CM 2018 in Delft, Netherlands: Rail joint dynamic forces computations, including rail plasticity

Vibratec will present a publication which is divided in two subjects:

  • Benchmark of 3D FE model compared to simplified model, to compute wheel-rail contact forces at rail joints: the objective is to validate the simplified approach in order to perform fast parametric variations
  • Computations of contact force including rail plasticity using 3D FEM: the objective is to assess the influence of plasticity on the contact force amplitude.

The subject started with SNCF, for which 3D FE models were developed to compute dynamic force for fatigue assessment.

VIBRATEC then decided to enhance the model by including rail plasticity (Chaboche model) and compared it to other numerical model, in collaboration with IFSTTAR, who developed the VOCO software which is used for parametric variations


September 2018 International Railway Conference : ‘Rad-Schiene’ in Dresden

The French collaborative railway research project CERVIFER aims at accelerating Virtual Certification of Railway Systems. In this framework, computer models are used to compute the train-track interaction during the passage of switches.

From a geometrical description of a VOSSLOH switch and dynamic contact forces from measurements performed on an RATP commuter train, VIBRATEC built a multi-body model with the software VOCO, developed by IFSTTAR.

At the 16th International Railway Conference “Rad-Schiene” in Dresden, VIBRATEC specialist Martin Rissmann will present the difficulties and challenges of such models and the need of high quality measurement data.


Dealing with gear noise of real industrial systems: an overview of the difficulties and the achievements

Alexandre CARBONELLI will present the philosophy of the research led by VibraTec in the gear dynamics field at the International Gear Conference in Lyon-Villeurbanne from August 27th to 29th.

 The presentation gives general feedback on the latest studies and on the position of a research engineer working in the gear dynamics field.

 Between academic science and the pragmatic constraints of the engineer’s job, it is important to have a strong expertise in order to work with the correct assumptions and the appropriate tools.

The close collaboration with the Laboratory of Tribology and System Dynamics (LTDS) of the Ecole Centrale de Lyon makes it possible to invest research efforts to answer real industrial concerns.


dynamic gear studies

There’s still time to use your 2018 training budgets

We’ll be holding open course sessions throughout the month of November.

  • The 7th and 8th will give the opportunity to learn about “Vibration-Induced Pipework Failure”: the issues surrounding piping vibration phenomena, current screening & assessment methods, and ‘Likelihood of Failure’ (LOF) calculations, good practice regarding both pipework design and on-site troubleshooting.
  • Our “Experimental Modal Analysis” course will be held on the 14th & 15th. It will present this structural characterization technique, how & when to use it – including hands-on applications.
  • The 20th through 22nd will be dedicated to “Rotating Equipment Vibration Diagnosis”: the perfect occasion to learn more about rotating machines in their various forms and industrial applications. Theoretical and practical aspects will be addressed, enabling participants to identify rotating equipment vibration defaults, understand diagnosis tools and propose mitigation.
  • Rotor Dynamics” on the 23rd, as a complement to the Rotating Equipment course or on a stand-alone basis: in order to hold intelligent, pertinent discussions with suppliers – and know the ‘right’ questions to ask.
  • Last but not least, the 27th, 28th and 29th will provide training on the “Resistance / stress Reliability Approach”: present an overview of the issues pertaining to reliability and product life cycles in product development, give understanding of the resistance / stress reliability approach and notions of how to apply it to product design – using case studies from our 30 years of experience.

VibraTec is a training center recognized by the French administration and French professional training funding centers.

Technical training

ShareLab – invite yourself to VibraTec !

Do you wonder about the vibration or acoustic behavior of your products and think that measurements would clarify things ?

VibraTec welcomes you to our lab and gives you free access to our sensors, data acquisition systems and facilities.

One day a month, you can set up shop at one of our test benches (with or without gantry crane) or in our semi-anechoic chamber and use our large stock of equipment (microphones, accelerometers, acoustic arrays, multi-channel analyzers, recorders, etc.) An in-house expert will be on hand to get you started.

Take advantage of this opportunity: schedule the date, then just come and install your equipment, do your testing and leave with results that you can analyze back in the office.

