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Modeling effectiveness and identification of multi-scale objects in farmland soils with improved yee-fdtd methods

International Journal of Agricultural and Biological Engineering 2020年第6期13卷 150-158页

作者： Yuanhong Li Zuoxi Zhao Zhi Qiu Yangfan Luo Yuchan Zhu Department of Engineering South China Agricultural UniversityGuangzhou 510642China Southern Key Laboratory of Agricultural Equipment Machinery South China Agricultural UniversityGuangzhou 510642China Department of Biological and Agricultural Engineering Texas A&M UniversityCollege StationTX77843USA

Finite-Difference Time-Domain(fdtd)is the most popular time-domain approach in computational *** to the Courant-Friedrich-Levy(CFL)condition and the perfect match layer(PML)boundary precision,fdtd cannot simulate soil medium whose surface is connected by multiple straight lines or curves(multi-scale)accurately and efficiently,which greatly limits the application of fdtd method to simulate buried objects in ***,this study proposed the absorption boundary and adopted two typical perfect matching layers(UPML and CPML)to compare their absorption effects,and then using the three forms of improved yee-fdtd algorithm,alternating-direction implicit(ADI-fdtd),unconditionally stable(US-fdtd)and hybrid implicit explicit finite time-domain(HIE-fdtd)to divide and contrast the boundary model *** showed that the HIE-fdtd was suitable for inversion of multi-scale structure object modeling,while ADI-fdtd and US-fdtd were ideal for single-boundary objects in both uniaxial perfectly matched layer(UMPL)and convolution perfectly matched layer(CPML)finite element *** that,all the models were tested by computer performance for their simulated *** simulating single boundary objects,UPML-US-fdtd and ADI-fdtd could achieve the ideal results,and in the boundary inversion of multi-scale objects,HIE-fdtd modeling results and efficiency were the *** modeling speeds of CPML-HIE-fdtd were compared with three kinds of waveform sources,Ricker,Blackman-Harris and ***,under the computer condition in which the CPU was i5-8250,the HIE-fdtd model still had better performance than the traditional yee-fdtd forward modeling *** modeling multi-scale objects in farmland soils,the methods used CPML combined with the HIE-fdtd were the most efficient and accurate *** study can solve the problem that the traditional fdtd algorithm cannot construct non-mesh objects by utilizing the diversity characteristics of yee cell element

关键词： yee-fdtd multi-scale objects modeling effectiveness Ground Penetrating Radar farmland soils

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