Component and system reliability-based topology optimization using a single-loop method |
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Authors: | Mariana Silva Daniel A. Tortorelli Julian A. Norato Christopher Ha Ha-Rok Bae |
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Affiliation: | (1) School of Industrial and Systems Engineering, Georgia Institute of Technology, 755 Ferst Drive, 30332-0205 Atlanta, GA, USA;(2) Georgia Institute of Technology, The School of Industrial and Systems Engineering, 765 Ferst Drive, Campus Box 0205, 30332 Atlanta, GA, USA |
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Abstract: | We perform reliability-based topology optimization by combining reliability analysis and material distribution topology design methods to design linear elastic structures subject to random inputs, such as random loadings. Both component reliability and system reliability are considered. In component reliability, we satisfy numerous probabilistic constraints which quantify the failure of different events. In system reliability, we satisfy a single probabilistic constraint which encompasses the component events. We adopt the first-order reliability method to approximate the component reliabilities and the inclusion-exclusion rule to approximate the system reliability. To solve the probabilistic optimization problem, we use a variant of the single loop method, which eliminates the need for an inner reliability analysis loop. The proposed method is amenable to implementation with existing deterministic topology optimization software, and hence suitable for practical applications. Designs obtained from component and system reliability-based topology optimization are compared to those obtained from traditional deterministic topology optimization and validated via Monte Carlo simulation. |
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