波音757客改货新机组登机门的加装调节

介绍了新机组登机门的概况,以及加装调节过程中的难点和创新点,总结改装经验,为类似改装提供解决问题的方法和思路。     

弧线齿面齿轮齿面接触分析

为了提高面齿轮副的强度并解决其磨齿问题,提出了弧线齿面齿轮副的一种新的加工方法,并研究其啮合特性.用有刀倾的刀盘旋转而成的切削面作为假想齿轮的齿面,模拟产形齿轮和被加工齿轮啮合过程.推导弧线齿面齿轮副齿面方程;根据两齿面在啮合过程中连续相切条件.建立了考虑安装误差的轮齿接触分析(TCA)模型;齿轮副计算机啮合仿真结果表...     

辅助摩擦电铸Ni-Mn合金的力学性能

利用一种新的电铸技术--游离粒子辅助摩擦电铸技术进行Ni-Mn合金的电铸试验.研究了工艺参数对Ni-Mn合金电铸层显微硬度和拉伸性能的影响规律.试验结果表明,游离粒子的辅助摩擦作用和电铸层中的锰元素共同影响着电铸层的力学性能.随着阴极旋转速率的提高,电铸层中锰含量不断增加,且游离粒子对电铸层的摩擦、挤压作用随之加强,电...     

损伤力学模型在胶接结构耐久性/损伤容限分析中的应用

介绍了胶接结构胶层在简单加卸载情形下的损伤演化本构模型及其数值计算方法的国外研究工作,并对其在胶接结构的耐久性／损伤容限工程评估中的应用进行了分析评述,目的希望推动国内在航空胶接结构设计分析中的应用研究工作。     

Aircraft vulnerability modeling and computation methods based on product structure and CATIA

Survivability strengthening/vulnerability reduction designs have become one of the most important design disciplines of military aircraft now. Due to progressiveness and complexity of modern combat aircraft, the existing vulnerability modeling and computation methods cannot meet the current engineering application requirements. Therefore, a vulnerability modeling and computation method based on product structure and CATIA is proposed in sufficient consideration of the design characteristics of modern combat aircraft. This method directly constructs the aircraft vulnerability model by CATIA or the digital model database, and manages all the product components of the vulnerability model via aircraft product structure. Using CAA second development, the detailed operations and computation methods of vulnerability analysis are integrated into CATIA software environment. Comprehensive assessment data and visual kill probability Iso-contours can also be presented, which meet the vulnerability analysis requirements of modern combat aircraft effectively. The intact vulnerability model of one hypothetical aircraft is constructed, and the effects of redundant technology to the aircraft vulnerability are assessed, which validate the engineering practicality of the method.     

Auto-normalization algorithm for robotic precision drilling system in aircraft component assembly

A novel approach is proposed to detect the normal vector to product surface in real time for the robotic precision drilling system in aircraft component assembly, and the auto-normalization algorithm is presented based on the detection system. Firstly, the deviation between the normal vector and the spindle axis is measured by the four laser displacement sensors installed at the head of the multi-function end effector. Then, the robot target attitude is inversely solved according to the auto-normalization algorithm. Finally, adjust the robot to the target attitude via pitch and yaw rotations about the tool center point and the spindle axis is corrected in line with the normal vector simultaneously. To test and verify the auto-normalization algorithm, an experimental platform is established in which the laser tracker is introduced for accurate measurement. The results show that the deviations between the corrected spindle axis and the normal vector are all reduced to less than 0.5°, with the mean value 0.32°. It is demonstrated the detection method and the auto-normalization algorithm are feasible and reliable.     

基于数字化协同制造的飞机装配工艺设计

介绍了基于数字化协同设计环境的飞机数字化装配工艺设计技术在某机型工艺设计工作中的应用情况及成果,论述了飞机数字化装配工艺设计方法的实施及应用前景。     

应用TESTWORK3.02软件测试不锈钢带的力学性能

介绍了用ＴＥＳＴＷＯＲＫ３．０２测试软件对不锈钢带力学性能的测试过程。从而获得了不锈钢带的弹性模量、抗拉强度、非比例伸长应力、断后伸长率等指标。     

一种先进的直升机动部件综合系统动力特性综合试验技术

由旋翼/传动/发动机/操纵组成的动部件综合系统的动力特性,直接关系到直升机的飞行安全、整机的振动水平、乘员的舒适性、各部件仪表的工作环境和使用寿命,是决定当代直升机先进程度最主要的因素之一。如何获得该综合系统的真实动力特性,是型号研制过程中非常关键的问题。本文将简单介绍一种先进可靠的、能获得该综合系统真实动力特性的综合试验技术。     

Sb对AE41镁合金组织和性能的影响

研究了Sb元素对AE41(Mg-4A l-1RE)镁合金组织和性能的影响。结果表明,加入Sb后基体中出现了弥散颗粒质点。该颗粒质点相主要为RE2Sb相,但当含Sb量较高时,该颗粒质点主要为RE2Sb相和RESb相的复合物。随着Sb加入量的增加,枝条状A l11RE3相在数量降低的同时在形态上逐渐变短变细,弥散RE-Sb颗粒质点数量和尺寸增大,晶界处零星散布离异共晶β相的数量也提高。加入Sb改善了合金的流动性。合金的拉伸强度、塑性、硬度和冲击韧性随着含Sb量的增加而提高,但Sb含量过大时合金的综合力学性能下降。