NVH performance characterization of MHEV, PHEV and BEV ...
E-powertrain design to reach performance and NVH target...
VibraTec – working from home...
Clean Sky’s CANOBLE – New architecture, new...
Gain computation time with VibraTec’s digital planeta...
E-powertrain training program – increasing understand...
Trainee satisfaction in 2019...
TRANSIT – Railway noise R&D for cost-effective v...
Why wait to schedule your 2020 training programs?...
Extend asset service life thanks to VibraTec’s expert...
Quality control is of utmost importance to industrialis...
Converting data into information to improve structural ...
Experimental validation of numeric planetary gear set b...
Bearing and gear fault detection using Machine Learning...
There are no passengers on spaceship earth....
Jessica Neufond will represent VibraTec in Le Mans on 1...
September 2018 International Railway Conference : ̵...
Dealing with gear noise of real industrial systems: an ...
Innovate with VibraTec ! We will be at the Smart Indust...
The JASA (Journal of the Acoustical Society of America)...
Small company or multinational ? Come talk to VibraTec ...
The VibraTec Group – actively involved in training to...
VibraTec – preparing students for the real world...
VibraTec E-Noise Training in Shanghai China...
Why wait to schedule your 2018 training programs ?...
VibraTec’s training programs referenced by DataDo...
NVH performance characterization of MHEV, PHEV and BEV cars
CO2 regulations for cars are forcing manufacturers to develop electric cars. In this booming market, high-value NVH data is needed to implement competitive technical strategies. Thanks to its test facilities and know-how, VibraTec carries out comparative electric vehicles studies, from the characterisation of their components (motor, gearbox, etc.) to transfer path analysis (TPA) of the powertrain as a whole, including rolling noise contribution analysis.
We offer full characterization of vehicle or component NVH performances following client best practice needs / requirements:
- Compliance with OEM internal procedures,
- Reliable results based on large experience in NVH.
Today, VibraTec has characterized the following models:
- Hyundai KONA : BEV with 1 E-Powertrain at the front
- Golf GTE : PHEV with 1 Electric motor (P2)
- Jaguar I Pace : BEV with 2 E-Powertrains (4WD)
- Tesla Model X : BEV with 2 E-Powertrains (4WD)
- Volvo XC90 TE: PHEV with 1 ICE at the front and 1 E-Powertrain on rear axle.
Which new model are you interested in?
E-powertrain design to reach performance and NVH targets
Often, the first E-powertrain prototype does not correspond to NVH specifications. At this stage, there is little time for re-design, and only slight modifications are possible to address NVH requirements without performance loss.
VibraTec has developed a multiphysics optimization algorithm that takes client targets and constraints into account. The algorithm optimizes several parameters, virtually guaranteeing that NVH specifications will be respected.
With a unique combination of gear and electric motor optimization, VibraTec’s algorithm reduces acoustic power levels at critical operating points by at least 5 dB, and up to 20 dB in certain cases. NVH specifications are fulfilled, performance and manufacturing processes are maintained and no acoustic treatment is required.
More information, training programs and expert consultation here.
VibraTec – working from home
All employees, whether they have administrative, commercial or technical functions, have the equipment and access to work from home and ensure business continuity. They are at your disposal to deal with your questions. Thank you for your understanding.
Clean Sky’s CANOBLE – New architecture, new cockpit… new noise experience
Cockpit and cabin noise is of primary importance in the design of new aircraft. Cabin noise is a source of discomfort, whereas cockpit noise is a source of risk for pilots resulting in communication difficulties and fatigue.
Mastering the excitation, transmission path and noise radiation that create cabin noise is a key challenge to design the next generation of aircraft. The CANOBLE project (CAbin NOise from Boundary Layer Excitation) developed and validated innovative engineering methods and tools up to TRL5 for the design phase study of noise generated inside the cockpit and cabin by the external turbulent boundary layer.
The project began by developing new technologies: MEMs digital microphones array for the measurement of the wall pressure surface excitation and a numerical workflow to predict the interior noise, combining RANS CFD data, empirical models and vibroacoustic FEM solvers. These technologies were then validated in a dedicated academic wind tunnel.
