時間：2015年1月6日，上午10:00

地點：1號樓232會議室

報告題目：結構健康監測中超聲導波的高級模擬與仿真技術

Advanced Modeling Techniques for the Simulation of Ultrasonic Guided Waves in Structural Health Monitoring

 

個人簡介：申巖峰博士，現任美國密歇根大學航空航天系，Active Aeroelasticity and Structures Research Laboratory (A2SRL)實驗室博士后研究員。2010 年至2014年，在南卡羅來納大學Laboratory for Active Materials and Smart Structures (LAMSS) 實驗室工作，并獲得機械工程博士學位。多年從事結構健康監測，智能材料結構，超聲導波主動傳感，非線性超聲，以及超聲導波高級仿真技術等研究。發表學術論文20余篇，國際會議報告10余次。多次受到Smart Materials and Structures, Structural Health Monitoring, Wave Motion, Sensors, Journal of Civil Structural Health Monitoring, Construction and Building Materials等世界著名期刊邀請，承擔審稿工作。

　　本次報告將首先介紹結構健康監測的基本概念，包括導波，壓電片狀主動傳感器，和主動傳感方法。報告的主體部分闡述結構健康檢測中超聲導波的高級模擬與仿真技術。其中涉及線性和非線性超聲的模擬。在線性超聲模擬技術中，三種有效仿真方法將被一一介紹：（1）蘭姆波的無反射邊界應用；（2）解析解與有限元結合法；（3）利用CUDA技術實現超聲LISA模擬的并行計算。在非線性超聲模擬技術中，兩種模擬接觸非線性的有效方法將被介紹：（1）單元生死法；（2）接觸分析方法。

This report will first address the fundamental concepts of structural health monitoring (SHM), including guided waves, piezoelectric wafer active sensors (PWAS), and active sensing methods. The main body of the report presents advanced modeling techniques for the simulation of ultrasonic guided waves in SHM. The simulation of both linear and nonlinear ultrasonics will be discussed. In the linear ultrasonics part, three useful techniques will be introduced: (1) non-reflective boundary condition for Lamb waves; (2) combined analytical/FEM approach (CAFA); (3) GPU parallelized implementation of local interaction simulation approach (LISA) using compute unified design architecture (CUDA). In the nonlinear ultrasonics part, two methods were used to model the contact acoustic nonlinearity (CAN): (1) element activation/deactivation approach; (2) contact analysis. This report finishes with conclusions and suggestions for future work.