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The inner-dash sound insulation pad is an important part of the automobile firewall assembly. This paper studies the influence of different sound insulation pad materials, coverage rate, thickness distribution of soft layer and installation process characteristics of accessories on the sound insulation performance of the firewall assembly. The sound insulation performance of the firewall assembly of a vehicle model is optimized and improved through selecting appropriate material composition and soft layer thickness, improving the coverage rate of the sound insulation pad, and reducing the leakage amount.
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前围内隔音垫是汽车防火墙总成的重要隔音部件,研究了不同的前围内隔音垫材料、覆盖率、软层厚度分布、过孔本体隔声、附件安装工艺特征等对防火墙总成隔声性能的影响。通过选取合适的材料组成及软层厚度、提高隔音垫覆盖率、提高过孔本体隔声、降低泄漏量等手段实现对某车型防火墙总成隔声性能的优化改进。
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刘秀影(1984—),女,高级工程师,硕士学位,研究方向为汽车NVH声学包及风噪性能开发。
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刘秀影(1984—),女,高级工程师,硕士学位,研究方向为汽车NVH声学包及风噪性能开发。
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| 厚度/mm | 5 | 10 | 15 | 20 | 25 |
| 占比/% | 1# | 10 | 20 | 20 | 30 | 20 |
| 2# | 10 | 10 | 20 | 35 | 25 |
| 3# | 10 | 10 | 22 | 32 | 21 |
| 4# | 5 | 21 | 21 | 32 | 21 |
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不同厚度分布
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| 厚度/mm | 5 | 10 | 15 | 20 | 25 |
| 占比/% | 1# | 10 | 20 | 20 | 30 | 20 |
| 2# | 10 | 10 | 20 | 35 | 25 |
| 3# | 10 | 10 | 22 | 32 | 21 |
| 4# | 5 | 21 | 21 | 32 | 21 |
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| 编号 | 部件 | 问题点及原因分析 | 优化方案 |
| 1 | 左线束过孔 | a.左线束过孔安装后贴合不严,存在泄漏; b.线束与覆盖过孔前围存在空腔,难以起到有效隔声作用; c.线束过孔厚度不足,自身隔声薄弱 | a.建议采用右线束过孔的十字开孔方式; b.保证前围过孔处PU软层厚度不低于5 mm,且与线束贴合; c.检查数模中线束过孔过盈量,提升安装槽内凸台高度 |
| 2 | 右线束过孔 | a.左线束过孔安装后贴合不严,存在泄漏; b.线束与覆盖过孔前围存在空腔,难以有效隔声 | a.保证前围过孔处PU软层厚度不低于5 mm,且与线束贴合; b.检查数模中线束过孔过盈量,提升安装槽内凸台高度 |
| 3 | 离合踏板支架 | a.离合过孔和螺栓孔安装后贴合不严,存在泄漏; b.安装区域PU厚度不足; c.安装区域存在钣金裸露 | a.改变离合过孔安装方式,增加橡胶垫,采用过盈设计; b.增加安装凸台,过孔及螺栓安装孔区域的软层厚度不低于5 mm; c.优化前围开孔,减小开孔面积 |
| 4 | 换挡拉线过孔 | 换挡拉线与覆盖过孔前围存在空腔,难以有效隔声 | 增加前围过孔在此处PU软层厚度(5 mm以上),确保与换挡拉线贴合 |
), ArticleFig(id=1195335916177900360, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1195319925414863038, language=CN, label=表2, caption=
典型优化方案
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| 编号 | 部件 | 问题点及原因分析 | 优化方案 |
| 1 | 左线束过孔 | a.左线束过孔安装后贴合不严,存在泄漏; b.线束与覆盖过孔前围存在空腔,难以起到有效隔声作用; c.线束过孔厚度不足,自身隔声薄弱 | a.建议采用右线束过孔的十字开孔方式; b.保证前围过孔处PU软层厚度不低于5 mm,且与线束贴合; c.检查数模中线束过孔过盈量,提升安装槽内凸台高度 |
| 2 | 右线束过孔 | a.左线束过孔安装后贴合不严,存在泄漏; b.线束与覆盖过孔前围存在空腔,难以有效隔声 | a.保证前围过孔处PU软层厚度不低于5 mm,且与线束贴合; b.检查数模中线束过孔过盈量,提升安装槽内凸台高度 |
| 3 | 离合踏板支架 | a.离合过孔和螺栓孔安装后贴合不严,存在泄漏; b.安装区域PU厚度不足; c.安装区域存在钣金裸露 | a.改变离合过孔安装方式,增加橡胶垫,采用过盈设计; b.增加安装凸台,过孔及螺栓安装孔区域的软层厚度不低于5 mm; c.优化前围开孔,减小开孔面积 |
| 4 | 换挡拉线过孔 | 换挡拉线与覆盖过孔前围存在空腔,难以有效隔声 | 增加前围过孔在此处PU软层厚度(5 mm以上),确保与换挡拉线贴合 |
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