面向对象建模(UML)的理论分析

本文主要介绍统一建模语言（UML）的产生基础、UML的基本语义；面向对象的机制和过程。     

不同机匣-枪管联结系统的动特性实验

从实验方面对两个具有不同结构形式的机匣－枪管联结系统的动特性作了研究，验证了实验结果和计算结果的一致性，证明了系统结果不同是影响其动特性的主要原因，从而为动特性的优化提供了理论依据。     

基于PHP的动态网页技术的研究与实现

针对ASP、PHP和JSP三种动态网页设计技术，从多方面比较三者的异同，对其应用前景作出展望；并以南昌航空工业学院“启航思想政治教育网站”的设计与实现为例，介绍了PHP和MrSQL开发网页的关键技术。     

近地点变轨固体火箭发动机平衡试验

对长二捆近地点变轨固体火箭发动机动平衡用校验转子、工装、空载／满载发动机、卸载／不卸载发动机以及有无喷管发动机等各种状态下动平衡参数进行了试验研究，并对其动平衡在数进行了理论计算。     

A thermal activation based constitutive model for the dynamic deformation of AA5083 processed by large-scale equal-channel angular pressing

Aluminum alloy 5083 (AA5083) processed by large-scale Equal-channel angular pressing (ECAP) is an excellent engineering material with great prospects for industrial applications. An accurate assessment of the underlying constitutive relationships with easily determined material constants is critical for the predictive design and informed processing of such structural materials. To develop such a design framework, uniaxial dynamic compressive tests over a wide range of temperatures (293–573 K) were carried out for an ECAP-processed AA5083 alloy. Additionally, the microstructure before and after dynamic loading was characterized by SEM and TEM. Based on the experimental results, a new dynamic constitutive model, based on thermal activation theory, was established to describe the plastic flow behavior of the AA5083 alloy that incorporates the effects of plastic strain, temperature, and strain rate. The input parameters of the new model were determined using a particle swarm optimization (PSO) method. The model predictions show excellent agreement with experimental results, which suggests that the current predictive constitutive model is highly effective in reproducing the dynamic deformation behavior of the large-scale ECAP-processed AA5083.     

基于粒子滤波的结构疲劳裂纹扩展动态贝叶斯推断方法

准确预测结构的疲劳裂纹扩展过程是开展飞机单机寿命监控与剩余寿命估算的基础。提出一种基于动态贝叶斯网络的结构疲劳裂纹扩展预测方法,结合疲劳裂纹扩展的先验知识与后验知识来准确地推断裂纹长度;研究粒子滤波算法中不同粒子数对动态贝叶斯网络推断精度的影响规律;通过对单孔板结构与耳片连接结构件在随机载荷谱下进行裂纹扩展研究。结果表明：动态贝叶斯网络方法可以对复杂结构的疲劳裂纹扩展进行准确预测,预测精度相对于传统方法提高50% 以上。     

Experiments on unsteady vortex flowfield of typical rotor airfoils under dynamic stall conditions

A new experiment for airfoil dynamic stall is conducted by employing the advanced particle image velocimetry(PIV) technology in an open-return wind tunnel. The aim of this experimental investigation is to demonstrate the influences of different motion parameters on the convection velocity, position and strength of leading edge vortex(LEV) of airfoil under different dynamic stall conditions. Two different typical rotor airfoils, OA209 and SC1095, are measured at different free stream velocities, oscillation frequencies, and angles of attack. It is demonstrated by the measured data that the airfoil with larger leading edge radius could notably decrease the strength of LEV. The angle of attack(Ao A) of airfoil can obviously influence the dynamic stall characteristics of airfoil,and the LEV would be effectively inhibited by decreasing the mean pitch angle. In addition, the convection velocity of LEV is estimated in this measurement, and the results demonstrate that the influence of airfoil shape on convection velocity of LEV is limited, but the convection velocity of LEV would be increased by enlarging the oscillation frequency. Meanwhile, the convection velocity of LEV is a time variant value, and this value would increase as the LEV convects to the trailing edge of airfoil.     

基于模糊规划的航空公司混合营销渠道协调

为了对航空公司混合渠道进行更有效协调,根据渠道协调特点,运用区间分析法构建了需求不确定情况下航空公司混合渠道协调的模糊规划模型,并对模型进行了多维度数值模拟.结果表明,模型对不确定需求具有鲁棒性,适用于需求不确定下航空公司混合渠道协调;随着分销渠道比例下降,渠道协调鲁棒性呈现先升后降趋势;随着需求区间变大,模糊规划模型的隶属度呈现下降趋势.因此航空公司应适当降低分销渠道比例,同时加强市场调查缩小机票需求不确定区间范围;代理人应选择代理销售需求不确定性低的机票产品,并与航空公司合作适当降低分销渠道比例从而获得鲁棒双赢策略.     

应用位移频响函数进行模型修正

应用相关性分析后试验测量所得的位移频响函数对动力学分析模型的刚度矩阵、质量矩阵、阻尼系数进行修正,使修正后分析模型的频响函数与试验测量所得的相一致.该法不仅修正了动力学分析模型频响函数的峰值响应,还很好地修正了分析模型的固有频率,使得修正后模型峰值响应处的频率与试验测量所得的峰值响应处的频率相一致.该法具有明确的物理意义,数值算例表明,此法方便可行,修正结果精确,工程实际意义较强.     

基于Pro/E的双轴定位机构虚拟样机的建模与校核

介绍了在Pro/E设计平台上完成某卫星天线双轴定位机构虚拟样机模型的建模、仿真与校核。根据该定位机构的特点,建立了虚拟样机模型并完成静态校核。通过设定必要的参数值,对虚拟样机作包括运动学和动力学仿真的动态校核。由仿真结果与规定设计指标的比较可知,该虚拟样机符合设计要求。