基于虚拟切片的三维无损测量装置系统误差分析与研究

发布时间：2018-03-25 04:19

本文选题：误差分析　切入点：测量系统　出处：《桂林电子科技大学》2015年硕士论文

【摘要】：基于虚拟切片的三维无损测量装置由测量系统和控制系统组成。其中测量系统主要由精密进给机构、测力机构、配重调平机构和定位装夹机构组成,控制系统由上位机和下位机部分组成。我们把整个系统的误差分为测量系统误差和控制系统误差,并对整个系统的误差进行了分析和研究,为提高和改进系统精度提供了重要的依据。本论文以基于虚拟切片的三维无损测量装置产生的误差为主线,从测量系统误差和控制系统误差两个方面,对整个系统的误差进行了分析与研究。首先,研究了测量系统的误差组成,通过实验和理论详细分析了精密进给机构、测力机构、配重调平机构、定位装夹机构的误差,得出了测量误差主要由五个方面引起:精密进给机构的定位误差、测力仪器自身误差、测力结构的误差、支点与承载面间摩擦引起的误差、温度引起导轨梁两端臂长变化引起的误差;研究了控制系统的误差组成,分析了下位机的误差,得出了其误差主要来源于PLC控制器引入的误差和控制系统机械部分摩擦引起的误差;分析了上位机的误差,得出了其误差主要来源于定时器Timer控件的定时误差和测量控制软件的机械性带来的误差。其次,基于误差合成理论,对测量系统的误差进行合成,得出了测量系统的测量误差为0.014554g;同时对控制系统的误差进行合成,得出了控制系统的定位误差为0.006747mm;通过实验分析,得出本文对系统误差的分析是合理的。最后,通过实验分析了实验装置的精度,得出了测量系统和控制系统的误差范围;基于对测量系统各组成部分的误差分析结果,提出了提高测量系统各组成部分精度的措施;基于对控制系统误差的分析结果,提出了控制系统误差的补偿方法。
[Abstract]:The 3D nondestructive measurement device based on virtual slice is composed of measurement system and control system. The measuring system is mainly composed of precision feed mechanism, force measuring mechanism, weight leveling mechanism and positioning clamping mechanism. The control system is composed of upper computer and lower computer. The error of the whole system is divided into measurement system error and control system error, and the error of the whole system is analyzed and studied. It provides an important basis for improving and improving the accuracy of the system. In this paper, the error caused by the 3D nondestructive measuring device based on virtual slice is taken as the main line, and the error of the measurement system and the control system are two aspects: the error of the measurement system and the error of the control system. The error of the whole system is analyzed and studied. Firstly, the error composition of the measurement system is studied, and the errors of precision feed mechanism, force measuring mechanism, weight leveling mechanism and positioning clamping mechanism are analyzed in detail through experiments and theories. It is concluded that the measurement error is mainly caused by five aspects: the positioning error of the precision feed mechanism, the error of the force measuring instrument itself, the error of the force measuring structure, the error caused by friction between the fulcrum and the bearing surface, and the error caused by the friction between the bearing surface and the bearing surface. The error caused by the change of arm length at both ends of the guideway beam caused by temperature, the error composition of the control system and the error of the lower computer are studied. It is concluded that the error mainly comes from the error introduced by the PLC controller and the error caused by the friction of the mechanical part of the control system, and the error of the upper computer is analyzed. It is concluded that the error mainly comes from the timing error of the timer Timer control and the error caused by the measurement control software. Secondly, based on the theory of error synthesis, the error of the measurement system is synthesized. The measurement error of the measurement system is 0.014554g, and the error of the control system is synthesized, and the positioning error of the control system is 0.006747mm. through the experimental analysis, it is concluded that the analysis of the system error in this paper is reasonable. The error range of the measurement system and the control system is obtained through the experimental analysis of the accuracy of the experimental device, and based on the error analysis results of the various components of the measurement system, the measures to improve the accuracy of each component of the measurement system are put forward. Based on the analysis of the error of the control system, a compensation method for the error of the control system is proposed.
【学位授予单位】：桂林电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH878

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