An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, clo...An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.展开更多
This article addresses the design of the trajectory transferring from Earth to Halo orbit, and proposes a timing closed-loop strategy of correction maneuver during the transfer in the frame of circular restricted thre...This article addresses the design of the trajectory transferring from Earth to Halo orbit, and proposes a timing closed-loop strategy of correction maneuver during the transfer in the frame of circular restricted three body problem （CR3BP）. The relation between the Floquet multipliers and the magnitudes of Halo orbit is established, so that the suitable magnitude for the aerospace mission is chosen in terms of the stability of Halo orbit. The stable manifold is investigated from the Poincar6 mapping defined which is different from the previous researches, and six types of single-impulse transfer trajectories are attained from the geometry of the invariant manifolds. Based on one of the trajectories of indirect transfer which are ignored in the most of literatures, the stochastic control theory for imperfect information of the discrete linear stochastic system is applied to design the trajectory correction maneuver. The statistical dispersion analysis is performed by Monte-Carlo simulation,展开更多
压缩空气储能(compressed air energy storage,CAES)技术是一种新型的物理储能技术,也是一种具有广阔发展前景的大规模储能发电技术。大规模压缩空气储能通常需要配置大容量的地下储气装置。在现有的地下储气库类型中,内衬式人工硐室地...压缩空气储能(compressed air energy storage,CAES)技术是一种新型的物理储能技术,也是一种具有广阔发展前景的大规模储能发电技术。大规模压缩空气储能通常需要配置大容量的地下储气装置。在现有的地下储气库类型中,内衬式人工硐室地下储气库因其选址灵活、限制条件少成为近年来的研究热点。在当前国内对大规模CAES技术需求迫切的背景下,对人工硐室储气库的理论研究成果和技术发展现状进行了全面梳理和评述,分析了现有地下储气库稳定性分析理论、内衬硐室密封方案和热力学过程分析方法等的优点和不足,并讨论了内衬式人工硐室储气库工程的设计要点和注意事项。最后,提出了影响内衬式人工硐室储气行业发展面临的挑战。展开更多
基金Project(51274250)supported by the National Natural Science Foundation of ChinaProject(2012BAK09B02-05)supported by the National Key Technology R&D Program during the 12th Five-year Plan of China
文摘An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.
基金National Natural Science Foundation of China (10702003)Innovation Foundation of Beijing University of Aeronautics and Astronautics for Ph.D. Graduates
文摘This article addresses the design of the trajectory transferring from Earth to Halo orbit, and proposes a timing closed-loop strategy of correction maneuver during the transfer in the frame of circular restricted three body problem （CR3BP）. The relation between the Floquet multipliers and the magnitudes of Halo orbit is established, so that the suitable magnitude for the aerospace mission is chosen in terms of the stability of Halo orbit. The stable manifold is investigated from the Poincar6 mapping defined which is different from the previous researches, and six types of single-impulse transfer trajectories are attained from the geometry of the invariant manifolds. Based on one of the trajectories of indirect transfer which are ignored in the most of literatures, the stochastic control theory for imperfect information of the discrete linear stochastic system is applied to design the trajectory correction maneuver. The statistical dispersion analysis is performed by Monte-Carlo simulation,
文摘压缩空气储能(compressed air energy storage,CAES)技术是一种新型的物理储能技术,也是一种具有广阔发展前景的大规模储能发电技术。大规模压缩空气储能通常需要配置大容量的地下储气装置。在现有的地下储气库类型中,内衬式人工硐室地下储气库因其选址灵活、限制条件少成为近年来的研究热点。在当前国内对大规模CAES技术需求迫切的背景下,对人工硐室储气库的理论研究成果和技术发展现状进行了全面梳理和评述,分析了现有地下储气库稳定性分析理论、内衬硐室密封方案和热力学过程分析方法等的优点和不足,并讨论了内衬式人工硐室储气库工程的设计要点和注意事项。最后,提出了影响内衬式人工硐室储气行业发展面临的挑战。
