Automotive
ESI offers a complete set of vibro-acoustic simulation solutions for automotive engineering, significantly reducing prototyping costs that risk delaying time to market. In addition, ESI engineering services provide a global network of high level vibro-acoustic specialists to help you address your most critical challenges in vibro-acoustic engineering, or to train your engineers and deploy state-of-the-art methods and practices for vibro-acoustic engineering in your organization.
Success in the Field
Vehicle SEA modeling
Audi AG and ESI Group
Objective
Develop a SEA level model of a vehicle capable of predicting noise paths arising from structural and airborne excitation
Challenge
There are several paths in which noise can enter into a vehicle, both airborne and structure-borne the later having been found significant at lower frequencies (<1kHz). To predict the overall noise levels within a car, it is necessary to model the whole vehicle including structural and airborne sources. This helps determine external flanking paths and aero-acoustic effects.
Methodology
Create a system level vehicle model comprised of a stiff inner frame with acoustically active panels, such as the door outer panel and the window, with stiff non-radiating connecting components. Leaks into the door via water holes and waist seals together are also modelled with explicit modeling of the gasket and window seals taking into account the number of layers, materials and treatments deployed.
Suspension of the vehicle is also modelled using beams to transfer structural power, connected to each other and to the vehicle body using isolating springs to simulate the behavior of the mounting and bushes.
Result
A simulation process to support the design and account for the vibro-acoustic performance in the mid-frequency range starting from the early development phase.
“Hybrid FE-SEA analysis is a real leap forward when it comes to acoustic modeling technologies and is likely to set the standard for industrial computational acoustics of large structures for the future. The innovative integration of FE and SEA methods within one model allows the user to solve problems that cannot be addressed by applying SEA or FE methods separately.”
