铸铁复合材料的阻尼特性.pdfVIP

学兔兔 Apr．2010 VoI．59 NO．4 一 ^ ^^ ‘^ ■ -、●“■ ^ {复合材料 } ’ ●、 ■ ■ ●●v■ ■、，■^■～‘■- 三维连续网络结构碳化硅膳铁复合材料的阻尼特性 冯胜山，王泽建，刘庆丰 (湖北工业大学机电研究设计院，湖北武汉430070) 摘要：采用常压铸渗成形工艺制备了一种新型的三维连续网络结构碳化硅／铸铁复合材料，用模态分析法对比测试了在 不同支承状态下复合材料与普通灰铸铁材料的阻尼比、脉冲响应时14历程和传递函数，探讨了复合材料的减振机理。结 果表明：复合材料的阻尼比比普通灰铸铁材料有较大幅度提高；在两点刚性支承状态下，复合材料的振幅衰减比灰铸铁 试样振幅衰减更迅速，第一阶阻尼比为灰铸铁的2_3倍，频响函数幅值 (噪声分贝)比灰铸铁降低3．23dB，减振效果明显。 关键词：三维网络；碳化硅；铸铁；复合材料；阻尼 中图分类号：TB33；TG143 文献标识码：A 文章编号：1001-4977(2010)04—0358—05 Vibration．Absorption Characteristics of Three．Dimensional CO．Continuous Network SiC／Cast lr0n Composites FENG Sheng．shan，WANG Ze-jian，LIU Qing—feng (ResearchDesign Institute of Mechanical＆Electronic Engineering，Hubei University of Technology，Wuhan 430070，Hubei，China J Abstract： The infiltration casting method is applied to the preparation of three—dimensional CO—continuous network SiC／cast iron composite material in atmospheric pressure．By using of modaI analysis method，ordinary gray iron and composite specimens are compared about damping ratio， pulse．response—time course and transfer function in different suppoaing state．The damping mechanism of composite material was discussed．The result shows that the damping ratio of composite material is increased by a big margin，compared with that of gray iron．SuppoSed in two rigid points。state．the amplitude attenuation of composite material jS more quickly than that of gray iron specime