{"title":"随机激励下弯曲薄壁结构加劲肋布置的拓扑优化方法","authors":"Haotian Yang , Renjing Gao , Shutian Liu","doi":"10.1016/j.compstruc.2025.107882","DOIUrl":null,"url":null,"abstract":"<div><div>Traditional topology optimization methods for curved thin-walled stiffened structures predominantly focus on static load conditions, neglecting the critical influence of random excitations. This paper presents a topology optimization method for stiffener layout design of curved thin-walled structures under random excitations. This method takes the root-mean-square value of von Mises stress as the optimization objective, and ensures the structural safety margin under the random excitation by optimizing the stiffener layout. For the random dynamic response, the pseudo excitation method is utilized to calculate the response values. For the topological design, the coordinates of the endpoints of stiffeners are considered as the positional design variables to find the optimal layout, and the relative thicknesses of stiffeners are considered as the topological design variables to realize the material increase or decrease. In order to solve the local modal problem caused by variations in stiffener thickness, a penalty mechanism based on the Heaviside function is constructed to penalize the stiffener relative thickness and material density. In addition, an adaptive mesh discretization strategy is proposed to seamlessly couple the base panel and stiffener elements. Numerical examples demonstrate that the topology configurations obtained by the proposed method exhibit a lower random dynamic response compared with the equivalent static topology designs.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"316 ","pages":"Article 107882"},"PeriodicalIF":4.8000,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Topology optimization method for stiffener layout design of curved thin-walled structures under random excitations\",\"authors\":\"Haotian Yang , Renjing Gao , Shutian Liu\",\"doi\":\"10.1016/j.compstruc.2025.107882\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Traditional topology optimization methods for curved thin-walled stiffened structures predominantly focus on static load conditions, neglecting the critical influence of random excitations. This paper presents a topology optimization method for stiffener layout design of curved thin-walled structures under random excitations. This method takes the root-mean-square value of von Mises stress as the optimization objective, and ensures the structural safety margin under the random excitation by optimizing the stiffener layout. For the random dynamic response, the pseudo excitation method is utilized to calculate the response values. For the topological design, the coordinates of the endpoints of stiffeners are considered as the positional design variables to find the optimal layout, and the relative thicknesses of stiffeners are considered as the topological design variables to realize the material increase or decrease. In order to solve the local modal problem caused by variations in stiffener thickness, a penalty mechanism based on the Heaviside function is constructed to penalize the stiffener relative thickness and material density. In addition, an adaptive mesh discretization strategy is proposed to seamlessly couple the base panel and stiffener elements. Numerical examples demonstrate that the topology configurations obtained by the proposed method exhibit a lower random dynamic response compared with the equivalent static topology designs.</div></div>\",\"PeriodicalId\":50626,\"journal\":{\"name\":\"Computers & Structures\",\"volume\":\"316 \",\"pages\":\"Article 107882\"},\"PeriodicalIF\":4.8000,\"publicationDate\":\"2025-07-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Computers & Structures\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0045794925002408\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Computers & Structures","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0045794925002408","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS","Score":null,"Total":0}
Topology optimization method for stiffener layout design of curved thin-walled structures under random excitations
Traditional topology optimization methods for curved thin-walled stiffened structures predominantly focus on static load conditions, neglecting the critical influence of random excitations. This paper presents a topology optimization method for stiffener layout design of curved thin-walled structures under random excitations. This method takes the root-mean-square value of von Mises stress as the optimization objective, and ensures the structural safety margin under the random excitation by optimizing the stiffener layout. For the random dynamic response, the pseudo excitation method is utilized to calculate the response values. For the topological design, the coordinates of the endpoints of stiffeners are considered as the positional design variables to find the optimal layout, and the relative thicknesses of stiffeners are considered as the topological design variables to realize the material increase or decrease. In order to solve the local modal problem caused by variations in stiffener thickness, a penalty mechanism based on the Heaviside function is constructed to penalize the stiffener relative thickness and material density. In addition, an adaptive mesh discretization strategy is proposed to seamlessly couple the base panel and stiffener elements. Numerical examples demonstrate that the topology configurations obtained by the proposed method exhibit a lower random dynamic response compared with the equivalent static topology designs.
期刊介绍:
Computers & Structures publishes advances in the development and use of computational methods for the solution of problems in engineering and the sciences. The range of appropriate contributions is wide, and includes papers on establishing appropriate mathematical models and their numerical solution in all areas of mechanics. The journal also includes articles that present a substantial review of a field in the topics of the journal.