Acquisitions provide virtual acoustic prototyping

ESI Group has developed a complete new virtual acoustic prototyping solution.

ESI Group's virtual acoustic prototyping solution includes Rayon, a powerful low-frequency vibroacoustic software well suited for the prediction of trimmed vehicles' acoustic performances, and AutoSEA, the most effective software for the control of broadband airborne noise and sound-induced vibrations, such as acoustic noise from engine and tires of automotive and aerodynamic noise experienced by aircraft.

Noise and vibration are key attributes in the perceived quality of consumer and commercial products available on the market today.

As such it is imperative that product design engineers take these distinctive features into account during the design stage of the products life cycle.

What has always been difficult in the process for noise and vibration design is that no one technology covers the complete design frequency space.

This difficulty was compounded by the fact that, until recently, no one company provided both of the complementary technologies, boundary and finite element analysis (BEA/FEA) and statistical energy analysis (SEA).

With the acquisitions of Straco and Vibro-Acoustic Sciences, two specialized vibroacoustics software providers, ESI Group can now exploit the full benefit of the synergy between the two companies, as well as the latest developments in intermediary frequencies.

"Combining Straco and Vibro-Acoustic Sciences expertise and resources enables ESI Group to offer a global vibroacoustic solution for noise simulation and acoustic comfort", said Paul Bremner, CEO of ESI North America and Vibro-Acoustics Software Branch Manager, ESI Group.

"It also strengthens ESI Group presence in the automotive, defence and aeronautics sectors", said Mohamed Ali Hamdi, founder of Straco and Scientific Director of the Vibro-Acoustics Software Branch of ESI Group.

Rayon uses boundary and finite element methods to predict the vibroacoustic response at low frequencies.

AutoSEA uses statistical energy analysis method to predict the vibroacoustic response at higher frequencies.

At low frequencies, the response is typically dominated by natural normal modes, and discrete deterministic methods such as Boundary and Finite Element methods are valuable vibroacoustic analysis tools.

At higher frequencies, more and more modes contribute to the response and the vibroacoustic performance of a system becomes increasingly sensitive to small uncertainties in the properties of the system.

Discrete deterministic are no more efficient and statistical methods such as SEA are more useful to provide an efficient statistical prediction of the vibroacoustic response.

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