随着对新一代飞机智能化、自动化的要求越来越高,对机载总线数据传输的实时性、确定性、可靠性也提出了更高要求。OPC UA over TSN作为当前航空领域重要的创新技术,通过提供一个实时开放互联的工业通信网络架构,满足航电系统确定性时延...随着对新一代飞机智能化、自动化的要求越来越高,对机载总线数据传输的实时性、确定性、可靠性也提出了更高要求。OPC UA over TSN作为当前航空领域重要的创新技术,通过提供一个实时开放互联的工业通信网络架构,满足航电系统确定性时延和高可靠的需求,弥补传统机载总线在易用性、互操作性、带宽上的不足。该设计详细介绍了时间敏感网络(TSN)协议和开放平台通信统一架构(OPC UA)技术的基本内容,通过分析OPC UA over TSN技术的发展现状,提出了基于OPC UA over TSN的网络架构和配置架构。该技术代表着未来机载总线的发展趋势,具有很大的应用潜力。展开更多
Active vibration control is an effective way of increasing robustness of the design to meet the stringent accuracy requirements for space structures. This paper presents the results of active damping realized by a pie...Active vibration control is an effective way of increasing robustness of the design to meet the stringent accuracy requirements for space structures. This paper presents the results of active damping realized by a piezoelectric active member to control the vibration of a four-bay four-longern aluminum truss structure with cantilever boundary. The active member, which utilizes a piezoelectric actuating unit and an integrated load cell, is designed for vibration control of the space truss structures. Active damping control is realized using direct velocity feedback around the active member. The placement of the active member as one of the most important factor of affecting the control system performance, is also investigated by modal dissipation energy ratio as indicator. The active damping effectiveness is evaluated by comparing the closed-loop response with the open loop response.展开更多
This paper analyzes of the bottleneck to influence the running efficiency of educational administration system in universities and colleges,and from the system deployment architecture, server configuration, database S...This paper analyzes of the bottleneck to influence the running efficiency of educational administration system in universities and colleges,and from the system deployment architecture, server configuration, database SQL statement optimization and other aspects, it puts forwards the optimization scheme.展开更多
文摘随着对新一代飞机智能化、自动化的要求越来越高,对机载总线数据传输的实时性、确定性、可靠性也提出了更高要求。OPC UA over TSN作为当前航空领域重要的创新技术,通过提供一个实时开放互联的工业通信网络架构,满足航电系统确定性时延和高可靠的需求,弥补传统机载总线在易用性、互操作性、带宽上的不足。该设计详细介绍了时间敏感网络(TSN)协议和开放平台通信统一架构(OPC UA)技术的基本内容,通过分析OPC UA over TSN技术的发展现状,提出了基于OPC UA over TSN的网络架构和配置架构。该技术代表着未来机载总线的发展趋势,具有很大的应用潜力。
文摘Active vibration control is an effective way of increasing robustness of the design to meet the stringent accuracy requirements for space structures. This paper presents the results of active damping realized by a piezoelectric active member to control the vibration of a four-bay four-longern aluminum truss structure with cantilever boundary. The active member, which utilizes a piezoelectric actuating unit and an integrated load cell, is designed for vibration control of the space truss structures. Active damping control is realized using direct velocity feedback around the active member. The placement of the active member as one of the most important factor of affecting the control system performance, is also investigated by modal dissipation energy ratio as indicator. The active damping effectiveness is evaluated by comparing the closed-loop response with the open loop response.
基金Acknowledgement Research of the nature science foundation of Shandong province has a triangular surface modeling and control display representation（No. ZR2012FL05）
文摘This paper analyzes of the bottleneck to influence the running efficiency of educational administration system in universities and colleges,and from the system deployment architecture, server configuration, database SQL statement optimization and other aspects, it puts forwards the optimization scheme.
