Maximum machining error design method for acoustic metamaterial microstructure

Abstract

According to the acoustic metamaterial microstructure maximum machining error design method, based on a robustness analysis method of reverse design thinking, from design requirements, an acceptable target change range and an acceptable constraint change range are mapped to an uncertain parameter space, and the maximum machining error of an acoustic metamaterial microstructure is obtained. The maximum machining error interval is determined according to the sensitivity area of the parameter space; the SVM classification model is combined with the robustness analysis method, the SVM model is used for replacing analog simulation of the target response value and the constraint response value in the robustness analysis process, the simulation cost is remarkably reduced, and the solving efficiency of robustness analysis is improved.

Description

technical field [0001] The invention belongs to the field of acoustic metamaterials, and relates to a design method for the maximum processing error of the microstructure of acoustic metamaterials. Background technique [0002] Metamaterials have artificial composite structures with extraordinary properties that natural materials do not have. By designing the shape, size, and arrangement of microstructural units in subwavelength scales, they can have special physical properties such as strong anisotropy and negative parameter properties. The macroscopic properties of metamaterials depend on their special structure rather than the intrinsic properties of the material. The emergence of metamaterials has greatly expanded the choice of materials in the field of acoustics, and provided a new way for the design of acoustic devices such as invisibility cloaks. Acoustic metamaterials based on acoustic transformation theory can effectively control acoustic waves and elastic waves of...

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Problems solved by technology

[0003] Due to the large number of microstructural parameters, the relationship between changes in geometric parameters and acoustic performance is complex and difficult to quantify directly

At the same time, the performance of acoustic metamaterials is closely related to the actual size of each geometric parameter. Although the existing research provides a variety of methods for the preparation of acoustic metamaterials, if the processing accuracy is too low, it may not be possible to guarantee the final acoustic performance. Design requirements; and if you choose too strict processing requirements, it will bring expensive manufacturing costs

The traditional acoustic metamaterial structure design process often does not consider the influence of processing uncertainty on the performance of acoustic devices, which will lead to unexpected deviations in its actual performance, and may even make the existing design schemes unsuitable for engineering applications.

At the same time, the nonlinearity and implicitness of metamaterial performance are high, and it is difficult to directly establish the influence of design parameter changes on acoustic performance.

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