Thermal controllers equipped with phase-change materials are widely used for maintaining the moderate temperatures of various electric devices used in spacecraft. Yet, the structures of amounts of thermal controllers ...Thermal controllers equipped with phase-change materials are widely used for maintaining the moderate temperatures of various electric devices used in spacecraft. Yet, the structures of amounts of thermal controllers add up to such a large value that restricts the employment of scientific devices due to the limit of rocket capacity. A lightweight structure of phase-change thermal controllers has been one of the main focuses of spacecraft design engineering. In this work, we design a lightweight phase-change thermal controller structure based on lattice cells. The structure is manufactured entirely with AlSi10 Mg by direct metal laser melting. The dimensions of the structure are 230 mm × 170 mm × 15 mm, and the mass is 190 g, which is 60% lighter than most traditional structures(500–600 g) with the same dimensions. The 3 D-printed structure can reduce the risk of leakage at soldering manufacture by a welding process. Whether the strength of the designed structure is sufficient is determined through mechanical analysis and experiments. Thermal test results show that the thermal capacity of the lattice-based thermal controller is increased by50% compared to that of traditional controllers with the same volume.展开更多
当今,使用手机网页来访问大规模建筑环境逐渐被人们所追求.BIM(building information modeling)是新一代智能建造的核心技术.本文以其主流格式IFC(industry foundation classes)作为输入数据格式,提出一套面向手机网页的大规模Web BIM...当今,使用手机网页来访问大规模建筑环境逐渐被人们所追求.BIM(building information modeling)是新一代智能建造的核心技术.本文以其主流格式IFC(industry foundation classes)作为输入数据格式,提出一套面向手机网页的大规模Web BIM场景实时漫游算法.与图形学领域的可视化程序相比,该方法不只注重可视化渲染时的面片级处理,更是在遵从建筑语义的前提下,以建筑构件为单位,对大规模Web BIM场景进行轻量化处理.方法主要从构件实例冗余、构件及空间混合索引、多粒度数据动态装/卸载策略3方面对场景数据量、组织结构、动态数据管理进行优化,并集成到原型系统.实验表明本文方法的去冗比例达70%左右,原型系统的FPS能保持在30左右,内存损耗约400 MB,能较稳定、流畅地在手机网页上进行大规模Web BIM场景的实时漫游.展开更多
基金supports from Beijing Institute of Spacecraft System Engineering and the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(Nos.2017QNRC001,2016QNRC001)
文摘Thermal controllers equipped with phase-change materials are widely used for maintaining the moderate temperatures of various electric devices used in spacecraft. Yet, the structures of amounts of thermal controllers add up to such a large value that restricts the employment of scientific devices due to the limit of rocket capacity. A lightweight structure of phase-change thermal controllers has been one of the main focuses of spacecraft design engineering. In this work, we design a lightweight phase-change thermal controller structure based on lattice cells. The structure is manufactured entirely with AlSi10 Mg by direct metal laser melting. The dimensions of the structure are 230 mm × 170 mm × 15 mm, and the mass is 190 g, which is 60% lighter than most traditional structures(500–600 g) with the same dimensions. The 3 D-printed structure can reduce the risk of leakage at soldering manufacture by a welding process. Whether the strength of the designed structure is sufficient is determined through mechanical analysis and experiments. Thermal test results show that the thermal capacity of the lattice-based thermal controller is increased by50% compared to that of traditional controllers with the same volume.
文摘当今,使用手机网页来访问大规模建筑环境逐渐被人们所追求.BIM(building information modeling)是新一代智能建造的核心技术.本文以其主流格式IFC(industry foundation classes)作为输入数据格式,提出一套面向手机网页的大规模Web BIM场景实时漫游算法.与图形学领域的可视化程序相比,该方法不只注重可视化渲染时的面片级处理,更是在遵从建筑语义的前提下,以建筑构件为单位,对大规模Web BIM场景进行轻量化处理.方法主要从构件实例冗余、构件及空间混合索引、多粒度数据动态装/卸载策略3方面对场景数据量、组织结构、动态数据管理进行优化,并集成到原型系统.实验表明本文方法的去冗比例达70%左右,原型系统的FPS能保持在30左右,内存损耗约400 MB,能较稳定、流畅地在手机网页上进行大规模Web BIM场景的实时漫游.
