02/26/2019

Scientific and technical publications
The use of composite structures has importantly increased because of their reduced weight, assembly simplification and excellent specific strength and stiffness. The multiple possibilities of their manufacturing allow today to integrate within a single structure multiple functions: design, mechanical strength, multi-material…These structures, by their geometric and structural complexity (anisotropy, attenuation and scattering noise), do not always all...

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Acoustic emission testing –a new way to evaluate an acoustic emission instrumentation : the ‘cats’ methodology

Date : 02/12/2019

Scientific and technical publications
Acoustic Emission (AE) is nowdays widely used in the world, in order to evaluate the integrity of many types of structures, such as pressure vessels, reactors, storage tanks, concrete structures, Aerospace structures, … Several regulatory rules exist for acoustic emission testing (AT) around the world and allow AE testing based on two operational modes (zonal location and planar source location methods). However, the different regulation texts have no...

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