电子设计工程
電子設計工程
전자설계공정
ELECTRONIC DESIGN ENGINEERING
2015年
16期
15-18
,共4页
有限时域差分法仿真%耦合效应%超声检测
有限時域差分法倣真%耦閤效應%超聲檢測
유한시역차분법방진%우합효응%초성검측
FDTD simulation%coupling effect%ultrasonic detection
基于提高小尺寸复杂结构零件的超声检测的精确性的目的，采用时域有限差分法，分别建立了带有一个和3个圆形空腔的铝板模型，研究了不同铝板宽度下结构耦合对超声传播的影响。研究结果表明，对于两种结构的铝板，当宽度小于8个波长（20 mm）时，超声通过空腔的透射功率明显增大，其最高相对变化分别为10.5倍和6倍左右。这说明当铝板宽度与波长可比拟时，空腔与铝板之间有明显的耦合效应，且空腔的增加削弱了这种耦合效应，使得铝板宽度变化对超声传播的影响减弱。
基于提高小呎吋複雜結構零件的超聲檢測的精確性的目的，採用時域有限差分法，分彆建立瞭帶有一箇和3箇圓形空腔的鋁闆模型，研究瞭不同鋁闆寬度下結構耦閤對超聲傳播的影響。研究結果錶明，對于兩種結構的鋁闆，噹寬度小于8箇波長（20 mm）時，超聲通過空腔的透射功率明顯增大，其最高相對變化分彆為10.5倍和6倍左右。這說明噹鋁闆寬度與波長可比擬時，空腔與鋁闆之間有明顯的耦閤效應，且空腔的增加削弱瞭這種耦閤效應，使得鋁闆寬度變化對超聲傳播的影響減弱。
기우제고소척촌복잡결구령건적초성검측적정학성적목적，채용시역유한차분법，분별건립료대유일개화3개원형공강적려판모형，연구료불동려판관도하결구우합대초성전파적영향。연구결과표명，대우량충결구적려판，당관도소우8개파장（20 mm）시，초성통과공강적투사공솔명현증대，기최고상대변화분별위10.5배화6배좌우。저설명당려판관도여파장가비의시，공강여려판지간유명현적우합효응，차공강적증가삭약료저충우합효응，사득려판관도변화대초성전파적영향감약。
To improve the accuracy when conducting ultrasonic detection for small-sized and complex-structure elements, two aluminum plate models with one cavity and three cavities were established and the structure coupling impacts on ultrasonic transmission under different sample sizes were analyzed by the finite-difference time-domain method (FDTD). The results show that for the two plates, the transmitted ultrasonic power through the cavities increases obviously when the width is less than 8 times (20 mm) of the ultrasonic wavelength, and its maximum relative change is up to 10.5 times and 6 times, respectively. This shows that, the coupling effect between cavity and aluminum plate is strong when the width is a few wavelengths. Also, the adding of the cavities will weaken the coupling effect, and the effect of size change on ultrasonic transmission properties will decrease.