Sign up now: our dates this fall:

  • September 28th
  • October 26th
  • November 30th

sharing measurement equipment

Improve your skills in our October training sessions

The perfect occasion to upskill colleagues before the end-of-year stress:

  • Acoustics will be in the spotlight from the 2nd through the 4th, for the “Acoustics of Muffler Design” program, presenting muffler design principles, experimental methods, analysis software and pressure-drop & thermal distribution calculations.
  • October 10th & 11th will clarify “Signal Processing”, providing an overview of various signal processing methods applied to acoustics and vibration, characteristics and criteria to choose among the different types of treatment.
  • The 16th through the 18th will give you 3 days to get the global picture concerning railway noise – vibration – reliability applied to three aspects of railway activity:
    • Understanding railway noise, vibration & reliability,
    • Establishing design and testing methods and procedures,
    • Managing issues relating to both main lines (high-speed / freight trains) and urban conditions (subway / tramway).

VibraTec is a training center recognized by the French administration and French professional training funding centers. There are still openings for our sessions in October – why not try one out ?

continued education

VibraTec – European partner for tomorrow’s cities

Horizon 2020, the European Research & Innovation Framework Program, plays an important role in local scientific and socio-economic development. Regional information sessions are organized in order to:

  • Motivate the various research and innovation actors with feedback from local experience from current Horizon 2020 participants.
  • Enable discussion and networking among these actors to facilitate the development of European projects.

VibraTec has participated in collaborative projects for more than 2 decades and is well-known in the Auvergne-Rhone-Alps R&D community. At a recent information session, our Scientific Director, Christian CLERC, presented one of our current European projects: MAVICO – COnnected MAintenance using VIbration measurements.

MAVICO uses dynamic response to monitor asset condition. Its original application is for tramways.

Using “expert” algorithms, the connected autonomous sensor can optimize maintenance and prevent incidents. Tomorrow, associated digital tweens will play an important role in managing both rolling stock and infrastructure lifetime.

More information on our railway activity herecontact us for other applications


Acoustic design of Trains and Tracks

Proper acoustic design of rolling stock and track requires you to assign qualitative and quantitative targets to each piece of equipment, validate your choices, and identify problematic noise sources.

The railway experts of Vibratec can help you all along this process: from the characterization of acoustic sources and airborne and structure-borne transfer paths to the simulation and measurement of interior and exterior noise as well as ground borne vibration, troubleshooting, and optimization of equipment.

Using cutting edge simulation technology and measurement methods, Vibratec has accumulated an extensive experience working to the benefit of the world leading manufacturers and most significant projects.

Don’t hesitate to vist us at Innotrans, Hall 3-2, stand 301 C6 to see how we can help you.


Get your school year off to a good start – with some professional training !

The aim of our training courses is to disseminate our knowledge and understanding of industrial vibration, acoustics, signal processing and related fields to our course delegates.

  • The 11th of September will be the occasion to learn about standards and requirements regarding “Personnel Vibration Exposure” to negotiate with suppliers more effectively, improve worker / colleague protection and fully comply with applicable legislation.
  • The 12th & 13th, our “Experimental Vibration Analysis” course will present the main causes of vibration problems in industry, an overview of various measurement techniques and notions of how to mitigate problems.

2 programs dedicated to the Oil & Gas industry will finish the month:

  • The 12th and 13th will be dedicated to “Noise Control in the Oil & Gas Industry”, presenting basic acoustics, methodology to handle project specifications and identify noise sources and an overview of different computation and measurement methods, as well as the strategic importance of managing installation noise control.
  • The 14th and 15th will address “Vibration Control in the Oil & Gas Industry”: vibration phenomena, the technical support that computation and measurements can provide, efficient technical approaches to prevent and/or solve vibration problems.

continued education

ASME Pressure Vessels and Piping (PVP2018) Conference – VibraTec to publish our technical developments

VibraTec will publish 3 papers at the PVP Conference in Prague next month. The articles will present an innovative method to model fluid-structure interaction in industrial piping, and also non-intrusive diagnosis.

Heavy fluid flow within industrial piping interacts with structure walls, applying an asymmetric, unsteady load. Vibrations provoked by this flow are an important phenomenon that is hard to model accurately. VibraTec is proud to present our innovative findings; a new simplified approach to modelling turbulent sources. Our progress in non-intrusive characterization of fluid loads will also be published.

Rémi SALANON and André BARAMILI will be on hand on the 17th and 18th of July to discuss your piping issues and answer questions.

More information available on the conference website.

piping excitation model

Bayesian focalisation applied to wind tunnels – AIAA/CEAS conference Atlanta

Between 25th and 29th June 2018 will be held the 24th AIAA/CEAS Aeroacoustics Conference in Atlanta.