In parallel, a full-scale mockup was designed and manufactured. Various structural components of interest were instrumented. A dedicated interior cavity welcomed interior acoustic measurements, including intensity probes and a 3D acoustic array to quantify the radiated power and to identify the most emissive structure-borne path. Wind tunnel testing was conducted covering a large range of configurations for various flow conditions. The last part of the program focused on exploitation with the setup of the full scale test data base, the development and the validation of virtual prototypes.
The CANOBLE project is a major breakthrough towards the state-of-the-art, offering new engineering methods including both prediction and test solutions, to address interior noise. Validated on a full scale aircraft mockup, the CANOBLE technologies also open new fields of investigation for other industries, such as automotive and railway transportation.
Watch our video presenting the entire project.
Read more on European R&D program Clean Sky’s website.
- Leneveu R., Salze E., 2020, Cabin noise from boundary layer excitation : full-scale wall pressure measurement and vibroacoustics transmission, Aerospace Europe Conference, Bordeaux, France
- Paper will be presented on Wednesday 26th February 2020 at 3:20PM (Session 31) at the next Aerospace Europe Conference in Bordeaux, France
Gain computation time with VibraTec’s digital planetary gear model
This dynamic model of a complete planetary gear train, from the characterization of internal excitation to the vibratory state of the system at a stabilized regime, makes it possible to take account of the flexibility of the various components (shaft, bearing, wheel body, etc) with very short computation times. VibraTec’s know-how in digital model validation with real-life testing is highlighted; transmission error and housing vibrations were measured on two planetary gears with differing tooth profiles.
Static input/output transmission errors measured on planetary gears will be presented, accompanied by the housing’s vibration levels for various running regimes. These results are compared to digital model predictions developed during Jessica Neufond’s doctoral thesis .
The dynamic model has several advantages compared to those from literature: a complete 3-dimensional finite element model, an iterative spectral method reducing computation time to a minute per stationary regime, inclusion of coupled and simultaneous interactions between contact conditions for each meshing with a micro-geometric description of the gearing, and finally, validation by computation/measurement comparison.
These results, achieved through collaboration in the Ladage (VibraTec and the LTDS, Ecole Centrale de Lyon), will be presented on February 17th 2020 at the upcoming Euro-Mediterranean Conference on Structural Dynamics & Vibroacoustics in Naples.
Contact us for more information. J.Neufond, E. Denimal, E. Rigaud, J.Perret-Liaudet, A.Carbonelli, Whining noise computation of a planetary gear set induced by the multi-mesh excitations. Proc. Inst. Mech. Eng. C, 2019
E-powertrain training program – increasing understanding of electric vehicles
Technology is continuously evolving: VibraTec aims to remain a pertinent partner for your technical training.
This is why we have created the “Vehicle E-powertrain Integration” training session. Two days to understand E-powertrain dynamic behavior, NVH specificities & learn how to build and interpret NVH specifications and lead E-powertrain integration projects.
Our sessions will make it possible to have a better grasp on the impact of E-powertrains on vehicle accoustics, and enable trainees to combine their basic knowledge of structural acoustic radiation, structural dynamics and automotive design in order to successfully integrate E-powertrains in vehicles.
📌 The first session is scheduled on 26-27 May: registration is open !
Trainee satisfaction in 2019
At VibraTec, our clients’ opinions are important for the evolution of our diverse activities, to guarantee that we stay in touch with client needs.
Our 106 external trainees gave us a score of 8.8/10 for our 2019 training programs. The score reached 9/10 for all 152 people trained throughout the year.
What was appreciated? Our dynamic staff, attentive to specific needs and able to meet them, adapting as required.
What should be improved? The duration of our programs.
Our 2020 sessions will take this into account, aiming to increase trainee satisfaction without sacrificing key program content.
Many thanks to our training team, whose work has been recognized and appreciated. We also thank all those who trust us for their training, and whom we hope to see again in 2020.
