{
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{
"paperId": "b108e6e11f4a96d5058945f3b582a032e8204ade",
"url": "https://www.semanticscholar.org/paper/b108e6e11f4a96d5058945f3b582a032e8204ade",
"title": "Multifidelity Gaussian processes for failure boundary andprobability estimation",
"abstract": "Estimating probability of failure in aerospace systems is a critical requirement for flight certification and qualification. Failure probability estimation (FPE) involves resolving tails of probability distribution and Monte Carlo (MC) sampling methods are intractable when expensive high-fidelity simulations have to be queried. We propose a method to use models of multiple fidelities, which trade accuracy for computational efficiency. Specifically, we propose the use of multifidelity Gaussian process models to efficiently fuse models at multiple fidelity. Furthermore, we propose a novel acquisition function within a Bayesian optimization framework, which can sequentially select samples (or batches of samples for parallel evaluation) from appropriate fidelity models to make predictions about quantities of interest in the highest fidelity. We use our proposed approach within a multifidelity importance sampling (MFIS) setting, and demonstrate our method on the failure level set estimation on synthetic test functions as well as the transonic flow past an airfoil wing section.",
"referenceCount": 49,
"authors": [
{
"authorId": "98543101",
"name": "Ashwin Renganathan"
},
{
"authorId": "144321616",
"name": "Vishwas Rao"
},
{
"authorId": "143672238",
"name": "Ionel M. Navon"
}
]
},
{
"paperId": "963a5c60ada159d27641a284008f57d6419b26f2",
"url": "https://www.semanticscholar.org/paper/963a5c60ada159d27641a284008f57d6419b26f2",
"title": "Generative Transfer Optimization for Aerodynamic Design",
"abstract": "Transfer optimization, one type of optimization methods, which leverages knowledge of the completed tasks to accelerate the design progress of a new task, has been in widespread use in machine learning community. However, when applying transfer optimization to accelerate the progress of aerodynamic shape optimization (ASO), two challenges are encountered in sequence, that is, (1) how to build a shared design space among the related aerodynamic design tasks, and (2) how to exchange information between tasks most efficiently. To address the first challenge, a datadriven generative model is used to learn airfoil representations from the existing database, with the aim of synthesizing various airfoil shapes in a shared design space. To address the second challenge, both singleand multifidelity Gaussian processes (GPs) are employed to carry out optimization. On one hand, the multifidelity GP is used to leverage knowledge from the completed tasks. On the other hand, mutual learning is established between singleand multifidelity GP models by exchanging information between them in each optimization cycle. With the above, a generative transfer optimization (GTO) framework is proposed to shorten the design cycle of aerodynamic design. Through airfoil optimizations at different working conditions, the effectiveness of the proposed GTO framework is demonstrated.",
"referenceCount": 16,
"authors": [
{
"authorId": "2149505113",
"name": "Zhendong Guo"
},
{
"authorId": "2153199285",
"name": "Wei Sun"
},
{
"authorId": "50258957",
"name": "Liming Song"
},
{
"authorId": "46276037",
"name": "Jun Yu Li"
},
{
"authorId": "73325644",
"name": "Z. Feng"
}
]
},
… (truncated due to length)