It is certainly one of the most famous scientific conferences in the field of flow induced acoustics. MicrodB is proudly contributing to a research paper, together with Ecole Centrale de Lyon, University of Sherbrooke and Safran Aircraft Engines. The work, entitled ‘Broadband Airfoil-Noise Source Localization by Microphone Arrays and Modeling of a Swept Free-Tip Blade’ will be presented by Gyuzel Yakhina.

It is the occasion to apply advanced microphone array techniques in complex wind tunnel configurations.


ISNVH Congress in Graz Austria: June 20th – 22nd, 2018

VibraTec will attend the 10th ISNVH Congress in Graz Austria, June 20-22. Jean-Luc Wojtowicki will be on stage to present two papers on our core expertise:

  • The characterization and simulation using super element of structure borne noise sources and transfer paths in partnership with Renault and Valeo
  • The optimization of the noise of e-machines and their supply (PWM)

Henri Saucy will be in the room to encourage him and to gather your comments and questions.

Eager to see you there.


Customized asset management and monitoring solutions: learn about at Achema, from 11th to 15th of June 2018

Surveillance or maintenance: ignorance is bliss?

Do not stay in the dark! Have better nights: discover our Smart Solutions to plan your maintenance and ensure the quality of your activity.

To find out more, come see us at the ACHEMA trade show in Frankfurt, 11th to 15th of June 2018, hall 11.0 booth A58. We will answer your questions, especially in the production, process and energy industries.

If you want free invitation, contact us.


2018 Vibratec China Activities

Started off with the NVH symposium held in Suzhou on 10 &11th May. Vibratec Head of Automotive Department Pascal Bouvet was invited by the SAE-China NVH Committee to deliver a speech at the NVH symposium. The events allow us to meet and discuss in group around the topics about vehicle NVH control technology. Hereby, we would like to extend our heartfelt gratitude to the SEA-China NVH Committee for the invitation to speak for such a large scale event.

Alongside with our Chinese partner Yiduo Technologies, we organised and delivered a training on E-noise and Gearbox noise in Shanghai from 14-16th May. It was very encouraging to see more than 50 attendees from major automotive players in China. Thank you Yiduo Technologies for your support in hosting the training and made it a huge success.

Stay tuned for upcoming events !


Piping Vibration Training Kuala Lumpur on 16th Jul 2018


This 1-day intensive course focuses on the theoretical and practical aspects of piping vibration.  We will present the theoretic foundations that provoke these phenomena and the analysis & control methods that address them. Case studies and on-site examples from Vibratec’s experience will illustrate the presentations.

Who should attend:

  • Specialist engineers (HSE, mechanical, structural, piping)
  • Operation support (maintenance, technology, operation)
  • Contractors 
  • Project team
  • Asset management consultancy

Related industries for the course:

  • Oil & Gas
  • Petrochemical
  • Chemical
  • Energy (gas, coal, nuclear power plants)

Event details:

  • Venue: Aloft Hotel, Kuala Lumpur
  • Date: 16th Jul 2018 (Monday)
  • Time: 9am to 5pm (registration starts at 8:30)
  • Networking lunch provided
  • Fee: RM 500 nett (HRDF claimable)
    Early bird discount: RM 50 (register and pay before 15th Jun 2018)
    Group discount: RM 50 (3 or more delegates)

This course is eligible for HRDF claims under the SBL Scheme, subject to prior application to HRDF grant by the HRDF registered employers! If you need further information and details to process the claim, please feel free to contact Mrs Teoh Chew Chin, E-mail: chew-chin.teoh@vibratec.my, Tel: +603 2303 1786


Optische Kontrolle Rohrleitung

VibraTec at the ENOVA Toulouse event on the 30th and 31st of May 2018

Come and meet us on booth B10 and discuss your needs for optimizing the design of your equipment in noise, vibration, and reliability. We will also present innovative instrumentation solutions, embedded or not, for the diagnosis and control of the life cycle of your products. Among the presented solutions: the SoundCam solution developed by our subsidiary MicrodB to perform a rapid acoustic diagnosis of a complex mechanical system; and an original solution for diagnosing the components of a transmission chain.


Vibratec awarded by the CLEANSKY 2 to develop an instrumented engine cradle for the turboprop demonstrator ground test with SAFRAN Helicopters Engines

In the framework of the development of a new turboprop engine demonstrator (ENGine ITD JTP CLEANSKY 2) for the 1800-2000 thermal hp class, a full Integrated Power plant System (IPPS) will be ground tested. Derived from the ARDIDEN 3 Turboshaft engine, the engine will be equipped with new propeller and power gear box including air intake and nacelle.

