Multi-objective Global Optimization for Deformation Near a Hole in an Oxide Forming Alloy Foil Subjected to Thermal Cycling

Li, Feng-Xun; Li, Zhen-Zhe

doi:10.1007/s40684-018-0027-4

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…The difference between the traditional genetic algorithm and the multi-island algorithm is that the multi-island genetic algorithm divides the entire population into several subgroups. The groups are isolated from each other on different islands, where each subgroup evolves independently instead of all the populations adopting the same evolution mechanism, and each island carries out a migration operation at a certain time interval so that each island’s multi-island genetic algorithm can effectively increase the speed of calculation; several independently evolved subgroups increase the genetic diversity of the entire population, so it can also avoid the premature phenomenon of traditional genetic algorithms, which is conducive to finding the global optimum untie. − …”

Section: Optimal Results and Discussionmentioning

confidence: 99%

Fault Tolerance Optimization of a Lithium Battery Pack Having a Damaged Unit

Chen

Wang

et al. 2022

ACS Omega

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As a kind of green and sustainable technology, electric vehicles are continuously highlighted for solving the significant problems of energy and air pollution. In this paper, fault tolerance optimization of an air-cooled lithium battery pack having a damaged unit was considered to improve the heat dissipation performance. For constructing the relationship between the objective function and the design variables, a quadratic polynomial response function was set up based on the experimental points, which were selected by the Latin-hypercube design of experiment method. Then, a multi-island genetic algorithm-based optimization of the battery pack having a damaged unit was performed under the condition of adjusting the flow velocity of each inlet. The results show that the acceptable temperature differences were obtained under the condition of fixing the total mass flow rate of the inlets. The simulation and fault tolerance optimization methods recommended in this study can be widely used to improve the real safety level of the systems.

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Section: Optimal Results and Discussionmentioning

confidence: 99%

Fault Tolerance Optimization of a Lithium Battery Pack Having a Damaged Unit

Chen

Wang

et al. 2022

ACS Omega

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“…In our previous study, − a 2-layer theoretical model was derived to study the hole deformation under the thermal cycling loads. However, the results of the 2-layer theoretical model give good agreement on the behavior of the hole with the TGO layer forming on the inner surfaces as well as the lateral outer surface of the hole.…”

Section: Introductionmentioning

confidence: 99%

Deformation Prediction Theory of Thermal Barrier Coatings near Cooling Holes under Thermal Cycling

et al. 2023

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Thermal barrier coating (TBC) systems are widely adopted in gas turbine blades to improve the thermal efficiency of gas turbine engines. However, TBC failure will happen due to the thermal stress between the different layers of the TBC systems. The traditional two-layer theoretical model only considers TGO (thermally grown oxide) and a substrate in the inner cooling hole with the surface uncoated, which results in poor prediction of the deformations of the TBC systems. It should be mentioned that the effect of TBC is very important because the thickness of TBC is much larger than the TGO thickness. In this study, a new three-layer theoretical model was derived, which is composed of the cylindrical TGO and TBC mounted in the substrate with a circular hole, and the stress and strain of TGO near the cooling hole under the condition of the thermal cycles were calculated. The high temperature characteristics of TGO and the substrate including the high temperature strength and growth ratio were from the experiments. The results show that the strain of the developed three-layer model is irrelevant with increasing number of cycles, which indicates that TBC in the cooling hole significantly inhibits the deformation of TGO near the cooling hole. Therefore, aimed at confirming the feasibility of the three-layer theoretical model, the finite element analysis with coating in the cooling hole and on the surface was carried out with a three-layer axisymmetric model, which proves that the 3-layer theoretical model can predict the deformation trend near the cooling hole.

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