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首页> 外文期刊>Mechanika >Lightweight Design of a Rear Axle Connection Bracket for a Heavy Commercial Vehicle by Using Topology Optimisation: A Case Study
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Lightweight Design of a Rear Axle Connection Bracket for a Heavy Commercial Vehicle by Using Topology Optimisation: A Case Study

机译：基于拓扑优化的重型商用车后桥连接支架的轻量化设计：一个案例研究

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An important design challenge of modern vehicles is mass reduction. Hence in many cases, mechanical design of vehicle components covers different optimization processes. One important structural optimization technique which is highly utilised in weight reduction applications is the topology optimization. This paper contains a multi-stage optimization based on the topology and design optimizations. During this study, the mechanical design of a rear axle-chassis connection bracket is achieved. First of all, the design load of the bracket was determined through a multibody dynamics analysis. This load case was determined among various driving conditions and the most critical load case was indicated as the design load of the bracket. This process was executed by using Adams/Car? software. Subsequently, a design volume for the bracket was decided, which specifies the domain of topology optimization that will be employed later on. The determination of the design domain was made by considering the structural position of the design component, the neighbor components of the rear axle and the chassis. In this manner, the basic shape and dimensions of the bracket were created. The unnecessary volume of the draft design, which is not properly loaded under the design conditions was determined and removed from the design by means of topology optimization. The topology optimization was run in topology optimization module of ANSYS? Workbench 18.2 finite element analysis (FEA) software package. In the light of the primary shape obtained from the topology optimization study, a producible initial design model was built. This model was then subjected to FE analysis under the same circumstances with the draft model, in order to perform strength and deformation assessments of the initial design. Correspondingly, the critical regions were determined where stress concentrations were observed. The model was updated in a way that the stress values were reduced in these regions through the response surface methodology (RSM). The comparisons between the result and the initial geometries reveal that the mass of the connection bracket was reduced by 63%. Besides, the total deformation which was dropped by the design optimization is 13% lower than the initial design that was generated with the influence of topology optimization result.
机译：现代车辆的一个重要设计挑战是减少质量。因此，在许多情况下，车辆部件的机械设计涵盖了不同的优化过程。在减轻重量的应用中高度利用的一项重要的结构优化技术是拓扑优化。本文包含基于拓扑和设计优化的多阶段优化。在这项研究中，实现了后桥底盘连接支架的机械设计。首先，通过多体动力学分析确定支架的设计载荷。该载荷工况是在各种驾驶条件下确定的，最关键的载荷工况表示为支架的设计载荷。通过使用Adams / Car执行此过程。软件。随后，确定了支架的设计量，该设计量指定了稍后将采用的拓扑优化领域。通过考虑设计部件的结构位置，后桥和底盘的相邻部件来确定设计范围。以这种方式，创建了支架的基本形状和尺寸。确定了设计中不必要的体积，该体积在设计条件下未正确加载，并通过拓扑优化将其从设计中删除。拓扑优化是在ANSYS的拓扑优化模块中运行的。 Workbench 18.2有限元分析（FEA）软件包。根据从拓扑优化研究中获得的主要形状，构建了可生产的初始设计模型。然后，在与草稿模型相同的情况下，对该模型进行有限元分析，以便对初始设计进行强度和变形评估。相应地，确定了观察到应力集中的关键区域。通过响应面方法（RSM）降低了这些区域的应力值，从而更新了模型。结果与初始几何形状之间的比较表明，连接支架的质量减少了63％。此外，设计优化降低的总变形比受拓扑优化结果影响而生成的初始设计低13％。

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