{"title":"柔性多体系统特征频率的拓扑优化","authors":"Jialiang Sun, Zhengzheng Cai","doi":"10.1007/s11044-024-10018-0","DOIUrl":null,"url":null,"abstract":"<p>The intricate dynamic characteristics of a flexible multibody system (FMBS) have a profound influence on the dynamic behavior of the system. In this paper, a topology optimization approach is proposed to confront the challenge of manipulating the eigenfrequencies of an FMBS. Firstly, an accurate dynamic model of an FMBS is established through the perspective of the absolute nodal coordinate formulation (ANCF). Within the mathematical framework, the eigenvalue problem is appropriately extracted, thereby the frequencies and the corresponding mode shapes of an FMBS can be obtained. To firmly verify the dynamic model and the modal solution, an in-depth validation is carried out by comparing the modal analysis of a four-bar mechanism with the results in ABAQUS. Secondly, the modal solution method and the density-based topology optimization method are combined to formulate a generalized topology optimization problem for the eigenfrequencies of an FMBS. The sensitivities for a single eigenfrequency and multiple repeated eigenfrequencies of an FMBS are derived for efficient optimization computation. Finally, the dynamic characteristic topology optimization of a rigid–flexible inflatable structure is conducted to strongly demonstrate the effectiveness and efficiency of the proposed topology optimization approach, which maximizes the first eigenfrequency and the gap between two consecutive eigenfrequencies of the inflatable structure.</p>","PeriodicalId":49792,"journal":{"name":"Multibody System Dynamics","volume":"1 1","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Topology optimization for eigenfrequencies of a flexible multibody system\",\"authors\":\"Jialiang Sun, Zhengzheng Cai\",\"doi\":\"10.1007/s11044-024-10018-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The intricate dynamic characteristics of a flexible multibody system (FMBS) have a profound influence on the dynamic behavior of the system. In this paper, a topology optimization approach is proposed to confront the challenge of manipulating the eigenfrequencies of an FMBS. Firstly, an accurate dynamic model of an FMBS is established through the perspective of the absolute nodal coordinate formulation (ANCF). Within the mathematical framework, the eigenvalue problem is appropriately extracted, thereby the frequencies and the corresponding mode shapes of an FMBS can be obtained. To firmly verify the dynamic model and the modal solution, an in-depth validation is carried out by comparing the modal analysis of a four-bar mechanism with the results in ABAQUS. Secondly, the modal solution method and the density-based topology optimization method are combined to formulate a generalized topology optimization problem for the eigenfrequencies of an FMBS. The sensitivities for a single eigenfrequency and multiple repeated eigenfrequencies of an FMBS are derived for efficient optimization computation. Finally, the dynamic characteristic topology optimization of a rigid–flexible inflatable structure is conducted to strongly demonstrate the effectiveness and efficiency of the proposed topology optimization approach, which maximizes the first eigenfrequency and the gap between two consecutive eigenfrequencies of the inflatable structure.</p>\",\"PeriodicalId\":49792,\"journal\":{\"name\":\"Multibody System Dynamics\",\"volume\":\"1 1\",\"pages\":\"\"},\"PeriodicalIF\":2.6000,\"publicationDate\":\"2024-08-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Multibody System Dynamics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1007/s11044-024-10018-0\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MECHANICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Multibody System Dynamics","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s11044-024-10018-0","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MECHANICS","Score":null,"Total":0}
Topology optimization for eigenfrequencies of a flexible multibody system
The intricate dynamic characteristics of a flexible multibody system (FMBS) have a profound influence on the dynamic behavior of the system. In this paper, a topology optimization approach is proposed to confront the challenge of manipulating the eigenfrequencies of an FMBS. Firstly, an accurate dynamic model of an FMBS is established through the perspective of the absolute nodal coordinate formulation (ANCF). Within the mathematical framework, the eigenvalue problem is appropriately extracted, thereby the frequencies and the corresponding mode shapes of an FMBS can be obtained. To firmly verify the dynamic model and the modal solution, an in-depth validation is carried out by comparing the modal analysis of a four-bar mechanism with the results in ABAQUS. Secondly, the modal solution method and the density-based topology optimization method are combined to formulate a generalized topology optimization problem for the eigenfrequencies of an FMBS. The sensitivities for a single eigenfrequency and multiple repeated eigenfrequencies of an FMBS are derived for efficient optimization computation. Finally, the dynamic characteristic topology optimization of a rigid–flexible inflatable structure is conducted to strongly demonstrate the effectiveness and efficiency of the proposed topology optimization approach, which maximizes the first eigenfrequency and the gap between two consecutive eigenfrequencies of the inflatable structure.
期刊介绍:
The journal Multibody System Dynamics treats theoretical and computational methods in rigid and flexible multibody systems, their application, and the experimental procedures used to validate the theoretical foundations.
The research reported addresses computational and experimental aspects and their application to classical and emerging fields in science and technology. Both development and application aspects of multibody dynamics are relevant, in particular in the fields of control, optimization, real-time simulation, parallel computation, workspace and path planning, reliability, and durability. The journal also publishes articles covering application fields such as vehicle dynamics, aerospace technology, robotics and mechatronics, machine dynamics, crashworthiness, biomechanics, artificial intelligence, and system identification if they involve or contribute to the field of Multibody System Dynamics.