圆度误差测量数据采集系统设计

介绍了自制圆度测量装置的测量原理和自动测量工作过程.提出了一种圆度误差测量数据采集系统,该系统采用非接触电涡流传感器作为圆度误差数据的检测元件,采用高速数据采集卡采集圆度误差数据.试验表明,该系统能够满足数据的高速采集要求.     

基于PVDF传感器的高速圆度测量系统

针对机械加工行业圆度测量高速高效的要求,设计了一种基于聚偏氟乙烯(PVDF)压电薄膜的压电式位移传感器的高速圆度测量系统,利用此传感器高频响、高灵敏度、高信噪比的优势,通过与电荷放大器相结合,实现高速圆度测量.通过实验可知PVDF传感器测量频率响应在1200Hz以上,谐振峰频率在3000 Hz左右,解决了电感传感器在高速圆度测量中测量结果出现失真的问题.测量数据分析结果表明,此系统圆度测量误差可达到1 μm以内.多次测量证明,该系统测量结果重复性好、可信性高.     

基于LabVEWI的圆度误差在线检测系统

针对回转体零件圆度误差的检测和分析,设计了一套与磨削加工同步进行的圆度误差在线检测分析系统。确定系统的总体方案,设计专用测头机构,阐述测量原理。利用Lab VIEW软件平台,对采集到的数据进行滤波处理。采用最小二乘法进行圆度误差评定,实现了圆度误差在线测量。     

虚拟圆度采集系统设计

介绍了一种基于LabVIEW的虚拟圆度采集系统.系统采用自行设计的圆度采集卡,完成圆度数据的测量和数字转换,利用LabVIEW的开发环境实现圆度数据的处理和显示.     

阶梯轴多参数在线测量系统

介绍了微机控制的阶梯轴多参数在线测量系统的测量原理、系统构成及测量误差分析。该系统具有多通道数据自动采集、零位校准、故障诊断等功能 ,可实现阶梯轴直径、同轴度、径向跳动、圆度、椭圆度等的在线测量。     

基于嵌入式圆度测量系统及应用研究

分析现有圆度检测原理和技术,研究嵌入式SPC及在圆度检测系统中的应用.通过对数据采集,数据处理到构造各种工具图形的过程分析,研究SPC整合到圆度测量的可行性,最终把嵌入式SPC用纯软件的方式应用到圆度测量系统中,设计基于嵌入式SPC的圆度测量系统,开发适合工业现场使用的低功耗、高精度、使用方便的圆度测量系统.     

基于激光线扫描三维重构的扩径管道直径及圆度测量方法

为了提高管道在扩径过程中圆度和直径的测量精度及效率,设计了一套基于激光线扫描三维重构的管道直径及圆度测量系统。系统利用激光线扫描传感器对管道外轮廓进行点云数据采集,结合上位机对图像数据进行滤波、去噪及分割,实现扩径管道外轮廓的三维重构,并利用最小二乘法计算重构的扩径管道直径和圆度。实验结果表明,该系统能够实现扩径管道直径及圆度的精准测量。     

曲轴连杆颈圆度误差跟踪测量策略

本文对曲轴连杆颈非圆磨削过程中圆度误差的在线跟踪测量策略展开研究,推导了测量系统跟踪运动方程,针对在频域分析时对3个传感器之间线性相关性的要求,论述了满足均匀采样的约束条件。为了提高圆度误差的在线测量精度,提出了运动状态下三点跟踪圆度误差分离方法,并详细论述了如何选择3个传感器安装角度来有效避免谐波抑制现象的产生。最后使用最小二乘法对进行圆度误差分离后的数据进行计算,并与圆度仪离线测量结果进行对比,结果验证了曲轴连杆颈圆度误差在线跟踪测量策略的正确性。     

基于CPAC的轴承圆度测量仪控制系统

针对轴承的圆度测量,开发了一套以CPAC(computer programmable automation controller)平台为硬件控制核心,以Otostudio为软件平台的轴承圆度测量仪控制系统。该系统采用模块化设计,同时在国际编程IEC61131-3标准下进行运动控制和数据的采集、处理、转换,完成了系统软硬件结合,并用实验方法对该系统进行多次测试,结果表明该系统能有效地测量轴承的圆度误差,并直观地反映在用户界面中。     

虚拟仪器测量系统中的信号采集与处理

文中对基于虚拟仪器圆度和圆柱度测量系统中的数据采集和信号处理进行研究.利用LabVIEW 8.6作为软件开发平台,以PCI-6010数据采集卡、CWY - DO -502电涡流位移传感器以及配套的前置器作为数据采集与处理系统,实现数据的采集、滤波、数据转换,并采用误差分离技术对数据进行处理.此系统作为圆度和圆柱度测量系统中的一个子系统.实验表明:LabVIEW用于数据采集和信号处理,具有程序设计简单、通用性好、人机界面友好,可操作性强等优点.     

Batch circular form error characterization and evaluation

In practice, it is necessary to understand the general quality status of a batch of circular features machined under the same or similar conditions. In particular, it is necessary to understand the possible worst case among such a batch of circular features. To this end, a brand-new concept called “batch circular form error” is presented in this paper. Detailed definitions of batch circular form error including batch circular form error with ideal conditions and batch circular form error with realistic conditions are provided. Accordingly, the evaluation algorithms of batch circular form error are developed. The algorithms include the characterization of the deterministic profile of circular features and the evaluation of batch circular form error based on a given profile confidence level. Case studies with simulation and experimental data are used for demonstration. The results show that the batch circular form error can be estimated with the data measured from any circular feature in the batch, as long as the sample size is large enough and random ratio is not too large.     

