Browse Publications Technical Papers 2005-01-2504
2005-05-16

A New Technique Combining Eigenfunction Expansions and Boundary Elements to Solve Acoustic Radiation Problems 2005-01-2504

A central problem in noise control involves the calculation of sound radiation and the holographic reconstruction of sources. A standard method for such calculations employs boundary elements and the surface Helmholtz integral equation (SHIE). However, difficulties occur at frequencies for which a congruent pressure-release boundary would have interior resonances. In such cases the SHIE does not have a unique solution and the matrix used in the boundary element method is singular. This talk will present a new technique which employs both eigenfunction expansions (typically using spherical wavefunctions) and boundary element matrices. This new method avoids problems with internal resonances and singular matrices, does not require adding internal “CHIEF” points, and permits fast and accurate holographic reconstructions for arbitrarily shaped sources. Advantageous operations termed “iterative deepening”, which automatically discards unnecessary eigenfunctions and detects any symmetries in the problem, and “forward refinement” with “parametric relaxation”, which guarantees convergence to a correct and accurate solution, will be presented. Application of this new method to inverse propagation will be discussed.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Noise Problems Associated with Geometrically Stiffened Panels

931265

View Details

TECHNICAL PAPER

The Reduction of Air-Rush Noise in Plastic Engine Intake Manifolds

2000-01-0044

View Details

TECHNICAL PAPER

Scaling Laws in Automotive Aeroacoustics

2009-01-0180

View Details

X