In this paper, we investigate the elastic wave full-waveform inversion (FWI) based on the trust region method. The FWI is an optimization problem of minimizing the misfit between the observed data and simulated data. ...In this paper, we investigate the elastic wave full-waveform inversion (FWI) based on the trust region method. The FWI is an optimization problem of minimizing the misfit between the observed data and simulated data. Usually</span><span style="font-family:"">,</span><span style="font-family:""> the line search method is used to update the model parameters iteratively. The line search method generates a search direction first and then finds a suitable step length along the direction. In the trust region method, it defines a trial step length within a certain neighborhood of the current iterate point and then solves a trust region subproblem. The theoretical methods for the trust region FWI with the Newton type method are described. The algorithms for the truncated Newton method with the line search strategy and for the Gauss-Newton method with the trust region strategy are presented. Numerical computations of FWI for the Marmousi model by the L-BFGS method, the Gauss-Newton method and the truncated Newton method are completed. The comparisons between the line search strategy and the trust region strategy are given and show that the trust region method is more efficient than the line search method and both the Gauss-Newton and truncated Newton methods are more accurate than the L-BFGS method.展开更多
大量无序接入的电动汽车会对电网产生巨大的影响。电动汽车,尤其是具有V2G(Vehicle to Grid)功能的电动汽车将会成为智能电网的重要组成部分,一方面能够减小随机充电负荷对电网的冲击,另一方面,电动汽车的移动储能特性又会为可再生能源...大量无序接入的电动汽车会对电网产生巨大的影响。电动汽车,尤其是具有V2G(Vehicle to Grid)功能的电动汽车将会成为智能电网的重要组成部分,一方面能够减小随机充电负荷对电网的冲击,另一方面,电动汽车的移动储能特性又会为可再生能源协调发展提供平台。介绍了近几年电动汽车与电网互动在协调控制策略方面的研究成果,并对电动汽车参与电网互动的控制策略提出了建议。展开更多
文摘In this paper, we investigate the elastic wave full-waveform inversion (FWI) based on the trust region method. The FWI is an optimization problem of minimizing the misfit between the observed data and simulated data. Usually</span><span style="font-family:"">,</span><span style="font-family:""> the line search method is used to update the model parameters iteratively. The line search method generates a search direction first and then finds a suitable step length along the direction. In the trust region method, it defines a trial step length within a certain neighborhood of the current iterate point and then solves a trust region subproblem. The theoretical methods for the trust region FWI with the Newton type method are described. The algorithms for the truncated Newton method with the line search strategy and for the Gauss-Newton method with the trust region strategy are presented. Numerical computations of FWI for the Marmousi model by the L-BFGS method, the Gauss-Newton method and the truncated Newton method are completed. The comparisons between the line search strategy and the trust region strategy are given and show that the trust region method is more efficient than the line search method and both the Gauss-Newton and truncated Newton methods are more accurate than the L-BFGS method.
文摘大量无序接入的电动汽车会对电网产生巨大的影响。电动汽车,尤其是具有V2G(Vehicle to Grid)功能的电动汽车将会成为智能电网的重要组成部分,一方面能够减小随机充电负荷对电网的冲击,另一方面,电动汽车的移动储能特性又会为可再生能源协调发展提供平台。介绍了近几年电动汽车与电网互动在协调控制策略方面的研究成果,并对电动汽车参与电网互动的控制策略提出了建议。
