THE MULTIRESOLUTION ANALYSIS FOR ULTRASONIC NON DESTRUCTIVE EVALUATION
Acoustical characterization is an important item in materials testing and takes an increasing place during the fabrication and the in service inspection processes. Indeed, ultrasonic techniques have been commonly used in power and petrochemical industries for nearly 50 years and the often used technique is the echo-graphic in which the waves reflected by the material structures are observed and analyzed. Since, the performance of ultrasonic techniques are often affected by the physical structure of the component and by background noise, the effects of aging and environment on failure mechanisms cannot be sufficiently predicted by the traditional methods. However computational modelling of materials behaviour is becoming a reliable tool to emphasize scientific investigations and to match up theoretical and experimental approaches. With the continuous progress in computational power new ultrasonic testing systems are expected to be discovered and implemented. This requires not only development of improved processing techniques but also a better understanding of material structure. These conditions implicate multiple length scales analysis and multiple implementation steps, which are available only by means of simulation models. Therefore, increasing efforts are focused on ultrasonic multiscale modelling methods for signal interpretation; the multi-resolution models are the mainly investigated approaches. In this work a multiresolution ultrasonic signal analysis is accomplished and an enhanced energetic smoothing filtering algorithm is proposed for an advanced material behavior characterization.
Fairouz BETTAYEB
CSC, Research Centre On Welding And Control, Route de Dely Brahim Bp:36,Chéraga,16800 Algiers, Algeria
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
1182-1186
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）