To improve the computational efficiency of the reliability-based design optimization(RBDO) of flexible mechanism, particle swarm optimization-advanced extremum response surface method(PSO-AERSM) was proposed by integr...To improve the computational efficiency of the reliability-based design optimization(RBDO) of flexible mechanism, particle swarm optimization-advanced extremum response surface method(PSO-AERSM) was proposed by integrating particle swarm optimization(PSO) algorithm and advanced extremum response surface method(AERSM). Firstly, the AERSM was developed and its mathematical model was established based on artificial neural network, and the PSO algorithm was investigated. And then the RBDO model of flexible mechanism was presented based on AERSM and PSO. Finally, regarding cross-sectional area as design variable, the reliability optimization of flexible mechanism was implemented subject to reliability degree and uncertainties based on the proposed approach. The optimization results show that the cross-section sizes obviously reduce by 22.96 mm^2 while keeping reliability degree. Through the comparison of methods, it is demonstrated that the AERSM holds high computational efficiency while keeping computational precision for the RBDO of flexible mechanism, and PSO algorithm minimizes the response of the objective function. The efforts of this work provide a useful sight for the reliability optimization of flexible mechanism, and enrich and develop the reliability theory as well.展开更多
在基于电磁辐射的无线能量传输与获取技术中,如何准确获取肖特基二极管的最优工作状态一直是国内外的研究热点。本文针对已有相关研究的不足,提出了一种基于Advanced Design System(ADS)电路仿真软件获取微波整流电路中整流二极管阻抗...在基于电磁辐射的无线能量传输与获取技术中,如何准确获取肖特基二极管的最优工作状态一直是国内外的研究热点。本文针对已有相关研究的不足,提出了一种基于Advanced Design System(ADS)电路仿真软件获取微波整流电路中整流二极管阻抗的方法。该方法基于单管并联整流电路的理想模型,通过"阻抗获取-阻抗匹配"的迭代过程,得到该电路结构下对应于最优整流性能时的二极管阻抗收敛值。该方法操作流程简明,计算量较小,结果较准确。根据该收敛阻抗,本文设计了一种单管并联验证电路,把输入滤波器和直流滤波器共有的高次谐波抑制部分整合到二极管支路,使得整体结构更为紧凑,总体插入损耗更小。实测结果与仿真结果较为吻合,在输入功率为8.3 d Bm,直流负载为1300Ω时,电路实测输出电压为2.469 V,整流效率可达69.36%,在输入功率为-1.6~11.4 d Bm的范围内,整流效率均在50%以上。展开更多
基金Projects(51275138,51475025)supported by the National Natural Science Foundation of ChinaProject(12531109)supported by the Science Foundation of Heilongjiang Provincial Department of Education,China+1 种基金Projects(XJ2015002,G-YZ90)supported by Hong Kong Scholars Program,ChinaProject(2015M580037)supported by Postdoctoral Science Foundation of China
文摘To improve the computational efficiency of the reliability-based design optimization(RBDO) of flexible mechanism, particle swarm optimization-advanced extremum response surface method(PSO-AERSM) was proposed by integrating particle swarm optimization(PSO) algorithm and advanced extremum response surface method(AERSM). Firstly, the AERSM was developed and its mathematical model was established based on artificial neural network, and the PSO algorithm was investigated. And then the RBDO model of flexible mechanism was presented based on AERSM and PSO. Finally, regarding cross-sectional area as design variable, the reliability optimization of flexible mechanism was implemented subject to reliability degree and uncertainties based on the proposed approach. The optimization results show that the cross-section sizes obviously reduce by 22.96 mm^2 while keeping reliability degree. Through the comparison of methods, it is demonstrated that the AERSM holds high computational efficiency while keeping computational precision for the RBDO of flexible mechanism, and PSO algorithm minimizes the response of the objective function. The efforts of this work provide a useful sight for the reliability optimization of flexible mechanism, and enrich and develop the reliability theory as well.
文摘在基于电磁辐射的无线能量传输与获取技术中,如何准确获取肖特基二极管的最优工作状态一直是国内外的研究热点。本文针对已有相关研究的不足,提出了一种基于Advanced Design System(ADS)电路仿真软件获取微波整流电路中整流二极管阻抗的方法。该方法基于单管并联整流电路的理想模型,通过"阻抗获取-阻抗匹配"的迭代过程,得到该电路结构下对应于最优整流性能时的二极管阻抗收敛值。该方法操作流程简明,计算量较小,结果较准确。根据该收敛阻抗,本文设计了一种单管并联验证电路,把输入滤波器和直流滤波器共有的高次谐波抑制部分整合到二极管支路,使得整体结构更为紧凑,总体插入损耗更小。实测结果与仿真结果较为吻合,在输入功率为8.3 d Bm,直流负载为1300Ω时,电路实测输出电压为2.469 V,整流效率可达69.36%,在输入功率为-1.6~11.4 d Bm的范围内,整流效率均在50%以上。
