Underwater hydraulic shock shovel control system

The control system determines the effectiveness of an underwater hydraulic shock shovel. This paper begins by analyzing the working principles of these shovels and explains the importance of their control systems. A new type of control system’s mathematical model was built and analyzed according to those principles. Since the initial control system’s response time could not fulfill the design requirements, a PID controller was added to the control system. System response time was still slower than required, so a neural network was added to nonlinearly regulate the proportional element, integral element and derivative element coefficients of the PID controller. After these improvements to the control system, system parameters fulfilled the design requirements. The working performance of electrically-controlled parts such as the rapidly moving high speed switch valve is largely determined by the control system. Normal control methods generally can’t satisfy a shovel’s requirements, so advanced and normal control methods were combined to improve the control system, bringing good results.     

钢板桩码头的安全与检测

介绍了钢板桩码头的检测内容和相应的检测方法 ,并对检测结果进行了分析。分析得出 ,码头可按原设计荷载继续使用     

管道对口器技术及方案研究

水下油气管道维修是人类开发海洋资源的重要保障,文中对西方发达国家正在研究或使用于铺设、维修管道的对口器进行了综述,并针对海底油气输送管道维修目标提出了一种对口器的总体方案.对于追踪国外先进科技,设计适合维修作业环境的对口器,提高我国水下作业技术有重要的意义.