论文标题:大口径埋地管道超声波在线管壁测厚系统的研究
Subject of an Ultrasonic Detecting System to Wall Thickness of Large-diameter Underground Gas Pipe
论文作者 苏璐
论文导师 陈娟,论文学位 硕士,论文专业 控制理论与控制工程
论文单位 北京化工大学,点击次数 134,论文页数 83页File Size4756k
2005-05-29论文网 http://www.lw23.com/lunwen_341471487/ 超声波;轮式探头;管道检测;51单片机
ultrasonic; The roller ultrasonic focusing probe; pipe detection; MCU 51
管道运输已经成为全国五大运输行业之一,在国民经济和生产中占有重要的位置,目前西部大开发的“西气东输”重大工程已经全面开工,十五期间共有近2万公里的“西气东输”管网将建成。据管道工程部门调查,埋地输气管道在使役之中的腐蚀孔洞、应力裂纹始发经常不是在外表面,而是在其内部。因此管道内部检测比管道的外部检测就显得更加重要,此外由于腐蚀等原因,地下管道的壁厚会逐渐变薄,严重影响了管道使用时的安全性,目前采用的方法是定期更换全部管道,造成极大浪费,因此研制一套检测系统以解决上述问题,有非常重要的应用价值。 本课题中设计了一套轮式自行走车检测装置,该装置适用于直径存20cm左右的埋地输气管道。行走车的车体由万向节连接的多节套筒组成。各种检测设备分别安装在每个套筒上。研究过程中设计的超声波轮式探头,发出超声波信号测量管道壁厚。轮式探头内部使用了用来加强信号强度的聚焦探头。该装置在管道内部进行检测时,不需要与外界联系,检测数据分别被存储在摄像机和存储芯片里。自身携带的单片机里存有控制程序,完成对行走车的控制,超声波信号的处理
Gas transportation has become one of the five biggest transportation businesses which plays an important role in national economy and production. At present gas transfer project from western to eastern has been started roundly. During the Tenth-Five Plan, nearly twenty thousand Km pipe-net of "gas transfer from western to eastern" were finished. According to the investigation from the pipe-engineering department, most of eroding holes and pressure cracks in underground pipe appear not in the external surface but the inner surface. So detecting the inner pipe is more important than the external of pipe. Besides these, the pipes" wall will be thicker in their usage, which affects the safety of pipe seriously. The present way to solve the problem is to change the whole pipe. But it wastes much money. So it is very important to develop a new detecting system to solve this problem.A set of moveable detecting equipment of car with rollers is introduced in this paper, which is appropriate to pipes with 20cm diameters. The body of the car is composed of sleeve pieces jointed by universal joint. The detecting device are set on each sleeve piece. A roller ultrasonic probe was designed in the subject, and it sends ultrasonic wave to detect the pipe wall"s thickness. In the roller ultrasonic probe is a ultrasonic focusing probe which can strengthen the signal. When this detecting system works inside the pipe independently, programs saved in MCU in the car can control all the moveable car system. At the same time, the data of signal and image of pipe wall are
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