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《中国工程科学》 >> 2014年 第16卷 第8期

搅拌摩擦焊镁合金隔声性能的研究

1. 福建工程学院机械与汽车工程学院,福州 350118;

2. 南京理工大学机械工程学院,南京 210094

资助项目 :国家863 计划项目(2012AA1111050);福建省科技计划重点项目(2013H0001);福州市科技计划项目(2012-G-108,2013-G-90);福建省汽车电子与电驱动技术重点实验室开放基金(ZDKA1301) 收稿日期: 2013-11-15 发布日期: 2014-08-13 14:20:47.000

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摘要

伴随搅拌摩擦焊在镁合金上的广泛应用,对其隔声特性研究尤为重要,基于自适应网格技术,对搅拌摩擦焊过程进行数值模拟,为后续声学计算提供约束模态,解决了材料属性难以确定的问题,一定程度上实现了焊接与声学的结合。自行设计和制造了混响箱,用以测量焊接镁合金板的隔声量,弥补了混响室测试小试件的不足。进而使用finite element-statistical energy analysis(FE-SEA)混合法计算焊接件的隔声量,与试验结果进行对比,吻合良好,表明此方法行之有效。通过对比焊接前后镁合金板件的隔声量,发现在吻合低谷区,焊接后板件的隔声有所降低。为了研究焊接参数对隔声的影响,分别改变焊接速度和搅拌头旋转速度,观察隔声量的变化,结果表明,这些参数都需要合理的设置,并非越大或者越小越好。

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