TRANSIT – Railway noise R&D for cost-effective vehicle certification
VibraTec and MicrodB are active players in railway research: within the Shift2Rail project TRANSIT, we are working on noise source characterization and separation in order to develop new and more efficient techniques for the railway industry and vehicle certification.
Our contribution aims to improve modelling approaches for the integration of noise sources such as compressors, HVAC and traction systems on the vehicle. We combine numerical simulations with our in-house tool SONOR and MicrodB’s well-proven acoustic arrays and imaging techniques.
TRANSIT was launched last December; we are looking forward to cooperating with our partners from leading European universities and companies.
Why wait to schedule your 2020 training programs?
NEW this year! Vehicle E-Powertrain Integration. Two days to understand E-powertrain NVH specificities and lead an E-powertrain integration project.
The first sessions in 2020 are in January: three topics will be addressed:
- Vibration Control in the Oil & Gas Industry on the 15th and 16th,
- Railway Acoustics & Vibration from the 21st to 23rd,
- Finite Element Model Updating on the 29th and 30th.
Specific web pages give the schedule for our Open programs given at our Headquarters 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.
Referenced as an official training center since 1989 and registered on the French “DataDock”, VibraTec offers courses centered on industrial vibration, acoustics, reliability, signal processing and related fields targeting engineers and technicians.
Feel free to contact our training department for more information.
Extend asset service life thanks to VibraTec’s expertise in fatigue analysis and approach to evaluate remaining life
Remaining life provides visibility of the structure’s future life to anticipate difficulties and guarantee long-term quality of service. Analysis of this parameter is an important part of asset management for structures designed to last for decades, like railway transportation networks.
In this specific case, the method quantitatively assesses the remaining life of railway network car bodies. Operation and maintenance road maps serve as guides to reach service life objectives.
Structural modification can also be evaluated to optimize life duration, providing support for investment teams, helping them optimize their asset management strategy.
Quality control is of utmost importance to industrialists
VibraTec is able to assist clients with completely adapted and bespoke solutions.
VibraTec and Aptiv recently worked together to develop a contact force test rig to validate product quality on the production line.
And it’s a success !
Converting data into information to improve structural diagnosis
A step back on how to best use the wide variety of Machine Learning tools and data processing in predictive maintenance applications.
The aim is to present a flexible methodology that can be generalized to predictive maintenance problems. How to adapt raw signal pre-processing according to objectives ?
The outcome of this work comes from the diverse projects carried out at VibraTec. With the current massive development of these technologies, it is important to select and master those that are most appropriate.
“Science without conscience is but the ruin of the soul”. Anyone can use Machine Learning; it is important to understand its potential and limitations to do so properly.
International conference on gears 2019 (VDI Munich)
Contact: Alexandre Carbonelli
Experimental validation of numeric planetary gear set behavior
The numerical model developed during Jessica NEUFOND’s thesis on the dynamic behavior of planetary gears has been validated by a campaign measuring a variety of planetary gears presenting a large number of tooth profile modifications. From the characterization of static transmission error to the vibratory state of the housing, the experimental data were compared to the numerical results from a dynamic model, validating the developed model.
Contact us for more information.
Bearing and gear fault detection using Machine Learning
Maintenance services are beginning to use conditioned-based maintenance with vibration sensors. New methods in signal post-processing are being coupled with Machine Learning (ML) algorithms.
The method proposed by VibraTec is to add a qualitative analysis in case of fault detection (bearing or gear faults, etc.)
This new step helps maintenance services to focus more efficiently on the faulty part of the system, inducing more rapid repair. This involves less downtime, leading to significant gains in productivity.
This research work was developed for maintenance services, in order to increase the efficiency, maintenance scheduling, and organization.
The work, focusing on the railway sector, was developed in the scope of the Run2Rail project (Shift2Rail). However, it can be applied to any industrial sector (aeronautics, automotive, etc.).
There are no passengers on spaceship earth.
The VibraTec Group guides its clients toward eco-friendly solutions whenever possible, and also encourages the use of public transportation, cycling and carpooling among its employees.
