• CN:11-2187/TH
  • ISSN:0577-6686

›› 2014, Vol. 50 ›› Issue (18): 23-28.

• 论文 • 上一篇    下一篇

基于宽频激励的管型结构导波检测

邓菲,陈洪磊,张僖   

  1. 宁波工程学院电子与信息工程学院;上海应用技术学院电气与电子工程学院
  • 发布日期:2014-09-20

Law of Rolling Contact Fatigue Life of Thermal Spray Coatings:A review

CHEN Shuying;WANG Haidou;XU Binshi;KANG Jiajie   

  1. National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering
  • Published:2014-09-20

摘要: 在对管型结构的导波检测过程中,需要预先选定导波模态,并确定激励频率,这个选择的过程存在一定的盲目性,而在多次反复试验中确定最佳激励模态和频率也会带来精力、时间、硬件资源的耗费问题。介绍一种信号处理方法,在宽频信号作为激励产生响应的基础上,采用该算法可获得其频带范围内任意单频激励信号对应的响应,有效解决了预先选定模态及频率的问题。同时,引入时频分析技术,根据缺陷反射回波能量的分布情况快速确定具有低模态转换响应的导波频率区间。通过对比各频率计算结果的模态和缺陷反射信号幅值,发现缺陷管中理想的激励导波频率在140~180 kHz,且缺陷反射回波幅值随激励信号周期增加而增加,但这种特点在低频表现得不明显。这为根据管中缺陷大小及类型,选择不同激励频率和周期提供了理论依据。

关键词: 导波;宽频激励;管;时频分析;缺陷检测

Abstract: Rolling contact fatigue(RCF) life is an important criterion for evaluating the quality of thermal spray coatings. At present, mainly three methods are used to study the law of RCF life, i.e. theory model method(TMM), fatigue testing method(FTM), finite element method(FEM). The TMM emphasizes the description of the failure mechanism, and it predicts thermal spray coating life through formula derived by classical theories and parameters measured by RCF test. The FTM attaches importance to the analysis of the fatigue data, which establishes relationships between RCF life and different factors by using Weibull distribution to analyse the statistics obtained from RCF tester. The FEM analyses needed parameters scientifically by using computer software to simulate the real working condition of thermal spray coatings. It is a supplement of the two methods above. The achievements of the three different methods are summarized. The study status of law of RCF life both at home and abroad is also summarized. The combination of FTM and FEM is recognized as the best method to predict the RCF life.

Key words: thermal spray coating;rolling contact fatigue;life prediction

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