Effect of cold-working on corrosion induced damage in lug joints

Lug joints are preferred joineries for transferring heavy loads to parent components in aerospace vehicles.They experience corrosion due to environmental conditions,improper surface finishes and rubbing displacement between the pin and lug-hole.This causes damage of different sizes and shapes near the lug-hole.Stiffness degradation due to corrosion-induced damage is modelled as a through-pit at one of the identified critical locations through stress analysis.The effect of this pit on fatigue crack initiation life is estimated.Lug-hole is pre-stressed by cold-working and the benefits of inducing plastic wake on the intended performance of the lug joint during the damages due to corrosion are brought out and compared with non-cold-worked lug-hole.Numerical analysis is performed on this lug joint with pressfit.The results obtained highlight the benefits of cold-working and the methodology can be extended to damage growth and analyse the effect of surface treatments for better structural integrity of components of aerospace vehicles.

lug-down测试的不透光烟度数据采集设计

以不透光测试理论与lug-down(加载-减速)测试为基础,提出了在烟度测试过程中必须进行零点标定、线性检查,在采集数据中采用了抗干扰处理和实时修正。设计了消除零点标定误差的算法,提出了线性度检查的方法和范围,给出了烟度数据采集的IIR滤波计算方法及步骤,设计了一个独立的参考通道监测发光源强度,从而对采集数据进行实时修正。该采集方法用于实际测试中,较好地满足了lug-down测试要求。

拟南芥和大白菜LUG蛋白家族的生物信息学分析

LUG蛋白属于WD40超家族基因,具有7个重复的WD40结构域,参与花器官的发育。本项研究系统鉴定了7个拟南芥和5个大白菜的LUG基因,并对这些基因编码的蛋白质序列进行了序列保守性和系统进化分析。结果表明,除了AtLUG6含有5个重复的WD40结构域之外,其余所有的LUG蛋白都具有7个重复的WD40结构域。在进化上,LUG蛋白家族可分为两个不同的亚家族,并且这种特征在拟南芥和大白菜分离之前就已经形成。

基于LuGre模型的航空光电稳定平台的摩擦力矩补偿

为降低摩擦对航空光电稳定平台视轴精度的影响,提出了一种基于LuGre模型的摩擦力补偿方法。首先,对某型光电稳定平台进行分析并建立模型;然后,参数辨识确定摩擦补偿模型;并通过仿真实验验证了摩擦模型的准确性;最后,将摩擦补偿模型应用到光电稳定平台上进行实验。实验结果表明,当平台以1°,1 Hz的正弦运动时,采用基于LuGre模型的摩擦补偿后,系统在低速时出现爬行现象明显减弱。在模拟飞行转台中以2.5 Hz以内任意频率正弦扰动的作用下,加入摩擦补偿后系统的扰动隔离度至少提高了10.99 dB,最优情况已经达到16.90 dB,满足高精度光电稳定平台的性能要求。

钢架自行车的Lug工艺、美学与创新

作为当前社会的一大热点,自行车产品在强调环保和智能的新环境下重新获得公众的高关注度,其实它早已经历了超过百年的发展史。和很多行业一样,自行车也经WORKSHOP教学众瞩目的焦点,在环法比赛,奥运会比赛和其他顶尖赛事中大放光彩,也代表了整个自行车产业的性能、技术和美学巅峰。