Future aerospace vehicles （ASV） are designed to fly in both inner and extra atmospheric fields, which requires autonomous adaptability to the uncertainties emanated from abrupt faults and continuously time-varying e...Future aerospace vehicles （ASV） are designed to fly in both inner and extra atmospheric fields, which requires autonomous adaptability to the uncertainties emanated from abrupt faults and continuously time-varying environments. An autonomous control reconfiguration scheme is presented for ASV to deal with the uncertainties on the base of control effectiveness estimation. The on-line estimation methods for the time-varying control effectiveness of linear control system are investigated. Some sufficient conditions for the estimable system are given for different cases. There are proposed corresponding on-line estimation algorithms which are proved to be convergent and robust to noise using the least-square-based methods. On the ground of fuzzy logic and linear programming, the control allocation algorithms, which are able to implement the autonomous control reconfiguration through the redundant actuators, are put forward. Finally, an integrated system is developed to verify the scheme and algorithms by way of numerical simulation and analysis.展开更多
内悬浮外拉线法是我国高电压杆塔组立的普遍方法,施工抱杆在工程应用中大多依据经验,存在一定的安全隐患。选取皖电东送1 000 k V输变电工程中采用的摇臂抱杆为研究对象,采用有限元软件SAP 2000建立梁-杆混合桁架模型,对抱杆进行整体应...内悬浮外拉线法是我国高电压杆塔组立的普遍方法,施工抱杆在工程应用中大多依据经验,存在一定的安全隐患。选取皖电东送1 000 k V输变电工程中采用的摇臂抱杆为研究对象,采用有限元软件SAP 2000建立梁-杆混合桁架模型,对抱杆进行整体应力状态分析,并在此基础上制定试验方案。共进行7种典型工况下的荷载试验,并将试验结果与有限元结果进行分析和比较。结果表明,抱杆在平臂起吊工况下具有良好的力学性能,验证了抱杆设计的可靠性;低速旋转、同步调幅对构件内力影响较小;不对称力矩是威胁抱杆安全的重要因素,必须加以严控。展开更多
基金National Natural Science Foundation of China (90205011, 60674103)
文摘Future aerospace vehicles （ASV） are designed to fly in both inner and extra atmospheric fields, which requires autonomous adaptability to the uncertainties emanated from abrupt faults and continuously time-varying environments. An autonomous control reconfiguration scheme is presented for ASV to deal with the uncertainties on the base of control effectiveness estimation. The on-line estimation methods for the time-varying control effectiveness of linear control system are investigated. Some sufficient conditions for the estimable system are given for different cases. There are proposed corresponding on-line estimation algorithms which are proved to be convergent and robust to noise using the least-square-based methods. On the ground of fuzzy logic and linear programming, the control allocation algorithms, which are able to implement the autonomous control reconfiguration through the redundant actuators, are put forward. Finally, an integrated system is developed to verify the scheme and algorithms by way of numerical simulation and analysis.
文摘内悬浮外拉线法是我国高电压杆塔组立的普遍方法,施工抱杆在工程应用中大多依据经验,存在一定的安全隐患。选取皖电东送1 000 k V输变电工程中采用的摇臂抱杆为研究对象,采用有限元软件SAP 2000建立梁-杆混合桁架模型,对抱杆进行整体应力状态分析,并在此基础上制定试验方案。共进行7种典型工况下的荷载试验,并将试验结果与有限元结果进行分析和比较。结果表明,抱杆在平臂起吊工况下具有良好的力学性能,验证了抱杆设计的可靠性;低速旋转、同步调幅对构件内力影响较小;不对称力矩是威胁抱杆安全的重要因素,必须加以严控。
