一个实用的WIN95启动界面

本文通过用简单的方法修改ＭＳＤＯＳ．ＳＹＳ和重新配置ＡＵＴＯＥＸＥＣ．ＢＡＴ文件。     

焊接过程电信号在线监测研究现状及发展趋势

详细介绍了各种在线监测和分析方法在焊接过程电信号监测以及焊接质量评估中的应用，分析每一种在线监测方法的特点和焊接质量方面的应用现状。对各种在线监测方法在焊接质量监测中应用的发展趋势进行了分析和预测。     

某圆周缝型救生伞的充气性能研究

为获得新型圆周缝结构救生伞的充气性能,文章采用任意拉格朗日欧拉流固耦合方法对该救生伞进行了充气过程的数值模拟,用空投试验结果验证了该数值方法的可行性。数值结果得到了绕伞衣流场、伞衣外形、运动的动态信息,对数值结果的分析发现初始充气阶段后期流场对上部伞衣影响很大,为充气过程中上部伞衣的控制提供了依据,但是初始充气期救生伞的摆动角度小于充满期。对于结构透气量不对称设计的伞衣,不对称充气是绝对的,圆周缝会首先在结构透气量少的部位张开。结果表明,对不同的圆周缝节点设计不同的开缝力将有助于保持良好的对称充气状态,改变开缝力的设计参数将会改变圆周缝的开缝时间及圆周缝完全张开所需的时长,将达到更好的减载效果。研究结果对圆周缝型降落伞的优化设计有一定的参考作用。     

一种适用于军机总装的产品质量先期策划流程研究

在军用飞机总装阶段存在质量管控与业务流程脱节、质量先期策划不足导致的管控成本较高等问题。为解决这些问题,基于国际航空质量组织APQP 应用指南,改进并提出适用于军用飞机总装阶段的APQP 应用指南（MAFA-APQP）,包括理论模型、核心内容以及关键要素等;以航空发动机安装为对象,验证军用飞机总装APQP 在工艺流程优...     

Gray bootstrap method for estimating frequency-varying random vibration signals with small samples

During environment testing, the estimation of random vibration signals （RVS） is an important technique for the airborne platform safety and reliability. However, the available meth- ods including extreme value envelope method （EVEM）, statistical tolerances method （STM） and improved statistical tolerance method （ISTM） require large samples and typical probability distri- bution. Moreover, the frequency-varying characteristic of RVS is usually not taken into account. Gray bootstrap method （GBM） is proposed to solve the problem of estimating frequency-varying RVS with small samples. Firstly, the estimated indexes are obtained including the estimated inter- val, the estimated uncertainty, the estimated value, the estimated error and estimated reliability. In addition, GBM is applied to estimating the single flight testing of certain aircraft. At last, in order to evaluate the estimated performance, GBM is compared with bootstrap method （BM） and gray method （GM） in testing analysis. The result shows that GBM has superiority for estimating dynamic signals with small samples and estimated reliability is proved to be 100% at the given confidence level.     

Transient simulation of regression rate on thrust regulation process in hybrid rocket motor

The main goal of this paper is to study the characteristics of regression rate of solid grain during thrust regulation process. For this purpose, an unsteady numerical model of regression rate is established. Gas–solid coupling is considered between the solid grain surface and combustion gas.Dynamic mesh is used to simulate the regression process of the solid fuel surface. Based on this model, numerical simulations on a H2O2/HTPB(hydroxyl-terminated polybutadiene) hybrid motor have been performed in the flow control process. The simulation results show that under the step change of the oxidizer mass flow rate condition, the regression rate cannot reach a stable value instantly because the flow field requires a short time period to adjust. The regression rate increases with the linear gain of oxidizer mass flow rate, and has a higher slope than the relative inlet function of oxidizer flow rate. A shorter regulation time can cause a higher regression rate during regulation process. The results also show that transient calculation can better simulate the instantaneous regression rate in the operation process.     

复合材料夹层结构在航空领域的应用

详细描述了复合材料夹层结构及几种常用芯材的性能特点,综合分析了复合材料夹层结构在飞机上的应用案例,对各种夹层结构芯材成型工艺的重点、难点进行了探析,得到了复合材料夹层结构的性能概况及使用工艺要求,可为复合材料夹层结构设计、制造提供参考。     

S形蒙皮零件成形工艺

通过运用S3F软件对S形蒙皮拉形过程进行模拟仿真分析,评估S蒙皮拉形工艺性;预测拉形过程中将产生的缺陷;制定合理工艺方案;优化零件设计和模具结构;实现了该蒙皮零件在数控蒙皮拉伸机上的拉形。     

大尺寸复合材料RTM波纹梁设计优化

为了对使用Resin Transfer Molding(RTM)工艺制造的大尺寸复合材料波纹梁进行结构减重设计优化,运用CATIA软件复合材料设计模块对大尺寸波纹梁进行多厚度分区设计,并编制FORTRAN软件二次开发程序对波纹梁铺层角度和顺序进行优化,进行静强度计算,设计并进行波纹梁剪切试验,制造的波纹梁在某型飞机上成功应用并取得了明显的减重效果。     

复合材料工艺的适航审定

阐述并解析了运输类飞机适航规章对结构制造方法的内在要求,介绍了复合材料工艺适航审查的流程、验证级别、验证所需考虑的要素,以及为表明对适航规章的符合性,复合材料工艺规范应包含的必要组成部分以及各部分的编制要求。