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ESI Group has announced the completion of Renault’s first fully virtual preliminary design of a seat using Pam-Comfort, ESI’s advanced solution for Virtual Seat Prototyping.

Pam-Comfort offers a scalable, customised solution dedicated to virtual manufacturing and virtual testing (static and dynamic) of the soft parts of a seat.

Virtual Seat Prototyping consists of several chained simulated steps ranging from seat manufacturing, occupant static seating, to occupied seat NVH, where the stresses resulting from each step are needed for the next one.

The chaining is a necessary requirement to accurately predict the behaviour of the seats under numerous loading conditions and for various design changes.

At Renault, an important step after the preliminary design of a seat model is the virtual testing of the dynamic comfort performance using Pam-Comfort.

In order to accurately predict seat comfort, Renault runs a dynamic test of seat transmissibility with a static weight.

The test helps evaluate the seat frequency response and informs Renault about how the seat contributes to the vertical acceleration filtering of the car.

This test is used improve and validate the seat design and is simulated with a Finite Element calculation using Pam-Comfort.

After completing the seat manufacturing simulations, a dummy is imported in the model to launch the computation.

This calculation is divided in two phases: first, a static phase where the dummy is seated and where the equilibrium is computed to precisely know the stress and strain states of the various parts of the seat; and second, a dynamic phase where a vertical-acceleration signal is applied to the seat rail to obtain the seat dynamic transmissibility at the interface with the dummy.

ESI is a world-leading supplier and pioneer of digital simulation software
for prototyping and manufacturing processes that take into account the
physics of materials.

ESI has developed an extensive suite of coherent, industry-oriented
applications to realistically simulate a product’s behavior during testing,
to fine-tune manufacturing processes in accordance with desired product
performance, and to evaluate the environment’s impact on product

ESI’s products represent a unique collaborative and open environment for
Simulation-Based Design, enabling virtual prototypes to be improved in a
continuous and collaborative manner while eliminating the need for physical
prototypes during product development.

A scalable Simulation-Based Design solution to accelerate innovation

ESI’s End-to-End Virtual Prototyping solutions, including software and
services, allow to manage with remarkable efficiency the virtual prototyping
of industrial products from creation through to end development, to limit
its complexity and risks, resulting in the successful validation of real
prototypes “to get it right at the right time”.

The company employs over 750 high-level specialists worldwide covering more
than 30 countries.

ESI Group is listed in compartment C of NYSE Euronext Paris.

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