Abstract
To solve such problems as sensitivity to noise and low accuracy of grain size evaluation using traditional ultrasonic time-domain attenuation method, an ultrasonic nondestructive evaluation model based on multiscale attenuation coefficient was proposed. The distribution of timescale of ultrasonic energy was obtained by means of wavelet transformation, then to calculate the distribution of attenuation coefficient with scale, and to make a comprehensive analysis of attenuation characteristics of various scales. After the weighted multi-scale ultrasonic attenuation coefficient was defined, a multi-scale ultrasonic attenuation evaluation model was established on the basis of combination of optimal dimension and normalized weight distribution strategy designed by particle swarm optimization. 304 stainless steel was used in the test. The distribution of attenuation coefficient with scale * 国家自然科学基金项目 61271356, 51205031和 51105045, 国家高技术研究发展计划项目 2012AA03A514, 湖南省自然科学基金项目 14JJ2002及中国博士后科学基金项目2014M562126资助 收到初稿日期: 2014-07-07,收到修改稿日期: 2014-09-25 作者简介:李雄兵,男, 1977年生,副教授 DOI: 10.11900/0412.1961.2014.00369 第121-128页 pp.121-128
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