In this context, AirFrance’s CO2Zero program supporting CO2OL provided us a good way to compensate our air travel carbon footprint by helping to reforest the Panama Canal Zone. To date, over 7.5 million trees have been planted, 15 endangered species have a new habitat and 150 jobs have been created.
Jessica Neufond will represent VibraTec in Le Mans on 15-16 Nov at the Young Researchers’ Days in vibrations, Acoustics and Noise
She will present results of a study of the vibroacoustic behavior of planetary gears, from the determination of internal excitation to the vibration state of the housing.
The method developed reduces computation time (under an hour for a complete simulation) while using the real gearbox geometry.
This study focuses on planetary gear whining noise by determining internal excitation by simultaneously taking into account all meshings to include coupled interactions. The dynamic response is then calculated at any point in the housing via the resolution of the coupled equations of motion in the spectral domain and via an iterative process. Finally, experimental testing was performed to compare calculation and measurement results.
This is the subject of Jessica’s CIFRE thesis, in partnership with the Laboratory of Tribology and Systems Dynamics (LTDS, Ecole Centrale de Lyon) resulting from the common Ladage laboratory. VibraTec‘s expertise on the topic of gears is thus extended to the case of planetary gears.
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.
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.
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.
Small company or multinational ? Come talk to VibraTec personnel at the INSA’s Professions Day on January 31st
VibraTec is a regular participant at this annual event organized by the INSA Lyon’s Mechanical Engineering Dept.
Four VibraTec experts will be participating this year :
- Hervé GOUTAGNY, Project Manager, will share his career experience;
- Emmanuel REYNAUD, Sales & Project Manager, will compare work in an SME and work in a multinational ;
- Cyril GAUMAIN, Head of Department, will explain how R&D is integrated in SMEs ;
- Fanny QUERVILLE will be at our stand to present current openings (internships & jobs) and review student resumés.
The VibraTec Group – actively involved in training tomorrow’s technicians and engineers
“Our continuous presence at the heart of higher education creates connections with our future clients and partners.” Christian Clerc, Scientific Director.
A few employees are on Engineering & Master’s program steering committees. Some complete Engineering school’s theory classes with concrete applications implicating state-of-the-art technology.
Others teach in technical schools throughout their 2- or 3-year programs. In this context, VibraTec opened its lab to a class of 1st-year students from the IUT in St Etienne on December 14th. The students shared the daily life of technicians and talked with alums who now work at VibraTec.
These diverse contacts with the reality of industrial life are an important element of each one’s career choices.
VibraTec – preparing students for the real world
This year as usual, VibraTec visited the IUT of Saint Etienne’s Applied Physics Department, helping to bridge the gap between academic theory and the reality of the working world.
VibraTec offers students the possibility to discover various examples of what a vibration – acoustics techician’s job is: concrete case studies, measurement methods & material, professional profiles, the pertinence of knowing English, etc. This helps clarify student orientation – and gives some the desire to work at VibraTec during their training and/or afterwards !
A group of students will also visit our headquarters in December to discover our lab and exchange with our teams on their day-to-day lives.
VibraTec E-Noise Training in Shanghai China
VibraTec, through its partner YiDuo is organizing its very first customized E-Noise training in China comprising a 3-day session on “Noise from Electromagnetic Origin” to be delivered in Shanghai from 25th – 27th September 2017. This training targets management, engineers and technicians working in the field of design and application of electric machines or vibroacoustics. The intended program will cover the following topics:
- Day 1: Electrical machines (architecture, operating principle and control) with their associated power converter and control strategies;
- Day 2: Noise from electrical machines and power converters (magnetic excitations, vibrational behavior, radiated noise, important parameters);
- Day 3: Examples and questions / answers.
Practical cases including illustrations from VibraTec’s own Research & Development projects in the automotive field (powertrain, power converters and electric motor) are also part of the itinerary.
The training will be delivered by one of VibraTec’s E-Noise specialists, Sylvestre LECURU.
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’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.
covid19 - VibraTec is working from home
All employees are telecommuting in order to ensure business continuity.