基于适应性修改的CBR建库中的数据挖掘

研究了从大量的原始数据中挖掘典型和关键事例以进行CBR事例库建造的问题，指出在不同的数据库结构中，其算法不同，没有一个通用的算法能最好地满足所有的领域。并引用适应性修改的概念提供了在CBR中的关键事例的算法。     

航空发动机远程智能故障诊断与维修

通过对军用航空发动机的诊断和维修现状研究，分析了目前建立军用航空发动机远程故障诊断与维修体系的可能性和必要性；提出了以故障智能诊断和维修中心为核心的三位一体的广域维修保障体系；对建立故障智能诊断和维修中心所需的软硬件结构进行了详细论述，并对关键的动态网页服务(ASP)技术、基于事例推理(CBR)技术及网络条件下的综合故障诊断方法指出了进一步研究的方向。     

基于小波神经网络的PID整定与应用

提出了一种基于小波神经网络整定的PID控制方法。由于小波变换具有良好的时频局部特性，神经网络具有强大的非线性映射能力，自学习、自适应等优势，采用规范正交的小波函数作为神经网络的基函数构成小波神经网络。该网络兼有小波函数的紧支性、波动性以及神经网络的非线性映射能力，自学习、自适应能力等优点，渗碳炉控制实验结果表明．用该方法整定的PID控制系统收敛速度快。逼近精度高，鲁棒性好。     

有向图在求解大型非线性方程组中的应用

为了提高大维数非线性方程组的求解品质,该文提出了有向图法,将参数关系转化为有向图,利用有向图求圈算法来精简迭代参数,从而提高计算速度,降低算法发散的可能性。这种方法适用于求解工程化的大维数非线性方程组,可以用计算机自动实现。     

大型有向图的三叉链表式存储结构

为了对大型有向图进行存储,提出了一种三叉链表式的存储结构。它由索引链表、结点链表、连结链表按照一定结构组成。可以较好地满足某些大型有向图的存储要求,具有节约存储空间、算法适用面宽、可维护性好等特点。     

通信机箱加工中6061铝合金对2A12铝合金的可替代性

阐释了6061铝合金与2A12铝合金两种材料的化学性能、力学性能、机加工性能、经济性能,比较其在通信机箱加工中的优缺点,总结实际加工中6061铝合金表现出来的优越性能。经验表明6061铝合金材料满足通信机箱加工中的各种性能要求,并在其生命周期过程中可有效节约能源和资源,通过理论和事实论证了在通信机箱加工中6061铝合金材料替代2A12铝合金材料的可行性。     

等离子体电流体动力激励器的建模与仿真

揭示辉光放电的电特性是进行等离子体电流体动力激励器优化设计的前提,基于PSpice软件对激励器进行了建模与仿真。采用PSpice中的数学宏模型建立了等离子体放电的模型,解决了等离子体电流体动力激励器仿真的关键问题。在此基础上,仿真了对称布局等离子体激励器的宏观电特性,仿真结果符合辉光放电的电压-电流幂律。为进一步仿真和优化激励器的参数打下了基础。     

Experimental Investigation of Hypersonic Flow and Plasma Aerodynamic Actuation Interaction

For hypersonic flow,it was found that the most efective plasma actuator is derived from an electromagnetic perturbation.An experimental study was performed between hypersonic flow and plasma aerodynamic actuation interaction in a hypersonic shock tunnel,in which a Mach number of 7 was reached.The plasma discharging characteristic was acquired in static flows.In a hypersonic flow,the flow field can afect the plasma discharging characteristics.DC discharging without magnetic force is unstable,and the discharge channel cannot be maintained.When there is a magnetic field,the energy consumption of the plasma source is approximately three to four times larger than that without a magnetic field,and at the same time plasma discharge can also afect the hypersonic flow field.Through schlieren pictures and pressure measurement,it was found that plasma discharging could induce shockwaves and change the total pressure and wall pressure of the flow field.     

Experimental Investigation on Airfoil Shock Control by Plasma Aerodynamic Actuation

An experimental investigation on airfoil （NACA64-215） shock control is performed by plasma aerodynamic actuation in a supersonic tunnel （Ma -= 2）. The results of schlieren and pressure measurement show that when plasma aerodynamic actuation is applied, the position moves forward and the intensity of shock at the head of the airfoil weakens. With the increase in actuating voltage, the total pressure measured at the head of the airfoil increases, which means that the shock intensity decreases and the control effect increases. The best actuation effect is caused by upwind-direction actuation with a magnetic field, and then downwind-direction actuation with a magnetic field, while the control effect of aerodynamic actuation without a magnetic field is the most inconspicuous. The mean intensity of the normal shock at the head of the airfoil is relatively decreased by 16.33%, and the normal shock intensity is relatively reduced by 27.5% when 1000 V actuating voltage and upwind-direction actuation are applied with a magnetic field. This paper theoretically analyzes the Joule heating effect generated by DC discharge and the Lorentz force effect caused by the magnetic field. The discharge characteristics are compared for all kinds of actuation conditions to reveal the mechanism of shock control by plasma aerodynamic actuation.     

用Matlab/Simulink仿真等离子体激励器电特性

为了分析产生低温等离子体的单面介质阻挡辉光放电的放电特性及其各参数对它的影响,给低温等离子体在航空流动控制领域的应用提供理论保证,基于辉光放电的唯象学理论,将等离子体放电建模成一个电压控制的非线性电流源,利用Matlab的电力系统模块库PSB建立了此系统的仿真模型;利用Matlab/Simulink仿真了该系统的等离体放电电流的暂态过程;仿真分析了控制电压对电路模型中某一个电压控制的非线性电流源产生的等离子体放电电流的影响。结果表明,仿真波形和实验波形基本一致。该模型和仿真方法有效,便于直观地分析系统性能,可实时显示各参数的变化。