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航空发动机过渡态全局寻优控制方法研究 被引量:9
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作者 赵琳 樊丁 陕薇薇 《航空动力学报》 EI CAS CSCD 北大核心 2007年第7期1200-1203,共4页
为了对发动机的动态过程进行控制,提出了一种基于SQP的全局寻优控制方法.每一步寻优过程分为长程优化和短程优化两个阶段.根据长程优化结果,重构了关联目标函数,在此基础上,进行了短程优化修正,并利用修正结果进行控制.将这种方法应用... 为了对发动机的动态过程进行控制,提出了一种基于SQP的全局寻优控制方法.每一步寻优过程分为长程优化和短程优化两个阶段.根据长程优化结果,重构了关联目标函数,在此基础上,进行了短程优化修正,并利用修正结果进行控制.将这种方法应用于某型航空发动机的过渡态控制中,得到了理想的控制结果.仿真结果表明该方法能较好地解决一般局部优化方法在有纯延迟、模型失配等情况下的优化控制效果下降的问题. 展开更多
关键词 航空、航天推进系统 全局寻优控制 航空发动机 非线性系统 长程优化 优化
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Optimization of the imaginary time step evolution for the Dirac equation 被引量:1
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作者 LI FangQiong1,ZHANG Ying2,LIANG HaoZhao2,3 & MENG Jie4,2,5 1Guizhou University for Nationalities,Guiyang 550025,China 2State Key Lab Nuclear Physics & Technology,School of Physics,Peking University,Beijing 100871,China +2 位作者 3Institut de Physique Nucle’aire,IN2P3-CNRS and Universite’ Paris-Sud,F-91406 Orsay Cedex,France 4School of Physics and Nuclear Energy Engineering,Beihang University,Beijing 100191,China 5Department of Physics,University of Stellenbosch,Stellenbosch,South Africa 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第2期231-235,共5页
Taking the single neutron levels of 12C in the Fermi sea as examples,the optimization of the imaginary time step(ITS) evolution with the box size and mesh size for the Dirac equation is investigated.For the weakly bou... Taking the single neutron levels of 12C in the Fermi sea as examples,the optimization of the imaginary time step(ITS) evolution with the box size and mesh size for the Dirac equation is investigated.For the weakly bound states,in order to reproduce the exact single-particle energies and wave functions,a relatively large box size is required.As long as the exact results can be reproduced,the ITS evolution with a smaller box size converges faster,while for both the weakly and deeply bound states,the ITS evolutions are less sensitive to the mesh size.Moreover,one can find a parabola relationship between the mesh size and the corresponding critical time step,i.e.,the largest time step to guarantee the convergence,which suggests that the ITS evolution with a larger mesh size allows larger critical time step,and thus can converge faster to the exact result.These conclusions are very helpful for optimizing the evolution procedure in the future self-consistent calculations. 展开更多
关键词 Dirac equation Schrdinger-like equation imaginary time step method CONVERGENCE
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