1. technology and computing

8th International Styrian Noise,
Vibration & Harshness Congress
The European Automotive Noise Conference
in
cooperation
with
July 2-4, 2014 Graz / Austria www.isnvh.com
Retrospect
on the 2014 edition of Europe‘s
leading Automotive Noise Conference
The 8th ISNVH 2014 Retrospect:
ganized by the VIRTUAL VEHICLE Research Center in Graz,
NVH solutions for energy-efficient
lightweight vehicles
in cooperation with AVL List GmbH, Magna Steyr Fahrzeugtechnik AG & Co KG, ACstyria Autocluster GmbH and SFG
- Styrian Business Promotion GmbH and in cooperation
with the Society of Automotive Engineering International
For the achievement of further energy efficiency automo-
(SAE).
tive industry chiefly relies on lightweight design and alternative propulsion systems, resulting in dramatically chan-
At the Technical University of Graz, research in the field
ging vehicle concepts and architectures. This new scenario
of vibration and noise began in 1999 with the creation of
poses overwhelming challenges for the NVH engineers,
the Acoustic Competence Center (ACC), which was headed
who are suddenly expected to reach the same levels of
by Professor Josef Affenzeller and Professor Hans-Herwig
comfort and brand sound signature as previously obtained
Priebsch. Without the tireless efforts of ACC, the ISNVH
with conventional vehicle structures.
Congress could not have become the renowned meeting
place for experts from around the world that it currently
This complex task is hampered by the fact that the state-
is. Although the ACC changed its name to Area C “NVH &
of-the-art tools only partially fulfill the needs with regard
Friction” when it merged with the “Virtual Vehicle” in 2008,
to the efficient modelling and reliable simulation of vehicle
the organization continues to build on the solid foundation
structures made of a mix of lightweight metal alloys and
formed by these early efforts.
composites. The numerical optimisation of lightweight vehicles with alternative propulsion systems in the acoustical
In the following pages, we offer a brief overview of the
frequency range is consequently still a challenge.
results of the 8th ISNVH Congress that was held in July
2014. And moreover, we extend a hearty invitation for the
The 8th ISNVH conference brought together around 200
9th ISNVH Congress, which will take place in Graz on 22-24
international engineers and specialists from industry, re-
June 2016!
search centers and universities to discuss the latest technological innovations and recent achievements in vehicle
NVH. The bi-annual ISNVH Congress in Graz is now one
of Europe‘s leading events in the field of vehicle acoustics
and vibration, where experts from industry, research and
universities present their latest findings. The ISNVH is or-
Jost Bernasch
Managing Director
Virtual Vehicle
:
E
DAT
THE
E
V
SA
Anton Fuchs
Area Head
NVH & Friction
Virtual Vehicle
Hans H. Priebsch
Scientific Consultant
NVH & Friction
Virtual Vehicle
Eugenius Nijman
Scientific Head
NVH & Friction
Virtual Vehicle
9th International Styrian Noise,
Vibration & Harshness Congress
The European Automotive Noise Conference
in
cooperation
with
June 22-24, 2016 Graz / Austria www.isnvh.com
to their wide variety of topics and excellent moderators
and speakers. Exhibitors including AVL List GmbH, Magna Steyr, Microflown Technologies, Brüel & Kjaer, Head
Acoustics, FFT, ESI, and Siemens Industry Software presented various technical products and software from the
world of NVH. They found an excellent environment for
sharing their ideas with their customers, as the conference
offered an ideal platform for networking and discussions
with speakers and participants from leading NVH centers
around the world.
Keynote lectures
Dr. Mihiar Ayoubi of BMW Group, Germany discussed
challenges of virtual prototyping for premium NVH comfort. He gave an insight into current NVH engineering prac“Virtual prototyping of NVH causal loops is a critical
success factor for NVH engineering along the product
development process. NVH Engineering is at the forefront
of customer awareness and a key-factor for automotive
brand specific positioning and differentiation.“
tices to meet premium automotive customer awareness
Dr. Mihiar Ayoubi
derstand physical phenomena and to cover them by an
BMW Group Germany
and perception. Together with design and ride & handling
NVH comfort ranks in the Top 3 vehicle characteristics for
customers.
