Novel composite material structure optimization design method under high-dimensional random field condition

Abstract

The invention discloses a novel composite material structure optimization design method under a high-dimensional random field condition. The method comprises the following steps: firstly, according tothe complexity of a preparation process and a service environment of a novel composite material structure, establishing a high-dimensional random field model considering the related uncertainty of material attributes and a load space, and further establishing an optimal design model of the novel composite material structure under the influence of a high-dimensional random field according to high-rigidity lightweight design requirements; secondly, combining a random isogeometric analysis method with a random polynomial expansion enhanced Dagum kernel Kriging agent model, and efficiently and accurately calculating a statistical characteristic value of random response of the novel composite material structure under the influence of a high-dimensional random field; and finally, quickly obtaining optimal novel composite material structure design parameters by using a particle swarm algorithm. According to the method, high-dimensional randomness of material attributes and loads is comprehensively considered, and engineering practice is met; in optimization, random isogeometric analysis and an agent model are combined to calculate random response of the structure, and the method is efficient and accurate.

Description

technical field [0001] The invention relates to the engineering field, in particular to a novel composite material structure optimization design method under the condition of a high-dimensional random field. Background technique [0002] Composite materials have the advantages of light weight, high stiffness, and high strength, and their applications in engineering have become increasingly common in recent years. For example, structures with high strength and high rigidity performance requirements, such as hard rock roadheader cutterheads, are very suitable for use in composite materials. Due to the complex preparation process of composite materials, their material properties have obvious randomness. The service environment of new composite structures is often very complex and harsh. Taking the cutter head of a hard rock roadheader as an example, during the service process, the cutter head frequently collides with irregular hard objects such as rock fragments and gravel, a...

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Problems solved by technology

When the existing embedded random analysis deals with high-dimensional random problems, the explicit expression of the random response is very complicated, the dimension of the random stiffness matrix is ​​very high, and the calculation efficiency is very low

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