Journal
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
Volume 52, Issue 4, Pages 737-754Publisher
SPRINGER
DOI: 10.1007/s00158-015-1265-5
Keywords
Topology optimization; Robust design; Wave propagation; Acoustics; Noise reduction; Projection filtering; Uniform design variations; Non-uniform design variations
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Funding
- Villum Fonden through the research project Topology Optimization - the Next Generation NextTop
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Resonance and wave-propagation problems are known to be highly sensitive towards parameter variations. This paper discusses topology optimization formulations for creating designs that perform robustly under spatial variations for acoustic cavity problems. For several structural problems, robust topology optimization methods have already proven their worth. However, it is shown that direct application of such methods is not suitable for the acoustic problem under consideration. A new double filter approach is suggested which makes robust optimization for spatial variations possible. Its effect and limitations are discussed. In addition, a known explicit penalization approach is considered for comparison. For near-uniform spatial variations it is shown that highly robust designs can be obtained using the double filter approach. It is finally demonstrated that taking non-uniform variations into account further improves the robustness of the designs.
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