The base for a successful NVH development is to fully unestablished operational virtual prototyping process across
the vehicle development cycles. The second key factor is a
Exciting sessions and workshops
continuous frontloading of the virtual methods specifically
The discussion forums featured in the professional ses-
prototyping applications were shown for engine, wind and
sions and workshops offered substantial time for the ex-
chassis NVH development.
in the architure phase of the development. Practical NVH
change of ideas and networking. The sessions and workshops were complemented by the technical exhibitions,
Toyota Motor Corporation made waves with an intensive
which presented the latest simulations and experimental
fuel cell strategy and production-ready fuel cell vehicle.
technologies.
The participants were highly interested in the session topics, which comprised Downsizing, Cylinder cut-off and
NVH, Interior Noise and TPA, Flow Induced Interior Noise
(Wind Noise) as well as NVH of TC and Gas Exchange Systems and Vehicle Comfort. Additional session topics included NVH and Hybrid/Electric Drives, Pass-by and Exterior
Noise Measurement/Simulation/Reduction, Sound Absorption and Insulation and Powertrain Noise and Friction.
In addition to the traditional technical presentations covering the most important current topics, the workshops
proved very successful as a platform for discussions about
specific technical and scientific issues, which included:
• Lightweight design & NVH
• Friction and NVH: impact under various conditions
and its linkage to noise and energy dissipation
• Challenges automotive fluid-structure-acoustics
interaction
• Simulation of engine acoustics
The sessions and workshops were well attended, due
NEW
on a mix of technologies, i.e. hybrid vehicles. Yoshioka
also presented insights into Toyota’s simulation methods
used in the design of its vehicle models with respect to
noise and vibration.
Prof. Jean-Louis Guyader presented the time reversal
technique. Time reversal is based on the symmetry pro-
“Toyota will continue to develop next generation ecocars such as electric vehicles, plug in hybrid vehicles
and fuel cell vehicles (FCV), emphasizing hybrid
vehicles as fundamental core technology.
Sedan
type FCV will be launched in 2015 in limited areas in
Japan, North America, and Europe, where the hydrogen
infrastructure is expected to be readied.“
Takayoshi Yoshioka
Toyota, Japan
Mr. Takayoshi Yoshioka presented the company strategy with respect to “Eco Cars” and showed that the company is planning to continue the parallel development of
electric and hybrid vehicles on the one hand, and fuel cell
vehicles on the other, whereby the strategic focus is placed
“The Time Reversal Antenna is a new experimental
approach to localize a vibratory source of unknown
origin in a structure. It takes advantage of structure
complexity and does not require dedicated test rooms.
Vehicle application have to be experienced.“
Prof. Jean-Louis Guyader
INSA Lyon, France
perty of the linear wave equations which are insensitive
to the direction in which time evolves meaning that when
time is reversed waves travel back to the source. Although
in media with losses the symmetry property of the wave
equation is no longer valid the time reversal process still
holds but with decreased efficiency.
There is consequently a potential to use this time reversal
principle for acoustical source localization and transfer path
analysis purposes in automotive systems. The proposed
methodology consist of two steps. In the first step, referred to as forward propagation, the signals coming from an
unknown source are recorded with transducers distributed
over the system. During the second step, referred to as
time reversal, the recorded signals are time-reversed and
re-broadcasted into the structure. The wave fields propagate in the reverse direction “backwards in time” along the
same paths traversed during the forward propagation and
retro-focus on the positions of the sources. Focalisation is
already achieved with a reduced number of transducers
especially when the investigated structures are complex
since the multiple reflections carry detailed information
about the structure. Some interesting real-life applications
were presented.
“To model the vibro-acoustic response of light
sandwich structured composite materials, specific
hybrid simulation methodes are required. Appropriate
models consider different wave length in subsystems
and combine Finite Element and Transfer Matrix
methodologies.“
Prof. Noureddine Atalla
Université de Sherbrooke, Canada
Prof. Noureddine Atalla from the University of Sherbroo-
on and vibration behaviour of composite components used
ke in Québec, Canada presented possibilities showing how
in passenger cars needs to be specifically optimised, since
very lightweight sandwich composite materials can also
lightweight materials are often difficult to design based on
be optimally designed with respect to noise insulation and
NVH attributes. Atalla showed methods for the early eva-
vibration in passenger cars. Composite components are al-
luation of the vibration characteristics of these materials in
ready widely used in aviation. However, the noise insulati-
order to determine their optimal area of application.
tion. He demonstrated that on the one hand, as a result
of the new legislation, the dominant factor affecting total
noise at low vehicle speeds is no longer the engine, but
the tyres. On the other hand, the tyre rolling noise caused
by today’s tyres is considered to have been largely optimised, so much so that the remaining significant factors that
would lead to further noise reduction now lie outside of the
tyre manufacturer’s sphere of influence. These factors are
above all varying asphalt characteristics and too low tyre
pressure caused by lack of maintenance. Despite the fact
that the perfect tyre profile with an optimal compromise
of all factors has not been found, it would seem that the
future tyre will be both high and narrow, similar to the way
tyres looked at the beginning of the previous century.
