为保护水下焊接人员的人身安全, 提高焊接电源通断相应时间, 设计开发了一种水下湿法焊接远程遥控装置, 该装置由水下开关组件、水密通讯电缆、陆上控制组件与信号输出插头等构成, 可以实现由潜水员在水下自主操作焊接电源的通断, 最大限度地缩短响应时间.实际应用结果表明, 与传统的大功率闸刀相比, 水下湿法焊接远程遥控装置的指令响应速度由2～4 s缩短到0.2 s以内, 焊接过程中没有出现麻电现象和拉弧现象, 为水下作业提供安全保障和便利.

The experiment course of stud welding in the sea was briefly introduced,the welding strength of studs was tested after welding,and the simulated repairing test for the damaged vessels was done with the stud welding method.The results show that stud welding can be carried out in the sea,the welding quality is reliable,and this method can be used to repair the damaged ships.Simultaneously,the diver should use the full-covered diving apparels to protect himself during underwater stud welding.

1.概述 在沉船打捞及海难救助等水下工程作业中,水下切割技术经常被用于水下救助、切割除障、船体开孔以及附属构件的去除等,如美国"墨西哥湾"漏油堵漏工程及我国的"阿波丸"号沉船打捞工程.而在水下切割技术中,使用最为广泛的便是水下电-氧切割技术,该技术是打捞潜水作业人员必需掌握的水下作业技能之一.在"阿波丸"号沉船打捞工程中,运用水下电-氧切割技术切割船体的总长度超过2 400m,消耗氧气超过2 600多瓶.

According to uncertainty and nonlinear characteristic of missile servo system,a sensor fault diagnosis proposal for a class of nonlinear system is presented.The studied uncertain nonlinear system is with unknown input disturbance.First,a controller is designed based on sliding mode variable structure theory.A design of state observation also based on sliding mode variable structure theory but by use of a specific equivalent control methodology follows.Then,by means of adaptive method,the fault identification which can restructure the faults is studied.The results of some numerical simulations on an artillery position servo system verify the validity of the proposed approaches.

介绍Hammerhead水下湿点焊技术的基本原理、设备及操作方法,并提出采用此方法焊接眼板时的眼板设计方法,计算眼板承受载荷的能力。

在分析远程反舰导弹捕捉能力的基础上,针对海面风场、导弹射击方式、目标规避机动、目标定位精度、目标信息时间延迟对远程反舰导弹捕捉概率的影响进行了分析,并结合实例进行了仿真.

<正>水下氧-弧切割由于操作方便、灵活性强、切割效率较高以及技术掌握相对简单而经常被水下作业所使用。在进行水下氧-弧切割时,平割或立割技术是比较安全方便的,而悬浮切割相对来说比较危险,操作起来也比较困难。我们在对某浮船坞的水下支撑平台进行切割时采用氧-弧切割中的悬浮切割法,取得了成功。

Calculate the GDOP of some certain sea area by using Matlab,compared with the plan of additional navigation station,verifying that the plan can improve the distribution of GDOP,and can improve the navigational accuracy of Alpha system on that sea area.