煤田地质与勘探
煤田地質與勘探
매전지질여감탐
COAL GEOLOGY & EXPLORATION
2013年
5期
80-83
,共4页
奇异值分解总体最小二乘法%非预测%欧拉反褶积%多源
奇異值分解總體最小二乘法%非預測%歐拉反褶積%多源
기이치분해총체최소이승법%비예측%구랍반습적%다원
SVD-TLS%unprescribed%Euler deconvolution%multiple-source
针对地下有多个异常源时,单一预测构造指数难于表征多个异常源。采用非预测欧拉反褶积以避免可能错误确定构造指数使得欧拉解过度发散的问题;同时针对欧拉反褶积超定方程组的条件数很大,致使欧拉反褶积解集中良解占优率低等解的非唯一性和解的不稳定性等局限性,采用奇异值分解总体最小二乘法(SVD-TLS 算法),以降低由于奇异值分析不当造成计算欧拉解非唯一性和解的不稳定性的问题,并利用SVD-TLS的截断误差构造阈值函数对解集进行过滤。数值结果表明了算法的有效性和可靠性。
針對地下有多箇異常源時,單一預測構造指數難于錶徵多箇異常源。採用非預測歐拉反褶積以避免可能錯誤確定構造指數使得歐拉解過度髮散的問題;同時針對歐拉反褶積超定方程組的條件數很大,緻使歐拉反褶積解集中良解佔優率低等解的非唯一性和解的不穩定性等跼限性,採用奇異值分解總體最小二乘法(SVD-TLS 算法),以降低由于奇異值分析不噹造成計算歐拉解非唯一性和解的不穩定性的問題,併利用SVD-TLS的截斷誤差構造閾值函數對解集進行過濾。數值結果錶明瞭算法的有效性和可靠性。
침대지하유다개이상원시,단일예측구조지수난우표정다개이상원。채용비예측구랍반습적이피면가능착오학정구조지수사득구랍해과도발산적문제;동시침대구랍반습적초정방정조적조건수흔대,치사구랍반습적해집중량해점우솔저등해적비유일성화해적불은정성등국한성,채용기이치분해총체최소이승법(SVD-TLS 산법),이강저유우기이치분석불당조성계산구랍해비유일성화해적불은정성적문제,병이용SVD-TLS적절단오차구조역치함수대해집진행과려。수치결과표명료산법적유효성화가고성。
It is difficult to characterize complicated anomaly sources with the single prescribed structure index and to determine structural index when these types of causative sources are unknown, and solutions of Euler deconvo-lution with divergent trend caused by error set or wrongly estimated structural index. Pathological equations of Euler deconvolution results in good solution. In this paper, we use SVD-TLS algorithm to reduce instability and non-uniqueness of Euler solution due to improper singular value analysis, then use truncation error of SVD-TLS to construct threshold function to filter the erroneous solutions. The proposed method is verified by one numerical example and results show that the approach is effective.