ESI Group : Hyundai Motor Company virtually tests for seat vibrations early in
the development process thanks to ESI's Virtual Seat Solution
Hyundai Motor Company virtually tests
for seat vibrations early in the development
process thanks to ESI's Virtual Seat Solution
Improving the comfort of vehicle occupant
Paris, France - June 27, 2013 - ESI Group, pioneer and world-leading solution
provider in virtual prototypingfor manufacturing industries, announces that
Hyundai Motor Company has extended its usage of Virtual Seat Solution to
dynamic comfort testing, in order to assess and improve the vibratory comfort
of their car seats.
Reducing seat vibrations greatly contributes to improving a seat's overall
dynamic comfort, by protecting the occupant from muscular fatigue; an
important issue for long journeys and with possible long-term effects on the
spine. Han Ji Won, Engineer, Body & Trim development team at Hyundai Motor
Company, declares, "Since seats contain lots of components, it's very
difficult to find the factors that influence the dynamic comfort of the seat.
We tried to figure this out using ESI's Virtual Seat Solutionand reached our
goal. This new way of working will help us save money and time effectively."
ESI's end-to-end Virtual Seat Solution, dedicated to the virtual
manufacturing, testing and optimization of seats, has been used by Hyundai for
many years to conduct virtual tests in several seat performance domains;
including seating posture and body pressure and foam hardness. Recently,
Hyundai's Body & Trim development team sought to extend their usage of Virtual
Seat Solution to evaluate dynamic comfort.
Traditionally, carmakers assess seat vibrations by asking volunteers to
provide feedback on vibrations they experience; a method that delivers highly
subjective results and has poor repeatability for many reasons, including the
change of volunteer morphology with time. In an effort to overcome these
drawbacks, Hyundai engineers started by developing and calibrating a new
dynamic dummy model dedicated to vibratory tests.
With ESI's Virtual Seat Solution, Hyundai engineers now use their dynamic
dummy model to perform complete virtual dynamic tests of an occupied seat. The
first step is to simulate the dummy sitting in the seat. This step is
mandatory as it allows determination of the non-uniform compression of the
foam in cushions of the occupied seat.
Seat and dummy model used to test virtually dynamic comfort performance with
Virtual Seat Solution;
Graph showing good correlation between real and virtual prototypes.
The second step is to simulate the vibrations test with the seated dummy to
obtain the transfer function that describes the capacity of the seat to absorb
the vibrations. To achieve good correlation with real testing it is essential
that the seat model - in particular the foam - inherits the correct properties
from both the seat fabrication and dummy seating by "chaining" simulations of
each step in the complete process.
Thanks to this fully validated dummy model, Hyundai performs virtual dynamic
comfort testing with ESI's Virtual Seat Solution earlier in the development
process and can better arrive at the right seat design. The virtual vibration
test is accurate and partly replaces real prototypes, thus allowing the car
manufacturer to develop more comfortable seat designs in less time and at less
cost. Virtual Seat Solution also saves time and increases efficiency by using
a single core model of the seat to support evaluation of several seat
performance domains and to enable design team collaboration.
About Hyundai Motor Company
Hyundai Motor Company is a South Korean company founded in 1967. The company
employs about 75,000 persons worldwide and sells vehicles throughout 193
countries. According to the brand consulting group Interbrand, their brand
value reaches USD 6 billion in 2011. Hyundai Motor Company manufactures
innovative cars from design to chassis including package layout ergonomics,
powertrain and electronics. They take into account new technology and safety
for new technologies. Hyundai has R&D centers in Namyang and overseas and
gradually increases investment to develop core technologies for eco-friendly
cars, such as hybrid and electric vehicles, as well as advanced in-vehicle
About ESI Group
ESI is a pioneer and world-leading provider in Virtual Prototyping that takes
into account the physics of materials. ESI boasts a unique know-how in Virtual
Product Engineering, based on an integrated suite of coherent,
industry-oriented applications. Addressing manufacturing industries, Virtual
Product Engineering aims to replace physical prototypes by realistically
simulating a product's behavior during testing, to fine-tune fabrication and
assembly processes in accordance with desired product performance, and to
evaluate the impact on product use under normal or accidental conditions.
ESI's solutions fit into a single collaborative and open environment for
End-to-End Virtual Prototyping. These solutions are delivered using the latest
technologies, including immersive Virtual Reality, to bring products to life
in 3D; helping customers make the right decisions throughout product
The company employs about 1000 high-level specialists worldwide covering more
than 40 countries. ESI Group is listed in compartment C of NYSE Euronext
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