自适应机翼的发展现状及其关键技术研究

综述了近二十年来国内外自适应机翼技术的研究现状以及该领域需要解决的关键技术,对未来这一技术的发展和应用进行了展望。     

Intelligent Video Traffic Smooth Mechanism for Multimedia Communication

A principal challenge in supporting real-time video services over ATM is the need to provide synchronous play-out in the face of stochastic end-to-end network delays. In this paper, an intelligent traffic smooth mechanism ( ITSM ) is proposed to meet the continuity requirement which is composed of a back-propagation neural network ( BPNN ) traffic predictor, a play-out buffer, and a fuzzy neural network ( FNN ) based play-out rate determinator. The BPNN traffic predictor online predicts the mean packet rate of the traffic in the future interval ( FI ) and the FNN is designed to adaptively determinate the play-out time according to the number of packets in the buffer and the traffic character predicted. Simulation results show that compared to the window mechanism, ITSM achieves high continuity with accepted delay. Furthermore, ITSM can be adaptively modified to meet the QoS of different kinds of services by FNN parameter training.     

Experimental Study of the Vibration Phenomenon of Compressor Rotor Blade Induced by Inlet Probe Support

An experimental investigation was conducted in order to understand the installation effects of inlet measurement probes on the vibration characteristics of the ...     

冷连轧机的动态变规格过程的计算机仿真

针对某厂的5机架冷连轧机的动态变规格过程进行仿真研究.首先建立其动态变规格时的仿真系统,分析了其动态变规格过程的实现方案.然后在此基础上对其变规格过程进行了仿真分析,指出了现在方案中的问题,提出了一种改进方案,并通过进一步的仿真说明了改进方案的可行性和有效性.     

钢模台车在引水隧洞混凝土衬砌施工中的应用

介绍应用钢模台车浇筑衬砌混凝土的施工工艺、存在的问题、原因和应对措施,钢模台车对提高施工速度、保证施工质量所发挥的重要作用.     

Y型偶氮旋光聚合物的合成及热光性能研究

以对硝基苯胺、亚硝酸钠和苯胺为原料,采用重氮-偶合反应方法,合成有机生色分子:4-(4′-硝基-苯基二氮烯基)-苯胺(NABA)。以偶氮二异丁腈(AIBN)为引发剂,将NABA、手性试剂L-(-)-酒石酸、丙烯酰氯和甲基丙烯酸乙酯制备Y型偶氮旋光聚合物(PMEA)。利用傅里叶红外光谱和紫外-可见光谱等分析手段对所合成的NABA和PMEA进行了结构表征。采用示差扫描量热(DSC)和热失重分析(TG)对该聚合物的热稳定性进行了表征。DSC和TG结果显示,该聚合物的玻璃化转变温度为95.4℃,在5%的热失重温度为185℃,表明具有较好的热稳定性。测定了材料在不同温度的折射率(n)和热光系数(dn/dT);通过热光系数的测量,计算了聚合物的介电常数(ε)、介电热光系数(dε/dT)、体积热膨胀系数(β)和体积热膨胀系数变化率(dβ/dT)。该旋光聚合物材料的热光系数值为-3.031 43~-3.817 14×10-4℃-1,对研制新型热光开关具有一定的意义。     

Aeroservoelastic model based active control for large civil aircraft

A modeling and control approach for an advanced configured large civil aircraft with aeroservoelasticity via the LQG method and control allocation is presented.Mathematical models and implementation issues for the multi-input/multi-output(MIMO) aeroservoelastic system simulation developed for a flexible wing with multi control surfaces are described.A fuzzy logic based optimization approach is employed to solve the constrained control allocation problem via intelligently adjusting the components of output v...     

Fold-Hopf bifurcation in a simplified four-neuron BAM (bidirectional associative memory) neural network with two delays

The bidirectional associative memory (BAM) neural network with four neurons and two delays is considered in the present paper.A linear stability analysis for the trivial equilibrium is firstly employed to provide a possible critical point at which a zero and a pair of pure imaginary eigenvalues occur in the corresponding characteristic equation.A fold-Hopf bifurcation is proved to happen at this critical point by the nonlinear analysis.The coupling strength and the delay are considered as bifurcation parame...     

永磁球形多自由度电机研究进展综述

简述了永磁球形多自由度电机的优越性能,首次提出了永磁球形多自由度电机的分类,重点介绍了国内外的永磁球形多自由度电机最新研究进展和研究中遇到的问题,并探讨了永磁球形多自由度电机的发展前景和趋势。最后在三维有限元软件环境中对一种永磁球形三自由度电机的转矩特性进行了仿真计算,给出了仿真结果,对电机转矩特性进行了分析和讨论。     

基于TCP/IP的家庭能耗监控系统

针对家庭用户无法了解家庭内部具体用电情况的现状,提出了一种基于TCP/IP协议的家庭能耗监控系统。详细阐述了该系统的总体设计框架,给出了系统的硬件电路以及软件设计流程。该系统能够实现家庭能耗的实时监测与控制,具有免布线、组网简单、成本低等优点。