Sameh Affi from Renault presented an analysis of start“The tire industry has optimized the tread pattern as
the main influence parameter for exterior noise so that
nowadays the radiated sound pressure of a modern tire
in the far field can be very close to that of a slick tire
with the same construction but the new type approval
limits for vehicles will be quite challenging.“
Dr.-Ing. Ernst-Ulrich Saemann
Continental Reifen Deutschland GmbH
stop systems, which are not always positively perceived
by consumers in terms of noise and vibration. Renault is
attempting to optimise the start times, noise and vibration
in hybrid vehicles via simulation.
Dirk Lieske from Daimler spoke about the optimisation of
e-vehicle powertrains. Daimler uses computer simulations
for the development of the Smart electric drive and the
B class to help reduce the “whine” or “singing” of electric
powertrains to a practically imperceptible level.
The keynote speech from Ernst-Ulrich Saemann, Continental Reifen Deutschland raised several key issues on
Steffen Borchert, development specialist for total vehicle
the very topical subject of vehicle pass-by noise legisla-
acoustics at BMW presented a simple, empirical formula
D. Lieske (Daimler)
Prof. H. List (AVL List GmbH)
S. Affi (Renault SA)
K. Vansant (Siemens Industry Software)
R. Scholz (MAGNA STEYR AG & CO KG)
B. Pluymers (Katholieke Universiteit Leuven)
that BMW use to be able to predict the final vehicle interior
noise levels at a very early stage in development, before
a prototype is even built. BMW is following a clear path
towards lightweight as demonstrated by the use of carbon
structures in the futuristic electric and hybrid models, i3
and i8.
The list of international speakers from universities, suppliers and OEMs included KTH Stockholm, RWTH Aachen,
Korea Advanced Institute of Science and Technology, Tsinghua University Beijing, Université de Sherbrooke in Canada, Continental Reifen Deutschland, BMW, Daimler, Hyundai, Renault, Toyota and Volvo to domestic giants such
as AVL List GmbH, Magna Steyr Fahrzeugtechnik, TU Graz
and of course, the VIRTUAL VEHICLE research centre.
Conclusion
The 2014 congress was yet another extremely successful event in the series of ISVNH conferences, which was
particularly notable for the open nature of the technical
discussions and the warm and cordial atmosphere of the
social events.
We would like to thank the participants for their positive
feedback, and we look forward to welcoming you back to
Graz for the 9th ISNVH Congress from June 22-24, 2016!
All presentations / contributions to the sessions can be
found on SAE International: www.papers.sae.org
Jost Bernasch, CEO VIRTUAL VEHICLE: “The ISNVH
congress in Graz brings together important international
automotive experts from fields such as vibration, noise
development and sound design. We are particularly pleased with the quality of the approximately 200 participants.
The expert dialogue generates enormous and sustainable
added value for the development of tomorrow’s vehicles,
both for us as a research centre and for the local partners
TU Graz, AVL and Magna.“
BEST PAPER AWARD for E. Tijs (Microflown Technologies)
Group of Chairmen and Programm Commitee members ISNVH 2014
9th International Styrian Noise,
Vibration & Harshness Congress
The European Automotive Noise Conference
in
cooperation
with
June 22-24, 2016 Graz / Austria www.isnvh.com
CONGRESS Graz
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General Information:
Congress location:
Congress office:
CONGRESS GRAZ
Sparkassenplatz 1
8010 Graz, AUSTRIA
VIRTUAL VEHICLE
Inffeldgasse 21A, 8010 Graz
Mrs. Julia D‘Orazio
Tel.:+43 (316) 873 9094
Fax: +43 (316) 873 9072
e-mail: [email protected]
Further information:
research and test center
www.isnvh.com
research and test center