Print Email Facebook Twitter Multi-material topology optimization of viscoelastically damped structures using a parametric level set method Title Multi-material topology optimization of viscoelastically damped structures using a parametric level set method Author van der Kolk, M. van der Veen, G.J. de Vreugd, J. Langelaar, M. Publication year 2017 Abstract The design of high performance instruments often involves the attenuation of poorly damped resonant modes. Current design practices typically rely on informed trial and error based modifications to improve dynamic performance. In this article, a multi-material topology optimization approach is presented as a systematic methodology to develop structures with optimal damping characteristics. The proposed method applies a multi-material, parametric, level set-based topology optimization to simultaneously distribute structural and viscoelastic material to optimize damping characteristics. The viscoelastic behavior is represented by a complex-valued material modulus resulting in a complex-valued eigenvalue problem. The structural loss factor is used as objective function during the optimization and is calculated using the complex-valued eigenmodes. An adjoint sensitivity analysis is presented that provides an analytical expression for the corresponding sensitivities. Multiple numerical examples are treated to illustrate the effectiveness of the approach and the influence of different viscoelastic material models on the optimized designs is studied. The optimization routine is able to generate designs for a number of eigenmodes and to attenuate a resonant mode of an existing structure. Subject 2015 Nano TechnologyOM - Opto-MechatronicsTS - Technical SciencesHigh Tech Systems & MaterialsIndustrial InnovationConstrained layer dampingLevel set methodLoss factorModal analysisMulti-material optimizationTopology optimizationViscoelastic damping To reference this document use: http://resolver.tudelft.nl/uuid:72861794-a14d-4bb0-bdf1-2b178f146bff DOI https://doi.org/10.1177/1077546315617333 TNO identifier 777393 Publisher SAGE Publications ISSN 1077-5463 Source Journal of Vibration and Control, 23 (15), 2430-2443 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.