Numerical analyses for the nonlinear evolutions of stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) processes are given. Various effects of the second- and third-order nonlinear susceptibili...Numerical analyses for the nonlinear evolutions of stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) processes are given. Various effects of the second- and third-order nonlinear susceptibilities on the SRS and SBS processes are studied. The nonlinear evolutions of SRS and SBS processes are atfected more efficiently than their linear growth rates by the nonlinear susceptibility.展开更多
Optimal detection of liquid ionization calorimeter signal in experimental particle physics is considered. A few linear and nonlinear approaches for amplitude and arrival time estimation based on the χ2 function are c...Optimal detection of liquid ionization calorimeter signal in experimental particle physics is considered. A few linear and nonlinear approaches for amplitude and arrival time estimation based on the χ2 function are compared in simulation considering the noise sample correlation introduced by the analog pulse shaper. The estimation bias of the first-order approximation, a.k.a linear optimal filtering, is studied and contrasted to those of the second-order as well as the exhaustive search. A gradient-descent technique is presented as an alternative to the exhaustive search with significantly reduced search time and computation complexity. Results from various pulse shapers including the CR-RC2, CR-RC3, and CR2-RC2 are also compared.展开更多
Grid-connected converters(GPC)are playing an increasingly important role in distribution networks.Performing electromagnetic transient(EMT)simulations on power electronics and distribution networks can significantly i...Grid-connected converters(GPC)are playing an increasingly important role in distribution networks.Performing electromagnetic transient(EMT)simulations on power electronics and distribution networks can significantly improve the analysis accuracy.However,the existing simulation softwarestruggles to handle distribution networks with a large number of power electronic switches,leading to unacceptable simulation times.To address this issue,a system-hierarchical multi-rate co-simulation framework is proposed.The system is hierarchically divided into different rate subsystems based on timescales,and solvers withdifferent simulation rates are used to solve them separately.A Taylor-series-based variable-step solver is proposed for power electronic systems,and numerical compensation algorithms are designed for multi-rate interfaces to improve the system stabilityand accuracy.Compared with commercial software,the proposed framework increased the simulation speed by more than 200 times in the studied case,involving 576 switching devices and 14 bus distribution networks,while contributing less than 1%to the relativeerror.展开更多
基金Supported by the National High-Tech ICF Commit tee of China.
文摘Numerical analyses for the nonlinear evolutions of stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) processes are given. Various effects of the second- and third-order nonlinear susceptibilities on the SRS and SBS processes are studied. The nonlinear evolutions of SRS and SBS processes are atfected more efficiently than their linear growth rates by the nonlinear susceptibility.
文摘Optimal detection of liquid ionization calorimeter signal in experimental particle physics is considered. A few linear and nonlinear approaches for amplitude and arrival time estimation based on the χ2 function are compared in simulation considering the noise sample correlation introduced by the analog pulse shaper. The estimation bias of the first-order approximation, a.k.a linear optimal filtering, is studied and contrasted to those of the second-order as well as the exhaustive search. A gradient-descent technique is presented as an alternative to the exhaustive search with significantly reduced search time and computation complexity. Results from various pulse shapers including the CR-RC2, CR-RC3, and CR2-RC2 are also compared.
基金Supported by the National Key Research and Development Program(2023YFB3307000).
文摘Grid-connected converters(GPC)are playing an increasingly important role in distribution networks.Performing electromagnetic transient(EMT)simulations on power electronics and distribution networks can significantly improve the analysis accuracy.However,the existing simulation softwarestruggles to handle distribution networks with a large number of power electronic switches,leading to unacceptable simulation times.To address this issue,a system-hierarchical multi-rate co-simulation framework is proposed.The system is hierarchically divided into different rate subsystems based on timescales,and solvers withdifferent simulation rates are used to solve them separately.A Taylor-series-based variable-step solver is proposed for power electronic systems,and numerical compensation algorithms are designed for multi-rate interfaces to improve the system stabilityand accuracy.Compared with commercial software,the proposed framework increased the simulation speed by more than 200 times in the studied case,involving 576 switching devices and 14 bus distribution networks,while contributing less than 1%to the relativeerror.