VibraTec will be in charge to design, to manufacture and to qualify an instrumented engine cradle with two major objectives: the monitoring of the engine loads in operational conditions and the reduction of the vibration path to optimize the crew and passenger comfort.


LUG2 project at NOVEM 2018

MicrodB, INSA Lyon and CNRS will present a paper entitled « SENSITIVITY ANALYSIS OF ACOUSTIC INVERSE PROBLEMS » at NOVEM 2018 Ibiza from 7th to the 9th May

The characterisation of an acoustic source is achieved by retro-propagating the acoustic field measured with a microphone array to a mesh of the surface of interest. This latter step is performed by solving an inverse problem. Such inverse problems are built on the basis of a forward model prone to uncertainties arising from the physics of the experiment.

Assessing the effects of these uncertainties on the resolution of the inverse problem represents a challenge. This paper introduces a practical solution to measure these effects by conducting a sensitivity analysis. The sensitivity analysis method applied here provides a mean to identify and rank the main sources of uncertainty through the estimation of sensitivity indices. Two inverse methods are investigated for the reconstruction of a monopole source: Beamforming and Bayesian focusing. The propagation of uncertainties is carried on numerically. The consistency between the real experiment and its numerical approximation is assessed by means of a small batch of measurements performed in a semi-anechoic chamber.


Ignorance is bliss ?

Why would you monitor your production line, when it’s so much simpler to just wait for it to break down and bring your entire activity to a full stop?

If “Ignorance is bliss” isn’t your motto, if you sleep better with your maintenance well-scheduled and a rigorous quality control, you may be interested by our Smart Solutions.

Combining multi-physics sensing with state of the art modelling and Digital Twin technology, VibraTec offers customized asset management and monitoring solutions independent of any specific hardware or software.

To learn more, come and see us at ACHEMA in Frankfurt, Germany, from 11th to 15th of June 2018, hall 11.0 booth A58, where we can introduce you to our experience with the manufacturing, process, and energy industry.


Managing MEMs microphone calibration – MicrodB will share its findings at the 14th French Acoustic Congress in Le Havre from April 23rd to 27th.

VibraTec will be represented by MicrodB at the French Acoustic Congress in Le Havre to present its work on local MEMs microphone calibration and the integration of an associated filter to correct its response.

The democratization of information technologies and communication (ICTS) offers new possibilities for acoustic metrology, and more specifically methods implicating a large number of microphones. Digital MEMs sensors and embedded ARM FPGA processors provide a new solution for these situations, increasing performance while reducing implementation costs.

However, the integration of these technologies, which are not intended for metrology, requires rigorous calibration to identify and correct the intrinsic frequency response of the MEMs welded on an electronic board (PCB).

Array calibration

Comprehensive innovative monitoring solutions to be presented at ACHEMA

Looking for a comprehensive, innovative solution to monitor your production process or characterize your products and raw materials?

VibraTec will participate in the ACHEMA trade show in Frankfurt from June 11th to 15th. We will present our SmartSolutions applied to a variety of industries and processes: energy, transportation, pumps, medical devices, test benches, safety and quality control.

Come and visit us to see how we can help you boost productivity and manage your assets the smart way!

Henri, Nicolas, and Katja will be waiting for you at booth A58, Hall 11.0.


Innovate with VibraTec ! We will be at the Smart Industries event during the Global Industrie fair in Paris from 27 to 30 March

VibraTec was chosen to represent the Auvergne-Rhone-Alpes region as an SME with innovative products & services (predictive maintenance, innovative sensors, digital twins, etc).

Agnès Gerphagnon and Lucille Lamotte will present the group’s latest innovations, including the LMS SoundCamera developed by MicrodB and our predictive maintenance SmartSolutions connected, autonomous sensors.

The Global Industrie fair focuses on the Industry of the Future and brings together stakeholders from the entire manufacturing ecosystem and all industry sectors. It is backed by President Macron, the French government and the Industry of the Future Alliance (AIF). From March 27th to the 30th, almost 3 thousand exhibitors will welcome over 50 thousand visitors.

connected sensors

The JASA (Journal of the Acoustical Society of America) chooses MicrodB as the latest Technical Area Pick in Signal Processing

The article, entitled “Instantaneous Bayesian regularization applied to real-time near-field acoustic holography”, was published on August 16th 2017. It has been chosen among all articles related to signal processing published throughout 2017.