Measurement and analysis of typical motion error traces from a circular test

The circular test provides a rapid and efficient way of measuring the contouring accuracy of a machine tool. To get the actual point coordinate in the work plane, an improved measurement instrument - a new ball bar test system - is presented in this paper to identify both the radial error and the rotation angle error when the machine is manipulated to move in circular traces. Based on the measured circular error, a combination of Fourier components is chosen to represent the systematic form error that fluctuates in the radial direction. The typical motion errors represented by the corresponding Fourier components can thus be identified. The values for machine compensation can be calculated and adjusted until the desired results are achieved.     

Measurement and analysis of typical motion error traces from a circular test

The circular test provides a rapid and efficient way of measuring the contouring accuracy of a machine tool. To get the actual point coordinate in the work plane, an improved measurement instrument - a new ball bar test system - is presented in this paper to identify both the radial error and the rotation angle error when the machine is manipulated to move in circular traces. Based on the measured circular error, a combination of Fourier components is chosen to represent the systematic form error that fluctuates in the radial direction. The typical motion errors represented by the corresponding Fourier components can thus be identified. The values for machine compensation can be calculated and adjusted until the desired results are achieved.     

基于ZEMAX的激光光束整形技术试验研究

由于半导体激光器的发散角较大且输出的光束光斑是椭圆形,因此需要对其输出的光束进行空间整形,形成一个近似圆形的激光光斑。激光扩束镜就是一种比较简单且非常方便的激光光束整形器件,本文将激光扩束镜作为一个激光整形系统与半导体激光器耦合,形成一个完整的激光光束整形系统。利用ZEMAX光学仿真,并进行室外试验验证,最后对试验结果进行了分析。     

机电集成静电谐波传动柔轮的应力分析

提出了一种基于静电驱动的新型机电集成传动系统，描述了该传动系统的基本工作原理。通过合理的假设，将传动的柔轮简化为圆柱壳体。把对称作用在壳体上的静电场力展开为Fourier级数形式。在选取合适的位移函数的基础之上，对一端自由一端固定的柔轮进行研究，通过迭代确定相应的待定系数，并最终得到应力沿中曲面的分布规律，为传动的设计和研究提供了有益的参考。     

二次非线性圆板的1/2亚谐解

计及材料的非线性弹性和粘性性质，研究圆板在简谐载荷作用下的1／2亚谐解，导出相应的非线性动力方程。提出一类强非线性动力系统的叠加－叠代谐波平衡法。将描述动力系统的二阶常微分方程化为在本解为未知函数的基本微分方程和分岔解为未知函数的增量微分方程。通过叠加－叠代谐波平衡法得出圆板的1／2亚谐解。同时，对叠加－叠代谐波平衡法和数值积分法的精度进行比较。并且讨论了1／2亚谐解的渐近稳定性。     

高精度圆体成形车刀的CAD/CAM系统

研究了高精度圆体成形车刀优化设计的数学模型，介绍了用VB语言开发的高精度圆体成形车刀的CAD／CAM子系统的构成及其主要模块的功能该系统可由工件零件图直接生成加工该工件的高精度圆体成形车刀的零件图及刀具廓形的数控线切割加工程序，同时还能通过仿真检验所设计的刀具廓形及其加工程序代码的正确性。     

An exact solution for buckling of functionally graded circular plates based on higher order shear deformation plate theory under uniform radial compression

In this research, mechanical buckling of circular plates composed of functionally graded materials (FGMs) is considered. Equilibrium and stability equations of a FGM circular plate under uniform radial compression are derived, based on the higher order shear deformation plate theory (HSDT). Assuming that the material properties vary as a power form of the thickness coordinate variable z and using the variational method, the system of fundamental partial differential equations are established. A buckling analysis of a functionally graded circular plate (FGCP) under uniform radial compression is carried out and the results are given in closed-form solutions. The results are compared with the buckling loads of plates obtained for FGCP based on the first order shear deformation plate theory (FSDT) and classical plate theory (CPT) given in the literature. The study concludes that HSDT accurately predicts the behavior of FGCP, whereas the FSDT and CPT overestimates buckling loads.     

Improvement of metrological characteristics of laser image generators with circular scanning

Possible ways of improving laser image generators based on the circular scanning principle are analyzed. The most important sources of errors induced by the system of radial displacements and by the rotation unit are studied. Principles of decreasing the main components of instability of operation of image generators with circular scanning are described. Owing to the use of some principles, the prototype of such a generator can be put onto the second place in the worldwide rating of systems used by various companies to form structures providing high-accuracy measurements of angles (scales, limbs, rasters, etc.).     

Automated visual inspection of geometric tolerance in circular components

In the manufacture of engineering products circular features are widely used. Roundness is one of the basic form errors encountered in circular features. The analysis of roundness error becomes crucial in the case of automated inspection. This paper presents mathematical models and algorithms to determine the roundness error in circular features using digital vision systems. Different approaches for determining out-of-roundness error are investigated and a proper approach is suggested. A methodology is proposed to determine the out-of-roundness error and number of lobes present in circular components. The proposed algorithm has been implemented and its reliability is reported in the paper