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Shape optimization, model updating and empirical modeling applied to the design synthesis of a heavy truck side guard

机译:形状优化,模型更新和经验建模应用于重型卡车侧护板的设计综合

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摘要

This work describes the use of different optimization approaches aiming at the automatic design synthesis of a heavy truck side guard (bumper). At a preliminary stage, an existing version of the side guard undergoes a geometrical simplification in order to improve manufacturability and assemblability aspects of the design. This geometrical simplification is achieved through a fully automatic shape optimization procedure, taking into account that key mechanical features of the original configuration are to be kept in the simplified design. In the sequence, the numerical model of the simplified version of the bumper is updated to match the experimental results obtained through modal testing of a prototype in laboratory conditions. For comparison purposes, two automatic optimization techniques are used in the modal matching procedure. After achieving the desired configuration changes (by means of shape optimization) and a reliable model representing the system's behaviour (by means of the modal matching procedure), the design of the heavy truck side bumper is improved, again by using an automatic approach based on numerical optimization techniques. The purpose of this optimization procedure is to tune the natural vibrating frequencies of the side bumper so that its behaviour with respect to noise, vibration and harshness reaches predefined performance levels. Aiming at future design improvement, to be held in a multidisciplinary context that accounts for crashworthiness issues, empirical models (nonlinear response surfaces) are developed for the implementation of such optimization procedure. Finally, the general conclusions and perspectives for future research work are presented, stressing at the usefulness of numerical optimization techniques in supporting the automation of an entire design procedure, from conceptual definition to multidisciplinary performance improvement. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 30]
机译:这项工作描述了针对重型卡车侧护板(保险杠)的自动设计综合的不同优化方法的使用。在初期阶段,现有版本的侧挡板经过几何简化,以改善设计的可制造性和可组装性。考虑到原始配置的关键机械特征必须保留在简化的设计中,因此可以通过全自动的形状优化程序来实现这种几何简化。在此序列中,保险杠的简化版本的数值模型将更新,以匹配通过在实验室条件下对原型进行模态测试而获得的实验结果。为了比较,在模态匹配过程中使用了两种自动优化技术。在实现所需的配置更改(通过形状优化)和代表系统行为的可靠模型(通过模态匹配程序)之后,再次使用基于以下方面的自动方法改进了重型卡车侧保险杠的设计:数值优化技术。此优化过程的目的是调整侧保险杠的固有振动频率,以使其在噪音,振动和粗糙度方面的行为达到预定的性能水平。为了解决未来的设计改进(要在多学科环境中解决可撞性问题),开发了经验模型(非线性响应面)来实施这种优化程序。最后,提出了未来研究工作的一般结论和观点,强调了数值优化技术在支持从概念定义到多学科性能改进的整个设计过程自动化中的作用。 (C)2002 Elsevier ScienceLtd。保留所有权利。 [参考:30]

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