MicrodB’s technological developments make it possible to reconstruct non-stationary acoustic sources (closing doors, rotating sources, transitory phenomena) using acoustic imagery.

The main scientific development is to have solved the inverse problem by using a Bayesian approach that significantly increases the method’s stability. The method is also enhanced to allow the reconstruction of long signals.

We are proud to see that Thibaut LE MAGUERESSE’s PhD thesis, fully integrated in the VibraTec group’s R&D program, has achieved such professional recognition.


VibraTec participates at JAAN on the 26th and 27th of October 2017 in Toulon

VibraTec contribution to JAAN 2017 (Ollioules, France, 26th and 27th of October 2017): « Acoustic transparency of Alberich coatings under high water pressure: coupled simulation methodology »

VibraTec will present a coupled simulation methodology for the estimation of the acoustic transparency (as well as reflection) of rubber coatings with periodic air inclusions (as Alberich coatings) under high water pressure. These panels are made for being implemented on underwater structures. Many challenges must be addressed: the large strain of the coating under static water pressure, the highly non-linear behavior of the hyperviscolastic material, the influence of the static deformation on the acoustic behavior. The possibilities offered by this method are of utmost interest: optimizing the design of the coating and the properties of the material to improve the acoustic performance of the coating under given pressure and temperature conditions.


Why wait to schedule your 2018 training programs ?

Referenced as an official training center and registered on the DataDock platform to enable public funding for our course attendees (from French companies), VibraTec offers courses centered around industrial vibration, acoustics, signal processing and related fields targeting engineers and technicians.

The 2018 catalogue gives the schedule for our Open programs given in France.

We also organize all of our courses on demand on-site for clients worldwide who wish to train groups of employees together, focusing on their specific field / job.

Feel free to contact our training department for more information.


VibraTec will be at SERMA’s Technology Days on September 21st and 22nd near Bordeaux

VibraTec and Serma will present the fruit of their collaboration regarding the reliability of mechatronic equipment. Very different, electronic and mechanical reliability are rarely studied together. The work carried out by VibraTec and Serma aimed to couple the two approaches in order to produce reliable mechatronic equipment. The resistance/stress reliability approach and specific mechatronic applications will be presented.


VibraTec’s training programs referenced by DataDock

VibraTec has been referenced as an official French training center for many years: we are now also registered on the DataDock platform, which centralizes information concerning French training centers to facilitate funding by “OPCA” (accredited fund-collecting / funding agencies), associations in charge of funding professional training throughout workers’ careers.

Yet another sign of VibraTec’s commitment to quality in all aspects of our activity.


We will be at the 8th VDI conference on wind turbine vibration in Bremen/Germany on June 27th-28th, 2017

VibraTec will be at the 8th VDI conference on wind turbine vibration in Bremen on June 27th-28th, 2017. We will present our expertise on experimental and numerical vibratory diagnosis techniques in this context.

 After a wind turbine was retrofitted with a new generator, much higher noise levels recorded at the foot of the tower raised concerns about its reliability. VibraTec was called to perform a thorough on-site diagnosis to determine the origin of the noise and assess the risks on the fatigue behavior of the structure. To take all possible vibration sources into account, a multi-physics approach was applied, covering electromagnetic excitation, torque pulsation, cogging torque, unbalance and bearing condition. Advanced experimental techniques such as simultaneous recording of sound pressure, current signals and accelerations were applied to assess the vibrational behavior of the wind turbine.

The results of the diagnosis gave conclusive arguments on the safety of the operation in the new conditions.



Presentation of a publication at Surveillance 9 Conference in Fes, Morocco, May 22nd to 24th, 2017

The noise from “Root” type vacuum pumps is a major disadvantage to wider use. The noise sources and the mechanisms involved in these pumps are complex, strongly coupled and their modeling is delicate (3D fluid calculations in a cavity of changing geometry, coupled with a nonlinear meshing dynamic).

The collaborative project FUI ARPE (Acoustics and vibration of vacuum pumps) aims to significantly improve the multi-physical modeling of these pumps. In this context, a measurement campaign was set up, on the one hand, to recalibrate the models and, on the other hand, to establish a vibro-acoustic diagnosis of the pumps.

VibraTec will be at the Surveillance 9 Conference in Fes, Morocco, from May 22nd to 24th May, 2017, to present the measurements performed and their uses (shock detection, psycho acoustic criteria, etc.)

ShareLab - invite yourself to VibraTec !

VibraTec welcomes you to our lab and gives you free access to our sensors, data acquisition systems and facilities.