摘要：介绍了可用于受损管件现场修复的内衬管环形Nd∶YAG激光深熔焊结构及装置。内衬管设计成内凹状 ,以减小轴向变形拘束度 ,降低焊接残余应力 ,从而降低应力腐蚀倾向。光导纤维将激光导入内衬管内 ,旋转斜面镜将激光反射到内衬管内壁并产生一深熔环形焊道。熔化金属凝固后将内衬管与外管连接在一起 ,并防止液体渗入损坏的外管部分。实验结果表明 ,激光焊母材热影响区晶粒长大较小 ,激光脉冲峰值影响焊缝连接宽度 ,而连接宽度影响拉伸剪切强度。焊接接头的拉伸剪切强度约为Inconel 60 0管拉伸强度的 62 %。

摘要：A control problem of a chain of integrator system with measurement noise on feedback sensor is considered. We propose a gain-scaling controller for compensating measurement noise of feedback sensor. Because control systems operate via feedback sensor＇s signal, the measurement noise in sensor＇ signal results in performance degradation or even system failure. Therefore, control systems often demand on compensating measurement noise. Our controller is equipped with a compensator and gain-scaling factor in order to reduce the effect of measurement noise on feedback sensor.