Journal article
Fail-safe optimization of tubular frame structures under stress and eigenfrequency requirements
Structural Integrity and Loads Assessment, Wind Energy Materials and Components Division, Department of Wind Energy, Technical University of Denmark1
Department of Wind Energy, Technical University of Denmark2
System Engineering and Optimization, Wind Energy Systems Division, Department of Wind Energy, Technical University of Denmark3
In conventional fail-safe optimization of frame structures the damage is usually modelled as complete removal of one or more members. We propose and incorporate two additional types of damage models into the fail-safe design problem. The first describes thickness degradation caused e.g. by corrosion.
The second describes severe local damage by removal of a part of a member that causes a gap and free ends in the member. The latter damage model can cause undesirable local vibration modes. By combining the two damage models, local thickness degradation in a part of a member can be modelled. The considered design problem minimizes structural mass and includes local stress constraints and limits on eigenfrequencies.
Besides the new damage models, a working-set algorithm is applied on the fail-safe optimization problem to reduce the computational cost. Numerical experiments on two-dimensional frame structures illustrate that the working-set algorithm can effectively handle the relatively large number of constraints and damage scenarios in fail-safe optimization.
Language: | English |
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Year: | 2022 |
Pages: | 106684 |
ISSN: | 18792243 and 00457949 |
Types: | Journal article |
DOI: | 10.1016/j.compstruc.2021.106684 |
ORCIDs: | Dou, Suguang and Stolpe, Mathias |
Eigenfrequency constraints Fail-safe structural optimization Local stress constraitns Turbular frame structure Working-set algorithm