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Modelisation et optimisation des performances acoustiques d'un tablier d' automobile en alliage de magnesium.

机译:镁合金汽车围裙的声学性能建模和优化。

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摘要

This work is part of the MFERD (Magnesium Front End Research and Development) project which goal is to develop enabling technologies for the use of magnesium alloys as a principal structural material for cars (mainly made in steel which is four time heavier than magnesium) in order to reduce their mass for both, environmental and security concerns. In this work we have focused on the acoustic part, in the case of a magnesium alloy dash panel. The dash board, by separating the engine compartment from the interior cabin, plays a critical role in the insulation of the car interior. Since the acoustic comfort inside the car has become a marketing argument of great importance, the passage from steel to magnesium dash panel should not deteriorate acoustic performances. In this work, we first conducted a literature review on the types of acoustic treatments used in the automotive industry as well as various techniques of their modeling. We then compared the acoustic performances of a Mg dash with attached traditional acoustic treatments (single-layer, two layers and three layers) to those of a steel and aluminum dash panels with the same mass density, stiffness and/or frequency of resonances. Finally, we optimized different concepts of innovative sound packages applied on the Mg dash panel to achieve a noise performance similar or superior to those of a conventional steel dash. The optimization was done using a SEA (Statitical Energy Analysis) model, coupled with an optimization code based on a genetic algorithm.;Key words: Sound packages, Magnesium alloy automotive dash panel, Statistical Energy Analysis (SEA), Optimization, Genetic algorithm.
机译:这项工作是MFERD(镁前端研究与开发)项目的一部分,该项目的目的是开发将镁合金用作汽车主要结构材料(主要由钢制成,比镁重四倍)的使能技术。为了减少环境和安全方面的顾虑。在这项工作中,我们将重点放在声学部分,例如镁合金仪表板。仪表板通过将发动机舱与车厢分隔开来,在汽车内部的隔热中起着至关重要的作用。由于汽车内部的声音舒适性已成为市场上非常重要的争论,因此从钢质面板到镁质仪表板的过渡不会影响声学性能。在这项工作中,我们首先对汽车工业中使用的声学处理类型及其建模的各种技术进行了文献综述。然后,我们将具有附加的传统声学处理(单层,两层和三层)的Mg仪表板的声学性能与具有相同质量密度,刚度和/或共振频率的钢和铝仪表板的声学性能进行了比较。最后,我们优化了在Mg仪表板上应用的创新声音套件的不同概念,以实现与传统钢制仪表板相似或更高的噪声性能。使用SEA(静态能量分析)模型进行优化,并结合基于遗传算法的优化代码。关键词:隔音包装,镁合金汽车仪表板,统计能量分析(SEA),优化,遗传算法。

著录项

  • 作者

    Sy, Djibril.;

  • 作者单位

    Universite de Sherbrooke (Canada).;

  • 授予单位 Universite de Sherbrooke (Canada).;
  • 学科 Applied Mechanics.;Engineering Mechanical.;Engineering Automotive.
  • 学位 M.Sc.A.
  • 年度 2010
  • 页码 105 p.
  • 总页数 105
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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