Scientists have been searching for possible new particles beyond the standard model(SM),the theory that has predicted the building bricks that have constituted the known matter world today,including the Higgs-“the l...Scientists have been searching for possible new particles beyond the standard model(SM),the theory that has predicted the building bricks that have constituted the known matter world today,including the Higgs-“the last”SM particle.展开更多
Effective motors are crucial for driving astronomical telescopes,especially for those operating in Antarctica,where the harsh environment and operating conditions,including extreme low temperature,ice/snow accumulatio...Effective motors are crucial for driving astronomical telescopes,especially for those operating in Antarctica,where the harsh environment and operating conditions,including extreme low temperature,ice/snow accumulation,low power consumption,and unattended operation,introduce challenges to the design and development of motor drives.We present the design of a permanent magnet synchronous motor suitable for this environment,conducting a quantitative analysis on the impacts of cryogenic conditions on lubricant performance,differential thermal contraction of metallic components,and remanent flux density of neodymium iron boron(N52)permanent magnets.We also implement a labyrinth seal structure,combined with silicone sealing rings,to mitigate ice crystal intrusion risks.Finite element analysis and laboratory tests demonstrate a maximum torque output of 25 Nm.This kind of motor is used in the Antarctic 15 cm Near Infrared Telescope at Dome A,Antarctica.Operation data shows a total encoder feedback error of 0.0678"for the telescope control system with 15"s^(−1)tracking speed at−56.79°C.These results comprehensively validate the high reliability and precision of the motor under the extreme conditions of the polar environment.展开更多
环境信息是大天区面积多目标光纤光谱望远镜(the Large Sky Area Multi-Object Fiber Spectroscopic Telescope,LAMOST,又叫郭守敬望远镜)运行状态的一部分,用于辅助望远镜的日常维护、观测以及后期数据处理。环境信息来源于多个子系统...环境信息是大天区面积多目标光纤光谱望远镜(the Large Sky Area Multi-Object Fiber Spectroscopic Telescope,LAMOST,又叫郭守敬望远镜)运行状态的一部分,用于辅助望远镜的日常维护、观测以及后期数据处理。环境信息来源于多个子系统,而子系统的数据存储由不同单位设计,数据存储环境复杂,不利于统一检索。基于异步协程提出了一种异构环境信息检索的方法,该方法利用数据库代理对象工厂(Data Base Agent Factory,DBAF)整合多个数据库及检索字段信息,通过客户端和网络浏览器提供远程服务,以自定义检索命令的方式实现对异构数据库的检索。本方法充分考虑了后期升级的需求,保留多种数据库和应用接口,便于更多数据库和应用的接入。目前基于该方法开发的检索系统已部署于郭守敬望远镜,在运行中简化了运行环境检索操作,提高了环境数据获取的精准度,提升了望远镜的维护和观测效率。展开更多
文摘Scientists have been searching for possible new particles beyond the standard model(SM),the theory that has predicted the building bricks that have constituted the known matter world today,including the Higgs-“the last”SM particle.
基金supported by the Space Debris Resear-ch Project,China(KJSP2020010102)the NationalKey R&D Program of China(2022YFC2807300).
文摘Effective motors are crucial for driving astronomical telescopes,especially for those operating in Antarctica,where the harsh environment and operating conditions,including extreme low temperature,ice/snow accumulation,low power consumption,and unattended operation,introduce challenges to the design and development of motor drives.We present the design of a permanent magnet synchronous motor suitable for this environment,conducting a quantitative analysis on the impacts of cryogenic conditions on lubricant performance,differential thermal contraction of metallic components,and remanent flux density of neodymium iron boron(N52)permanent magnets.We also implement a labyrinth seal structure,combined with silicone sealing rings,to mitigate ice crystal intrusion risks.Finite element analysis and laboratory tests demonstrate a maximum torque output of 25 Nm.This kind of motor is used in the Antarctic 15 cm Near Infrared Telescope at Dome A,Antarctica.Operation data shows a total encoder feedback error of 0.0678"for the telescope control system with 15"s^(−1)tracking speed at−56.79°C.These results comprehensively validate the high reliability and precision of the motor under the extreme conditions of the polar environment.
文摘环境信息是大天区面积多目标光纤光谱望远镜(the Large Sky Area Multi-Object Fiber Spectroscopic Telescope,LAMOST,又叫郭守敬望远镜)运行状态的一部分,用于辅助望远镜的日常维护、观测以及后期数据处理。环境信息来源于多个子系统,而子系统的数据存储由不同单位设计,数据存储环境复杂,不利于统一检索。基于异步协程提出了一种异构环境信息检索的方法,该方法利用数据库代理对象工厂(Data Base Agent Factory,DBAF)整合多个数据库及检索字段信息,通过客户端和网络浏览器提供远程服务,以自定义检索命令的方式实现对异构数据库的检索。本方法充分考虑了后期升级的需求,保留多种数据库和应用接口,便于更多数据库和应用的接入。目前基于该方法开发的检索系统已部署于郭守敬望远镜,在运行中简化了运行环境检索操作,提高了环境数据获取的精准度,提升了望远镜的维护和观测效率。
