Multi-fidelity design optimization method for shell structure of autonomous underwater vehicle

Abstract

The invention discloses a multi-fidelity design optimization method for a shell structure of an autonomous underwater vehicle. A multi-fidelity method of an addition bridging function based on a Kriging model is adopted, a multi-start optimization method and a unique self-adaptive model updating strategy are combined, and accordingly design optimization of the shell structure is conducted. The multi-fidelity method is adopted to construct an agent model of which the maximum stress of the shell structure avoids the instability of the critical load, when the agent model is constructed, a large amount of low-fidelity calculation and analysis are used, the precision of the model is improved, and meanwhile the total calculation cost of the optimization process of the structure design is reduced. During sequence optimization, a new agent model is adopted to update the strategy; meanwhile, an optimum point of the current model and an MSE maximum point of the current model are added into high and low fidelity sampling points; through the MSE maximum point of the added model, the global space can be sufficiently explored, and accordingly the total precision of the agent model is improved; accordingly, an optimum design scheme is obtained, and the precision and efficiency of design optimization are improved.

Description

technical field [0001] The invention relates to the field of shell structure design of an underwater vehicle, in particular to a multi-fidelity design optimization method for a shell structure of an autonomous underwater vehicle. Background technique [0002] Autonomous Underwater Vehicle (AUV) is a multifunctional underwater robot that can conduct scientific investigations, ocean exploration and military reconnaissance. At present, underwater vehicles are developing in the direction of large depth, long range and light weight. The shell of the autonomous underwater vehicle is mainly used to bear the load, as the support and containment of the internal equipment, so the structure design of the shell plays a very important role in the design of the entire vehicle system, and the quality of the structural design is directly related to the entire navigation. The system performance and practical application of the device. The purpose of structural design of the underwater vehi...

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Problems solved by technology

[0007] In order to avoid the low design accuracy of the underwater vehicle shell structure design optimization method existing in the prior art, and the problems of excessive calculation and low efficiency o

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