自由衰减曲线的全谱拟合及其在高精度内耗测量中的应用  

Full Spectrum Refinement of Free Decay Curve and Its Application in High Resolution Internal Friction Measurement

作　　者：王先平[1] 胡菁[1] 庄重[1] 郭丽君[1] 程帜军[1] 张涛[1] 方前锋[1] 

机构地区：[1]中国科学院固体物理研究所,合肥230031

出　　处：《理化检验（物理分册）》2011年第7期399-402,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：国家自然科学基金项目(10874185);中科院知识创新工程重要方向项目(KJCX2-YW-N35)

摘　　要：基于Bevington方法对自由衰减曲线进行全谱拟合,并应用于多功能内耗仪自由衰减模式下的高精度内耗测量中。内耗稳定性研究表明:采用该方法测量精度可达±7×10-6,比振幅法提高近一个量级。特别是在高阻尼情况下,全谱拟合方法得到的内耗测量值精确度相对较高。Based on Bevington method, nonlinear full spectrum refinement of free decay curve was realized. Stability of the high resolution internal friction measurement under free decay mode of multi-function internal friction apparatus obtained by using the method can be up to ± 7 × 10^-6 , which is almost one order of magnitude higher than that of linear amplitude fitting method. Especially, the better precision can be achieved via full spectrum fitting method in the case of high measurement damping.

关 键 词：自由衰减曲线 全谱拟合 内耗 

分 类 号：TG115.24[金属学及工艺—物理冶金]