MSC Software Corporation announces that the Laboratoire Vibrations Acoustique (LVA) of the Institut National des Sciences Appliquées de Lyon, one of Europe's leading science and technology schools, has chosen Actran acoustic analysis software to develop innovative acoustic methods in the laboratory.
Created in the 1970s, the Laboratoire Vibrations Acoustique (LVA) is designed to create links between various fields of research such as structural dynamics and acoustics. The LVA applies numerical modeling and simulation to several fields of research in order to develop innovative methods that can be applied first to theoretical problems, then to real systems, in order to demonstrate their potential for use in industrial processes.
Acoustic source identification and inverse methods are representative of the areas in which new simulation processes are benefiting from method development initiatives at the LVA. In acoustics, inverse methods cover a wide spectrum of applications, all based on the same concept: identifying the sources of a linear system by observing the signals emitted by it. However, the term identification methods covers a wide range of objectives, from locating sources in large acoustic spaces to reconstructing the source field in theoretical or complex geometries, identifying the noise source in closed sound fields, source separation and source classification. There is no single method for all these applications, but several specialized methods have been developed over the decades. The LVA is developing new methods for reconstructing the velocity field of a complex structure by measuring the noise emitted by that source. For example, an oil sump radiates noise due to its vibrations. By measuring the noise radiated in a virtual box surrounding the oil sump, the method developed by the LVA enables speed and pressure fields to be reconstructed with greater accuracy.
" Actran has played an important role in the development of these methods "explains Nicolas Totaro, Senior Lecturer at the LVA. " Firstly, Actran provides the input data representing the system and needed to apply the method: the modal basis of the virtual cavity, in terms of acoustic pressure and particle velocity. These data are essential, as they enable the method to be applied. Secondly, Actran can be used for numerical experiments to define the limits and capabilities of the method. The current method is intrinsically experimental, but Actran replaces time-consuming experiments in the first validation stage, even though measurements under real conditions are still necessary. All the conclusions reached using Actran have been confirmed by measurements. "
" The acoustic performance of products is an increasingly important factor in various industries, not only to comply with noise reduction laws and regulations, but also because of the need to create pleasant sounds and improve sound quality. "explains Ze Zhou, FFT's Director of Product Marketing.
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