柔性多体系统特征频率的拓扑优化

IF 2.6 2区 工程技术 Q2 MECHANICS
Jialiang Sun, Zhengzheng Cai
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引用次数: 0

摘要

柔性多体系统(FMBS)错综复杂的动态特性对系统的动态行为有着深远的影响。本文提出了一种拓扑优化方法,以应对操纵 FMBS 特征频率的挑战。首先,本文从绝对节点坐标公式(ANCF)的角度出发,建立了 FMBS 的精确动态模型。在数学框架内,适当提取特征值问题,从而获得 FMBS 的频率和相应的模态振型。为了牢固地验证动态模型和模态解法,我们通过比较四杆机构的模态分析和 ABAQUS 的结果进行了深入验证。其次,将模态求解方法与基于密度的拓扑优化方法相结合,提出了一个针对 FMBS 特征频率的广义拓扑优化问题。得出了 FMBS 单个特征频率和多个重复特征频率的敏感度,从而实现了高效的优化计算。最后,对刚柔结合的充气结构进行了动态特征拓扑优化,有力地证明了所提出的拓扑优化方法的有效性和效率,即最大化充气结构的第一个特征频率和两个连续特征频率之间的间隙。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Topology optimization for eigenfrequencies of a flexible multibody system

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.

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来源期刊
CiteScore
6.00
自引率
17.60%
发文量
46
审稿时长
12 months
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.
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