【作者】 孟宪昌；

【导师】 赵军；

【作者基本信息】 燕山大学 ， 材料加工工程， 2011， 硕士

【摘要】 直线度是大型直缝焊管的主要形位误差,直接影响运输管线的安装。实现大型直缝焊管过弯矫直,首先要检测焊管轴线方向各点的挠度。如何快速准确的测量焊管的挠度是一个亟待解决的测量问题。挠度的测量可以用传统方法也可以使用光学方法,相比而言光学方法具有以下优点:非接触、高分辨率、快速反应并且更为准确。本文在了解国内外挠度检测现状的基础上,对大型直缝焊管挠度的检测原理进行了研究,分析和比较了多种检测方案,在此基础上进行了测量装置的总体结构设计。结合大型直缝焊管的尺寸和形状特点,选择了optoNCDT 1302激光反射式位移传感器作为传感器元件。建立了相应的数学模型,完成了测量系统的方案设计和结构设计。以软件开发平台虚拟仪器为出发点,就虚拟仪器的概念、典型结构及产生过程进行了说明,并就虚拟仪器软件平台LabVIEW的功能、特点及使用方法进行了介绍。根据虚拟仪器的设计原则和方法,检测系统采用了模块化设计。详细阐述了大型直缝焊管挠度检测软件系统中主要功能模块的设计和实现。对不同挠度的φ76×800mm直缝焊管进行了挠曲线检测实验。通过对系统进行稳定性实验、重复性实验、三坐标测量仪测量对比实验,验证了大型直缝焊管挠度检测系统的可行性和可靠性。更多还原

【Abstract】 As a major shape error of large-diameter longitudinal seam weld steel pipe, deflection error affects the quality of pipeline’s installation. Before straightening to large-diameter longitudinal seam weld steel pipes, deflection along the axis must be known firstly. How to measure straightness error of weld pipe’s deflection with a high accuracy and a high speed has been a metrology problem which has not been fixed properly by now. Deflection can be measured and surveyed by traditional mechanical methods and optical means. Optical deflection measuring system has the advantages of nor-contact, high resolution, fast response, and so on.To begin with, the measuring principle of deflection for the large-diameter longitudinal seam weld steel pipe is discussed in this paper, which is based on the research of the status in domestic and the trends of overseas in this area. Many measuring methods are analyzed and compared here. According to this, the overall structure of the measuring apparatus has been contrived. With the shape and size characteristic, OptoNCDT 1302 Reflective Laser Displacement Sensor is chosen. The mathematical model has been created accordingly. The structure and scheme designs for the measuring system have been realized.And then taking the Virtual Instrument software as a starting point, the concept, typical structure and development process of Virtual Instrument are illuminated. Also the function characteristics and operation methods of virtual instrument software environment LabVIEW are introduced here. According to the Virtual Instrument ’s principle of design, the system has used the modular design. Then, the realization of the main acquisition and processing functions of deflection detection system program procedures of large-diameter longitudinal seam weld steel pipes are specified detailedly. At last, deflection examinations are carried on with the longitudinal seam welded pipeφ75×800mm with different amount of deflection. Through the experiments of stability, repeatability, measurement data comparison with the Three coordinates measuring machine’s, the feasibility and reliability of the measurement system is testified.更多还原