In this paper a method for optimizing structures numerically with regard to structure borne sound is presented. The finite element method (FEM) is used to calculate the surface velocities of the vibrating structure which is discretized with 3D solid elements. Next, Powell's COBYLA algorithm is used to modify the geometry of the structure in such a way that the level of structure borne sound is reduced. A new FEM input file is generated, and the whole process is repeated iteratively until a stop criterion is met. In order to reduce the number of design variables (and therefore the computation time) the surface of the structure is modeled using spline functions. For a simple example structure the level of structure borne sound is reduced by more than 6 dB.
Document Type: Research Article
Publication date: January 1, 2003
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Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.