在分析制造业面临的新挑战以及网络化制造特点的基础上 ,提出了基于 Web的异地协同设计制造系统的体系结构并开发了一个实际系统 e CWS (e- cooperative work system ) .详细介绍了该系统的功能和关键技术的实现 ,包括协同系统管理、协...在分析制造业面临的新挑战以及网络化制造特点的基础上 ,提出了基于 Web的异地协同设计制造系统的体系结构并开发了一个实际系统 e CWS (e- cooperative work system ) .详细介绍了该系统的功能和关键技术的实现 ,包括协同系统管理、协同工作管理、协同应用、约束管理和冲突消解、协同工具、安全控制、分布式产品数据管理等技术 .最后介绍了应用实例 .展开更多
Because of the randomness of many impact factors influencing the dynamic assembly relationship of complex machinery, the reliability analysis of dynamic assembly relationship needs to be accomplished considering the r...Because of the randomness of many impact factors influencing the dynamic assembly relationship of complex machinery, the reliability analysis of dynamic assembly relationship needs to be accomplished considering the randomness from a probabilistic perspective. To improve the accuracy and efficiency of dynamic assembly relationship reliability analysis, the mechanical dynamic assembly reliability（MDAR） theory and a distributed collaborative response surface method（DCRSM） are proposed. The mathematic model of DCRSM is established based on the quadratic response surface function, and verified by the assembly relationship reliability analysis of aeroengine high pressure turbine（HPT） blade-tip radial running clearance（BTRRC）. Through the comparison of the DCRSM, traditional response surface method（RSM） and Monte Carlo Method（MCM）, the results show that the DCRSM is not able to accomplish the computational task which is impossible for the other methods when the number of simulation is more than 100 000 times, but also the computational precision for the DCRSM is basically consistent with the MCM and improved by 0.40-4.63% to the RSM, furthermore, the computational efficiency of DCRSM is up to about 188 times of the MCM and 55 times of the RSM under 10000 times simulations. The DCRSM is demonstrated to be a feasible and effective approach for markedly improving the computational efficiency and accuracy of MDAR analysis. Thus, the proposed research provides the promising theory and method for the MDAR design and optimization, and opens a novel research direction of probabilistic analysis for developing the high-performance and high-reliability of aeroengine.展开更多
针对多区域电-气互联系统优化调度问题,提出考虑联络线、联络管道能流交互计划的分散式调度方法。首先,利用二阶锥松弛方法将气网潮流方程线性化;在区域间,通过优化联络线与联络管道能流交互计划,对机组出力进行优化配置以促进互联区域...针对多区域电-气互联系统优化调度问题,提出考虑联络线、联络管道能流交互计划的分散式调度方法。首先,利用二阶锥松弛方法将气网潮流方程线性化;在区域间,通过优化联络线与联络管道能流交互计划,对机组出力进行优化配置以促进互联区域的风电消纳,并以单个区域为决策主体建立满足联络线与联络管道约束的集中式优化模型。然后,分析了多区域电-气互联系统能量流解耦机制,并基于标准交替方向乘子法,得到分散式优化算法,即同步交替方向乘子法(synchronous-alternating direction method of multipliers,S-ADMM),再利用上述算法对集中式模型进行重构,建立一种完全分散式的调度模型。最后,在不同规模的多区域电-气互联系统中开展算例分析,其结果表明:所提算法有较优的收敛性;通过联络线与联络管道的互联方式使系统运行最优;多区域电-气互联系统可改变联络线峰谷差率,使各区域发电资源达到配置最优,并减少了区域弃风量,降低了运行成本,可为多区域能源系统优化运行提供参考。展开更多
文摘在分析制造业面临的新挑战以及网络化制造特点的基础上 ,提出了基于 Web的异地协同设计制造系统的体系结构并开发了一个实际系统 e CWS (e- cooperative work system ) .详细介绍了该系统的功能和关键技术的实现 ,包括协同系统管理、协同工作管理、协同应用、约束管理和冲突消解、协同工具、安全控制、分布式产品数据管理等技术 .最后介绍了应用实例 .
基金supported by National Natural Science Foundation of China(Grant Nos.51175017,51245027)Innovation Foundation of Beihang University for PhD Graduates,China(Grant No.YWF-12-RBYJ008)Research Fund for the Doctoral Program of Higher Education of China(Grant No.20111102110011)
文摘Because of the randomness of many impact factors influencing the dynamic assembly relationship of complex machinery, the reliability analysis of dynamic assembly relationship needs to be accomplished considering the randomness from a probabilistic perspective. To improve the accuracy and efficiency of dynamic assembly relationship reliability analysis, the mechanical dynamic assembly reliability（MDAR） theory and a distributed collaborative response surface method（DCRSM） are proposed. The mathematic model of DCRSM is established based on the quadratic response surface function, and verified by the assembly relationship reliability analysis of aeroengine high pressure turbine（HPT） blade-tip radial running clearance（BTRRC）. Through the comparison of the DCRSM, traditional response surface method（RSM） and Monte Carlo Method（MCM）, the results show that the DCRSM is not able to accomplish the computational task which is impossible for the other methods when the number of simulation is more than 100 000 times, but also the computational precision for the DCRSM is basically consistent with the MCM and improved by 0.40-4.63% to the RSM, furthermore, the computational efficiency of DCRSM is up to about 188 times of the MCM and 55 times of the RSM under 10000 times simulations. The DCRSM is demonstrated to be a feasible and effective approach for markedly improving the computational efficiency and accuracy of MDAR analysis. Thus, the proposed research provides the promising theory and method for the MDAR design and optimization, and opens a novel research direction of probabilistic analysis for developing the high-performance and high-reliability of aeroengine.
文摘针对多区域电-气互联系统优化调度问题,提出考虑联络线、联络管道能流交互计划的分散式调度方法。首先,利用二阶锥松弛方法将气网潮流方程线性化;在区域间,通过优化联络线与联络管道能流交互计划,对机组出力进行优化配置以促进互联区域的风电消纳,并以单个区域为决策主体建立满足联络线与联络管道约束的集中式优化模型。然后,分析了多区域电-气互联系统能量流解耦机制,并基于标准交替方向乘子法,得到分散式优化算法,即同步交替方向乘子法(synchronous-alternating direction method of multipliers,S-ADMM),再利用上述算法对集中式模型进行重构,建立一种完全分散式的调度模型。最后,在不同规模的多区域电-气互联系统中开展算例分析,其结果表明:所提算法有较优的收敛性;通过联络线与联络管道的互联方式使系统运行最优;多区域电-气互联系统可改变联络线峰谷差率,使各区域发电资源达到配置最优,并减少了区域弃风量,降低了运行成本,可为多区域能源系统优化运行提供参考。
