Acoustic meshing times slashed

LMS International has announced a partnership with Detroit Engineered Products to create a new software module that will accelerate the acoustic modelling process. A modelling process that took a couple of weeks should be reduced to a couple of hours, according to the company.

Acoustic modelling is widely used in mechanical industries to predict the sound that a product, such as a powertrain, will radiate. Once the model is built, the design can then be refined and optimised in ‘virtual space’ long before a physical prototype is made. This results in better products, a shorter development time – and significant cost savings.

The LMS/DEP technology addresses a bottleneck in the current process: the creation of the acoustic mesh for Boundary Element Analysis. The creation of this mesh is required to reduce the complexity of the structural model, so that it only reflects those physical features that will have an effect on the acoustic behaviour. Because the model complexity is significantly reduced, often by a factor of ten, it results in a much faster acoustic solver run. Indeed, it sometimes makes it possible.

The unique LMS/DEP approach can be likened to wrapping the structure with a rubber sheet: the element size of this rubber mesh being related to the frequency range of interest. Small surface features such as a bolt-hole or a small rib are therefore smoothed, but those features which determine the acoustic response remain. In tests, a car powertrain with over 150,000 elements was reduced to an acoustic mesh of 5,000 elements in just a couple of hours. Previously, it would take a couple of weeks to interactively reduce the size of the model.

The new technology will be provided in the first wave of LMS next generation CAE solutions, called LMS Virtual.Lab. The first release of Virtual.Lab will be introduced in the autumn of this year.

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