激光冲击强化对钛合金高温微动疲劳寿命的影响

为了解高温工作环境下激光冲击强化工艺(LSP)对钛合金材料微动疲劳寿命的影响,开展了强化前后TC11钛合金在室温、300°C和500°C下的微动疲劳试验并测试了试验件表层的残余应力及硬度。结果表明:随着温度的升高,激光冲击强化对TC11钛合金微动疲劳寿命的提高倍数逐渐减小。在轴向载荷为400MPa,法向载荷为65.5MPa时,经激光冲击强化后TC11钛合金试验件在室温、300°C和500°C下的微动疲劳寿命分别为强化前的5.5倍、3.5倍和1.7倍;强化后试验件表层的残余应力会在高温下发生松弛,且松弛程度会随温度的升高而增大,这是激光冲击强化效果随温度升高而逐渐弱化的主要原因。     

中国民用飞机燃油测量系统现状与发展趋势

数字化、综合化是包括燃油系统在内的所有机载设备系统发展的必然趋势,并且正在逐步进入工程应用。因此,我国必须瞄准世界燃油测量技术的先进水平,紧跟其发展方向,大力发展以机载计算机为中心,实现燃油测量、加油控制、输供油控制等功能子系统集成于一体,以总线形式与飞控、航电等功能系统进行信息交换,实现资源的共享,最终形成未来飞机的系统大综合。     

EBE技术在结构分析中的应用（Ⅰ）─EBE矩阵向量乘积方法及其实现

矩阵向量乘积运算是数值分析领域中的一种基本运算。本文基于单元分组技术，提出了在有限元结构分析中，当不形成总刚度矩阵而进行矩阵向量乘积的ＥＢＥ计算方法。该方法不仅预处理过程简单，实现容易，而且其并行化、向量化处理都极为直接。同时，数值试验结果还表明了它的有效性。     

对国有企业质量发展的探索

概述了国有企业质量发展面临的问题及解决这些问题的对策;并对国有企业质量发展的重点、模式和指导思想等提出了看法.     

干涉配合构件的应力腐蚀开裂特性

采用恒载荷拉伸实验技术，研究了镀锌３０ＧｒＭｎＳｉＡ锡螺栓干涉配合连接ＬＹ１２－ＣＺ铝合金构件在３．５％ＮａＣａｌ＋０．５％Ｈ２Ｏ２溶液中的应力腐蚀开裂特性。结果表明，随干涉量的增加，应力腐蚀敏感性有所下降，基材与紧固件的电偶效应对应力腐蚀繁感性有重大影响。     

星用非金属材料出气污染性质原位测试设备研制

成功研制了星用非金属材料出气污染性质原位测试设备， 可原位、连续、定量测试星用非金属材料出气可凝挥发物，给出全过程的出气数据。测试系统稳定、测试仪器灵敏、最小可检达４．４×１０－ ８ｇ／ｃｍ ２。是我国目前唯一的多功位星用非金属材料出气污染高灵敏度原位测试设备。     

Determination of optimal samples for robot calibration based on error similarity

Industrial robots are used for automatic drilling and riveting.The absolute position accuracy of an industrial robot is one of the key performance indexes in aircraft assembly,and can be improved through error compensation to meet aircraft assembly requirements.The achievable accuracy and the difficulty of accuracy compensation implementation are closely related to the choice of sampling points.Therefore,based on the error similarity error compensation method,a method for choosing sampling points on a uniform grid is proposed.A simulation is conducted to analyze the influence of the sample point locations on error compensation.In addition,the grid steps of the sampling points are optimized using a statistical analysis method.The method is used to generate grids and optimize the grid steps of a Kuka KR-210 robot.The experimental results show that the method for planning sampling data can be used to effectively optimize the sampling grid.After error compensation,the position accuracy of the robot meets the position accuracy requirements.     

电子信息系统复杂电磁环境效应研究初探

电子信息系统复杂电磁环境效应是指复杂电磁环境对电子信息系统的影响,是一个涉及社会和国防多个应用领域的重要问题.从电子信息系统复杂电磁环境效应概念出发,首先与电磁环境效应概念进行了比较分析,继而将研究分解为复杂电磁环境特性与模拟、复杂电磁环境综合效应机理和电子信息系统效能评估理论三个方面,最后给出了这三个方面的具体研究思路,并探讨了开展研究的一般性方法.     

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.