Novel robust fault diagnosis method for flight control systems

A novel robust fault diagnosis scheme, which possesses fault estimate capability as well as fault diagnosis property, is proposed. The scheme is developed based on a suitable combination of the adaptive multiple model （AMM） and unknown input observer （UIO）. The main idea of the proposed scheme stems from the fact that the actuator Lock-in-Place fault is unknown （when and where the actuator gets locked are unknown）, and multiple models are used to describe different fault scenarios, then a bank of unknown input observers are designed to implement the disturbance de-coupling. According to Lyapunov theory, proof of the robustness of the newly developed scheme in the presence of faults and disturbances is derived. Numerical simulation results on an aircraft example show satisfactory performance of the proposed algorithm.     

Chinese Economic Structure and SDA Model

1　IntroductionSincethebeginningoftheeconomicreformin1978,Chineseeconomyhasbeendevelopingveryquickly.Inthepast18years,from1978to1996,thegrossdomesticproduct(GDP)increasedatanaverageannualrateof9.78%,andpercapitaGDPincreasedatanaverageannualrateof8.40%.Particularly,from1980to1996theaverageannualgrowthrateofGDPwas10.47%andthatofpercapitaGDPwas8.98%.AsaresultofthefasteconomicgrowththeeconomicstructureinChinachangedrapidly.TheratioofprimaryindustryinGDPdecreased.Itwas28.1%in1978and20.2%in1…     

大系统管理决策

对具有众多子系统及其一个平衡关系——投入产出分析表的大系统,提出了一套管理决策方法此技术涉及许多新概念,如田口的信噪比[1],多变量Cp统计[4],多边矩阵[6]等关于大系统的最优方案组合可以从它的子系统的决策方案逐步得到一般地,此方法可以立即给出许多优良的方案,以供管理决策者从中选取可行的、经济的和满意的方案.     

吉林省水资源投入产出分析

水资源的有限供给已成为农业大省吉林省实现持续发展的制约因素为了充分有效地利用水资源,本文建立了吉林省水资源投入产出表,通过计算、分析,表明农业耗水量巨大且经济效益低,农产品的调出又导致水资源的大量外流为此,本文提出在全省范围内合理规划配水,在农业系统内部大力节水的对策.     

试论高新区产学研战略联盟的构建

在分析高新区实施产学研战略联盟重大意义的基础上,着重探讨了高新区如何构建产学研战略联盟。     

2006年山西省地方财政科技拨款分析

分析了2006年山西省地方财政科技拨款投入总体情况,阐述了山西省省本级财政科技拨款情况和太原市市本级财政科技拨款情况。     

高性能耐火耐候建筑用钢WGJ510C2的研制及应用

对武流钢铁(集团)公司(以下简称武钢)研制的高性能耐火耐侯建筑用网WGJ520C2的力学性能、焊接性能、而火性能、时候性能及其典型应用进行了研究。试验结果表明：该钢具有优良的综合力学性能,在600℃温度下的届服强度均高于其室温下屈服强度的2／3。完全满足建筑结构用钢耐火安全性的强度许用指标;具有低的焊接冷裂纹敏感性．能承受大线能量(50～100kJ/cm)焊接;裸钢的耐火极限比Q235钢高出44％左右．在考虑建筑设计一级防火标准时,使用该钢可比使用Q235钢节省薄型防火涂料36．5%～50%．节省厚型防火涂料26％;经过1800h加速循环腐蚀以后．该钢的腐蚀率与Q235钢和0345网相比分别减少20%和29％;经过武汉10个月大气曝晒试验的结果也表明,该钢的耐候性能也明显优于Q235钢和0345钢。该钢在大型建筑应用中的实际效果良好。     

空分和频分混合接入方式下的无线资源调度算法

为进一步引入分集增益以提高无线资源频谱利用率,针对多用户多输入多输出-正交频分复用(MIMO-OFDM)系统下行传输,提出联合OFDM和多用户空间复用MIMO混合接入方式下的用户调度和功率分配算法。采用这种混合接入方式不仅能够通过频率信道和空间信道的调度产生多用户分集增益,而且能有效避免空分复用(SDMA)中频率复用产生的共信道干扰问题。在资源分配上,基于广义处理机共享(GPS)优化模型提出基于信道状态的并行加权公平队列(Cap-WFQ)调度和功率分配算法,算法在保证多媒体用户的最小数据率要求的同时优化系统的吞吐量。     

MIMO Channel Estimation and Equalization Using Three-Layer Neural Networks with Feedback

This paper describes a channel estimation and equalization algorithm using three-layer artificial neural networks （ANNs） with feedback for multiple input multiple output wireless communication systems. An ANN structure with feedback was designed to use different learning algorithms in the different ANN layers. This actually forms a Turbo iteration process between the different algorithms which effectively improves the estimation performance of the channel equalizer. Simulation results show that this channel equalization algorithm has better computational efficiency and faster convergence than higher order statistics based algorithms.