源点附近弹性波场的时域有限差分模拟与数据校正  

FDTD simulation to the elastic field nearby the source region and its data adjustment

作　　者：刘伟[1] 张义德[2] 

机构地区：[1]华北电力大学数理系,保定071003 [2]哈尔滨工业大学航天科学与力学系,哈尔滨150001

出　　处：《黑龙江大学自然科学学报》2011年第3期348-351,359,共5页Journal of Natural Science of Heilongjiang University

基　　金：黑龙江省青年科学基金资助项目(QC2010025);高校博士点新教师基金资助项目(20102302120024)

摘　　要：用时域有限差分法进行弹性波数值模拟,在源点附近区域的结果通常都不理想。运用时域有限差分法模拟二维点源辐射的问题进行了分析,发现源点附近出现波至时间与预期不符,对时域有限差分法自身特点进的分析表明,这是时域有限差分法难以克服的缺陷,但可以运用反向逆推对此区域的模拟结果进行校正。最后利用修正的数据对水平界面模型进行反演,取得了满意的效果。FDTD usually have a bad result in the source region.A two-dimension point-source FDTD simulation had been completed.After an analysis with the data nearby the source,some results were gained.In the source region,for FDTD＇s own characteristic,reflect waves reaching time doesn＇t agree with its expectation.But the data can be corrected by counter deduction.At last,a level interface inversion was done by using the corrected data and a good result was obtained.

关 键 词：弹性波 源点 时域有限差分 

分 类 号：O421[理学—声学]