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Leifur Leifsson
Reykjavík University
Mathematical optimizationSurrogate modelShape optimizationComputer scienceSpace mapping
85Publications
8H-index
298Citations
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Publications 161
Newest
#1Jin YanH-Index: 2
#2Simon LaflammeH-Index: 16
Last. Leifur LeifssonH-Index: 8
view all 3 authors...
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#1Dae Young Lee (Iowa State University)H-Index: 1
#2Leifur Leifsson (Iowa State University)H-Index: 15
Last. Seung Hwan Lee (Korea Aerospace University)H-Index: 2
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In this paper, an additional filler wire with opposite polarity was inserted in tandem flux cored arc welding process to increase the welding speed and deposition rate. In this hybrid welding, the ...
Source
#1Anand Amrit (Iowa State University)H-Index: 3
#2Leifur Leifsson (Iowa State University)H-Index: 8
Last. Slawomir Koziel (RU: Reykjavík University)H-Index: 44
view all 3 authors...
Exploration of design tradeoffs for aerodynamic surfaces requires solving of multi-objective optimization (MOO) problems. The major bottleneck here is the time-consuming evaluations of the computat...
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#1Xiaosong DuH-Index: 3
#2Leifur Leifsson (Iowa State University)H-Index: 8
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This work proposes a novel multifidelity metamodeling approach, the polynomial chaos-based Cokriging (PC-Cokriging). The proposed approach is used for fast uncertainty propagation in a reliability analysis of nondestructive testing systems using model-assisted probability of detection (MAPOD). In particular, PC-Cokriging is a multivariate version of polynomial chaos-based Kriging (PC-Kriging), which aims at combining the advantages of the regression-based polynomial chaos expansions and the inte...
Source
#1Leifur Leifsson (Iowa State University)H-Index: 8
#2Xiaosong Du (Iowa State University)H-Index: 3
Last. Slawomir Koziel (RU: Reykjavík University)H-Index: 44
view all 3 authors...
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#1Jin Yan (Iowa State University)H-Index: 2
#2Simon Laflamme (Iowa State University)H-Index: 16
Last. Chao Hu (Iowa State University)H-Index: 19
view all 7 authors...
The use of sensor networks for structural health monitoring purposes has gained popularity due to advances in electronics enabling the deployment of cost-effective solutions. However, linking signal to condition evaluation is still a difficult task, and metrics must be developed to validate the performance of a given sensor network at conducting its as-designed structural health monitoring task. In this paper, we present a model-assisted sensor network validation strategy. The strategy consists ...
#1Xiaosong Du (Iowa State University)H-Index: 3
#2Leifur Leifsson (Iowa State University)H-Index: 8
Last. Ronald A. Roberts (Iowa State University)H-Index: 10
view all 6 authors...
1 CitationsSource
#1Xiaosong Du (Iowa State University)H-Index: 3
#2Leifur Leifsson (Iowa State University)H-Index: 15
Last. Leifur Leifsson (Iowa State University)H-Index: 8
view all 2 authors...
Abstract In this work, utility theory is introduced to optimum aerodynamic shape design under uncertainty (also called robust aerodynamic design). Specifically, utility theory is used to formulate the objective function of the optimization problem. The advantage of the proposed approach over the commonly used weighted sum method is that it does not require the use of weighting factors or the addition of constraints on the statistical moments. The polynomial chaos expansion metamodel with the lea...
Source
#1Xiaosong Du (Iowa State University)H-Index: 3
#2Leifur Leifsson (Iowa State University)H-Index: 8
Last. Leifur Leifsson (Iowa State University)H-Index: 15
view all 2 authors...
Abstract This work introduces multifidelity metamodeling for reliability analysis of nondestructive testing (NDT) systems. Specifically, the Cokriging metamodel is utilized to accelerate the uncertainty propagation within model-assisted probability of detection (MAPOD) analysis of ultrasonic testing (UT) systems. The Cokriging multifidelity metamodel fuses a limited amount of data obtained from high-fidelity (HF) physics-based UT models, which are accurate but time-consuming to evaluate, with a ...
2 CitationsSource
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