Aiming at the problem that it is difficult to generate the dynamic decoupling equation of the parallel six-dimensional acceleration sensing mechanism,two typical parallel six-dimensional acceleration sensing mechanism...Aiming at the problem that it is difficult to generate the dynamic decoupling equation of the parallel six-dimensional acceleration sensing mechanism,two typical parallel six-dimensional acceleration sensing mechanisms are taken as examples.By analyzing the scale constraint relationship between the hinge points on the mass block and the hinge points on the base of the sensing mechanism,a new method for establishing the dynamic equation of the sensing mechanism is proposed.Firstly,based on the scale constraint relationship between the hinge points on the mass block and the hinge points on the base of the sensing mechanism,the expression of the branch rod length is obtained.The inherent constraint relationship between the branches is excavated and the branch coordination closed chain of the“12-6”configuration is constructed.The output coordination equation of the sensing mechanism is successfully derived.Secondly,the dynamic equations of“12-4”and“12-6”configurations are constructed by the Newton-Euler method,and the forward decoupling equations of the two configurations are solved by combining the dynamic equations and the output coordination equations.Finally,the virtual prototype experiment is carried out,and the maximum reference errors of the forward decoupling equations of the two configuration sensing mechanisms are 4.23%and 6.53%,respectively.The results show that the proposed method is effective and feasible,and meets the real-time requirements.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
A new copper strip production technology combined with continuous extrusion and rolling technology was proposed. The roll velocity must first be matched with the continuous extrusion velocity to achieve continuous ext...A new copper strip production technology combined with continuous extrusion and rolling technology was proposed. The roll velocity must first be matched with the continuous extrusion velocity to achieve continuous extrusion and roll forming. The bite condition of continuous extrusion was determined, and the compatibility equation between the roll velocity and parameters such as the extrusion wheel velocity, reduction, and strip size was established through mechanical by plastic theoretical calculations. The finite element model of continuous extrusion and rolling was then established by using the TLJ400 continuous extrusion machine with a roll diameter of 200 mm. The relationship between the continuous extrusion and rolling velocities was determined through numerical simulations by software DEFORM-3D, and the accuracy of compatibility equation of velocity was verified.展开更多
基金supported in part by the National Natural Science Foundation of China(No.51405237)。
文摘Aiming at the problem that it is difficult to generate the dynamic decoupling equation of the parallel six-dimensional acceleration sensing mechanism,two typical parallel six-dimensional acceleration sensing mechanisms are taken as examples.By analyzing the scale constraint relationship between the hinge points on the mass block and the hinge points on the base of the sensing mechanism,a new method for establishing the dynamic equation of the sensing mechanism is proposed.Firstly,based on the scale constraint relationship between the hinge points on the mass block and the hinge points on the base of the sensing mechanism,the expression of the branch rod length is obtained.The inherent constraint relationship between the branches is excavated and the branch coordination closed chain of the“12-6”configuration is constructed.The output coordination equation of the sensing mechanism is successfully derived.Secondly,the dynamic equations of“12-4”and“12-6”configurations are constructed by the Newton-Euler method,and the forward decoupling equations of the two configurations are solved by combining the dynamic equations and the output coordination equations.Finally,the virtual prototype experiment is carried out,and the maximum reference errors of the forward decoupling equations of the two configuration sensing mechanisms are 4.23%and 6.53%,respectively.The results show that the proposed method is effective and feasible,and meets the real-time requirements.
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。
基金Project(51175055) supported by the National Natural Science Foundation of ChinaProject(201102020) supported by the Natural Science Foundation of Liaoning Province,ChinaProject(2011BAE23B01) supported by the National Key Technology R&D Program of China
文摘A new copper strip production technology combined with continuous extrusion and rolling technology was proposed. The roll velocity must first be matched with the continuous extrusion velocity to achieve continuous extrusion and roll forming. The bite condition of continuous extrusion was determined, and the compatibility equation between the roll velocity and parameters such as the extrusion wheel velocity, reduction, and strip size was established through mechanical by plastic theoretical calculations. The finite element model of continuous extrusion and rolling was then established by using the TLJ400 continuous extrusion machine with a roll diameter of 200 mm. The relationship between the continuous extrusion and rolling velocities was determined through numerical simulations by software DEFORM-3D, and the accuracy of compatibility equation of velocity was verified.
