薄壁型钢几何缺陷测量系统研制及试验研究

【作者】 陈龙；

【导师】 袁军堂；

【作者基本信息】 南京理工大学 ， 机械工程， 2013， 硕士

【摘要】 随着科学技术水平的发展,冷弯薄壁型钢作为一种节能环保的新型材料受到各行各业的高度关注,其性能分析已成为目前最重要的试验项目之一。几何缺陷对冷弯薄壁型钢的性能具有很大影响,因此,对冷弯薄壁型钢的几何缺陷进行测量具有重要的研究价值。基于某一实验室用冷弯薄壁型钢屈曲试验研究,对薄壁型钢几何缺陷测量系统进行设计研究。薄壁型钢几何缺陷测量系统利用激光位移传感器测量被测点的径向坐标值,PLC控制两个步进电动机分别确定被测点的周向和轴向位置,获得被测点的三维坐标,通过测量物体表面大量的测点获得被测试件的三维几何形貌。根据薄壁型钢几何缺陷测量系统的设计指标和工作原理,对其机械结构和控制系统两部分进行具体地设计及说明,并且利用SolidWorks软件建立三维模型,合理规划测量路径,分析引起测量系统误差的主要因素,最后对测量系统进行标定实验。实验结果表明,本测量系统的重复性误差小于0.4%,测量误差小于0.2mm,符合测量系统的设计指标,验证了测量系统设计的合理性。更多还原

【Abstract】 With the development of science and technology, cold-formed thin-wall steel has got highly attention of all walks of life as a new type of materials. It’s energy-saving and environmental, and its performance analysis has been one of the most important testing programs. Geometrical imperfection has great influence on the performance of the cold-formed thin-walled steel. Therefore, it has important significance to researching on the measurement of cold-formed thin-wall steel’s geometrical imperfection.Based on the buckling testing research of cold-formed thin-wall steel in laboratory, a measurement system is designed to measure the geometrical imperfection of cold-formed thin-wall steel. In this measurement system, a laser displacement sensor is used to measure the radial coordinate values,and a PLC is used to control two stepper motors to get to the right measuring position. The three-dimensional geometric shape of the test piece is formed by measuring lots of measured points.According to the design parameters and theory of the measurement system, the mechanical structure and control system are designed and described in detail.The three-dimensional model of the measurement system is established in SolidWorks. Measuring path is reasonable planned and main factors which lead to measuring error are analyzed.Then calibration experiment is conducted on the measurement system.The experimental results show that the repeatability error of the measurement system is less than0.4%and the measurement error is less than0.2mm. The results conform to the design index, verify the rationality of the measurement system.更多还原