Monte Carlo模拟方法中采用了结点再取向“择优转换原则”,并用线性Turnbull动力学晶界移动速率公式概率形式确定结点取向转换概率,对晶粒长大过程进行长时间的模拟.模拟的组织变化图像与实际材料的正常晶粒长大组织完全一致;长大过程...Monte Carlo模拟方法中采用了结点再取向“择优转换原则”,并用线性Turnbull动力学晶界移动速率公式概率形式确定结点取向转换概率,对晶粒长大过程进行长时间的模拟.模拟的组织变化图像与实际材料的正常晶粒长大组织完全一致;长大过程分为不稳定和稳定两个阶段,稳定阶段晶粒长大指数n达到了理论值0.5;在完整的晶粒长大过程中,晶粒尺寸分布并不具有严格的自相似性,系由不稳定长大阶段的对数正态分布(Lognormal)向稳定阶段的伽马(Gamma)分布变化.展开更多
Monte Carlo simulation was applied to Assembly Success Bate (ASK) analyses. ASR of two peg-in-hole robot assemblies was used as an example by taking component parts' sizes, manufacturing tolerances and robot repea...Monte Carlo simulation was applied to Assembly Success Bate (ASK) analyses. ASR of two peg-in-hole robot assemblies was used as an example by taking component parts' sizes, manufacturing tolerances and robot repeatability into account. A statistic arithmetic expression was proposed and deduced in this paper, which offers an alternative method of estimating the accuracy of ASR, without having to repeat the simulations. This statistic method also helps to choose a suitable sample size, if error reduction is desired. Monte Carlo simulation results demonstrated the feasibility of the method.展开更多
采用作者提出的Monte Carlo Potts新模型,模拟研究了高纯铝在各向异性晶界能和晶界迁移率条件下晶粒长大的组织、动力学和晶粒尺寸分布特征,揭示初始组织织构强度对异常晶粒长大的影响规律。结果表明:各向异性晶界能和晶界迁移率使晶粒...采用作者提出的Monte Carlo Potts新模型,模拟研究了高纯铝在各向异性晶界能和晶界迁移率条件下晶粒长大的组织、动力学和晶粒尺寸分布特征,揭示初始组织织构强度对异常晶粒长大的影响规律。结果表明:各向异性晶界能和晶界迁移率使晶粒尺寸不均匀、形状不规则,降低了晶粒长大指数,晶粒尺寸分布偏离对数正态分布;异常晶粒长大只出现在中等强度的织构组织中,而不会在太强或太弱织构组织中出现。理论分析认为各向异性晶界能和晶界迁移率是异常晶粒长大的内因,织构是引起异常晶粒长大的外因,其强度决定了异常晶粒长大是否出现。展开更多
An optimal sizing method is proposed in this paper for mobile battery energy storage system(MBESS)in the distribution system with renewables.The optimization is formulated as a bi-objective problem,considering the rel...An optimal sizing method is proposed in this paper for mobile battery energy storage system(MBESS)in the distribution system with renewables.The optimization is formulated as a bi-objective problem,considering the reliability improvement and energy transaction saving,simultaneously.To evaluate the reliability of distribution system with MBESS and intermittent generation sources,a new framework is proposed,which is based on zone partition and identification of circuit minimal tie sets.Both analytic and simulation methods for reliability assessment are presented and compared in the framework.Case studies on a modified IEEE benchmark system have verified the performance of the proposed approach.展开更多
文摘Monte Carlo simulation was applied to Assembly Success Bate (ASK) analyses. ASR of two peg-in-hole robot assemblies was used as an example by taking component parts' sizes, manufacturing tolerances and robot repeatability into account. A statistic arithmetic expression was proposed and deduced in this paper, which offers an alternative method of estimating the accuracy of ASR, without having to repeat the simulations. This statistic method also helps to choose a suitable sample size, if error reduction is desired. Monte Carlo simulation results demonstrated the feasibility of the method.
文摘采用作者提出的Monte Carlo Potts新模型,模拟研究了高纯铝在各向异性晶界能和晶界迁移率条件下晶粒长大的组织、动力学和晶粒尺寸分布特征,揭示初始组织织构强度对异常晶粒长大的影响规律。结果表明:各向异性晶界能和晶界迁移率使晶粒尺寸不均匀、形状不规则,降低了晶粒长大指数,晶粒尺寸分布偏离对数正态分布;异常晶粒长大只出现在中等强度的织构组织中,而不会在太强或太弱织构组织中出现。理论分析认为各向异性晶界能和晶界迁移率是异常晶粒长大的内因,织构是引起异常晶粒长大的外因,其强度决定了异常晶粒长大是否出现。
基金This work was supported by the National Natural Science Foundation of China(Young Scholar Program 71401017,General Program 51277016)State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(Grant No.LAPS14002)+1 种基金Fujian regional science and technology major projects,China(2013H41010151)Hong Kong RGC Theme Based Research Scheme Grant No.T23-407/13-N.
文摘An optimal sizing method is proposed in this paper for mobile battery energy storage system(MBESS)in the distribution system with renewables.The optimization is formulated as a bi-objective problem,considering the reliability improvement and energy transaction saving,simultaneously.To evaluate the reliability of distribution system with MBESS and intermittent generation sources,a new framework is proposed,which is based on zone partition and identification of circuit minimal tie sets.Both analytic and simulation methods for reliability assessment are presented and compared in the framework.Case studies on a modified IEEE benchmark system have verified the performance of the proposed approach.
