介绍了复杂电阻率分布的机敏混凝土CFRC(C arbon F iber R e in forced Concrete)结构电阻率层析成像ERT(E lectrica l R es istance T om ography)FEM数值投影方法。结合VC和AN SY S的优点以及APDL程序生成技术,根据CFRC结构电阻率分...介绍了复杂电阻率分布的机敏混凝土CFRC(C arbon F iber R e in forced Concrete)结构电阻率层析成像ERT(E lectrica l R es istance T om ography)FEM数值投影方法。结合VC和AN SY S的优点以及APDL程序生成技术,根据CFRC结构电阻率分布图像和孔洞形式建立了各种ERT模型的FEM分析模型,进而获得它们的ERT数值投影数据。给出了2种复杂电阻率分布ERT模型的数值投影结果。展开更多
Irregular seismic data causes problems with multi-trace processing algorithms and degrades processing quality. We introduce the Projection onto Convex Sets （POCS） based image restoration method into the seismic data...Irregular seismic data causes problems with multi-trace processing algorithms and degrades processing quality. We introduce the Projection onto Convex Sets （POCS） based image restoration method into the seismic data reconstruction field to interpolate irregularly missing traces. For entire dead traces, we transfer the POCS iteration reconstruction process from the time to frequency domain to save computational cost because forward and reverse Fourier time transforms are not needed. In each iteration, the selection threshold parameter is important for reconstruction efficiency. In this paper, we designed two types of threshold models to reconstruct irregularly missing seismic data. The experimental results show that an exponential threshold can greatly reduce iterations and improve reconstruction efficiency compared to a linear threshold for the same reconstruction result. We also analyze the anti- noise and anti-alias ability of the POCS reconstruction method. Finally, theoretical model tests and real data examples indicate that the proposed method is efficient and applicable.展开更多
文摘介绍了复杂电阻率分布的机敏混凝土CFRC(C arbon F iber R e in forced Concrete)结构电阻率层析成像ERT(E lectrica l R es istance T om ography)FEM数值投影方法。结合VC和AN SY S的优点以及APDL程序生成技术,根据CFRC结构电阻率分布图像和孔洞形式建立了各种ERT模型的FEM分析模型,进而获得它们的ERT数值投影数据。给出了2种复杂电阻率分布ERT模型的数值投影结果。
基金financially supported by National 863 Program (Grants No.2006AA 09A 102-09)National Science and Technology of Major Projects ( Grants No.2008ZX0 5025-001-001)
文摘Irregular seismic data causes problems with multi-trace processing algorithms and degrades processing quality. We introduce the Projection onto Convex Sets （POCS） based image restoration method into the seismic data reconstruction field to interpolate irregularly missing traces. For entire dead traces, we transfer the POCS iteration reconstruction process from the time to frequency domain to save computational cost because forward and reverse Fourier time transforms are not needed. In each iteration, the selection threshold parameter is important for reconstruction efficiency. In this paper, we designed two types of threshold models to reconstruct irregularly missing seismic data. The experimental results show that an exponential threshold can greatly reduce iterations and improve reconstruction efficiency compared to a linear threshold for the same reconstruction result. We also analyze the anti- noise and anti-alias ability of the POCS reconstruction method. Finally, theoretical model tests and real data examples indicate that the proposed method is efficient and applicable.
