关键词: 声发射, 模糊综合评价, 压力容器, 结构完整性

Abstract: According to the related stardards and references at home and abroad,some concepts of fuzzy describing and membership grade of the fuzzy mathematics,fist of all theory of multistage frzzy comprehensive assessment is use to consider the main detected information of active defects (AE source) and the experience of speciialists in the light of specific implications,a multistage fuzzy comprehensive assessment model and its methodology of severity of AE sources for pressure vessel in service are established.A computer software for mumerical analysis and processing is compliled to make the assessment result to tend to more reasonabal and reliable. An example of multistage fuzzy comprehesive assessment of AE source severity for spherical tank in service is given in the paper,the result of which shows that a quantitative level can be reached by the use of the assessment methodology,and meanwhile,it is in good accordance with the result acquired by nondestructive reexamination.

Key words: aeoustic emisson, fuzzy assessment, pressure vessel, structure integrity