基于遗传算法的圆度误差评估

将遗传算法应用于圆度误差的评定.首先简介了误差评定背景和遗传算法及其特点.然后根据尺寸和公差的数学定义^[1]给出满足最小区域条件的圆度公差评定的数学模型和适应度函数.接着,以最小二乘解作为初始值,对圆度误差的遗传优化过程进行了详细的论述.最后用实例对算法进行验证.优化过程和实验结果显示了遗传算法在解决形状公差的评定这类非线性问题的优越性,通过并行搜索能最大限度地保证解的全局最优,计算精度高、效率高,且易于理解和实现.     

改善多步法谐波抑制的新方法——鉴相法

分析了回转基准中存在的问题和多步法误差分离技术的原理误差,提出鉴相法误差分离技术。该技术较显著地扩展了无谐波抑制范围,且使测量过程和测量系统大为简化,是建立纳米精度回转基准的一种较理想方法。     

基于空气轴承的高精度圆度测量系统设计

利用高精度空气静压轴承和非接触位移传感器,设计了一套圆度测量系统,可以实现外圆柱面圆度的精密测量。该系统的圆度测量结果与英国TaylorHobson公司的高精度圆度仪测量结果对比表明,可以达到0．1μm以下的测量精度。多次测量证明,该系统测量结果重复性好、可信性高。     

模糊圆理论介绍与探讨

模糊圆理论是美国Ｃｒｅｉｇｈｔｅｎ大学教授Ｓｈｉｈ－ｑｕａｎ Ｃｈｅｎ来我院短期讲学期间提出的一种新理论。该理论基于模糊数学和传统集合论的观点，对二维平面上的简单闭合曲线图进行研究，提出了模糊圆的概念及相关定义，给出了相关定理及证明。本文对这一理论的主要内容作概要介绍，并针对理论中的某些问题提出笔者的观点及修改结果。     

SrTiO3陶瓷中晶粒三维形状的评估方法

根据SrTiO3陶瓷中晶粒以{100}和{111}晶面为主要晶界的结晶习性,以及晶粒形状随{100}和{111}占晶界面积不同而发生变化的特点,设计了适合SrTiO3晶粒形状特征的晶粒模型.通过对不同形状晶粒的仿真切割,可得到所对应形状晶粒的随机截面,以及能够反映晶粒形状变化的截面形状参数--圆形度.从而建立了晶粒截面圆形度与晶粒形状的关系.在实际应用时,通过测量统计SrTiO3陶瓷切片上晶粒截面圆形度的平均值,来查询晶粒的三维形状.     

A circularity measurement toolkit for manufacturing SMEs

The development and adoption of the concept of circular economy in the last two decades have been remarkable. However, despite its widespread adoption, little progress has been made regarding its measurement, especially in manufacturing SMEs. This paper, therefore, proposes a Circularity Measurement Toolkit (CMT) which enables the assessment of the degree of circularity in manufacturing SMEs. A conceptual CMT framework, which provided the basis for the proposed tool and that defined the different types of circular practices and a classification or levels of circularity was developed from an extensive literature reviewed. To ensure the structure's accuracy of the proposed CMT in terms of requirements to be measured, the monitoring process and actions involved, the tool was verified through a Delphi-study. Furthermore, its practicality was validated through a case study approach in a manufacturing SME. This paper contributes by filling a gap in the CE measurement field through the proposal of the CMT. Besides providing an evaluation of the degree of circularity in the practices of manufacturing SMEs, companies can also employ the proposed CMT to identify corrective actions or future efforts for the adoption of CE practices.     

Characterizing Shape of Effluent Particles by Image Analysis

Abstract

Particle shape of wastewater effluents were investigated by implementing a dynamic particle image analyzer which provided data on the particle count, size, shape and circularity concurrently with images. The goals of this study were to characterize removal efficiency based on size and shape parameters for an in‐line filtration process and to study correlation between size and shape parameters. Results showed that filter removal efficiency can be determined by various size and shape parameters, where different information is obtained for each analysis. This method has potential in evaluating treatment process efficiencies by coupling size and shape parameters into a meaningful tool.     

基于消除背景的人脸定位方法

针对在人脸定位中图像背景对人脸定位产生影响的问题,提出通过消除背景的人脸定位方法.研究了图像区域的肤色特征和几何特征,对背景区域的几何特性进行分类,根据不同的几何特征采用相应的检测方法,有效地去除了人脸背景,实现快速人脸定位.实验结果证明,这种通过消除背景的人脸定位方法能够提高定位的效率和精度.     

BJ2021半轴形位误差自动测量系统的研制

为了满足生产上的急需,研制成功的ＢＪ２０２１半轴形位误差自动测量系统,包括高准确度ＸＷ－２５０测量仪、步进电机驱动装置、数据自动采集接口及数据处理软件．本文论述了系统各组成部份的技术性能及特点,并分析估算了系统的测量准确度．     

单凸轮滑片式供料机构的研究与智能化设计

阐述了目前在食品加工设备中普遍采用的单凸轮滑片式定量供料机构的原理、构成与设计计算方法,并给出了该机构定子内廓曲线设计计算函数式以及轨迹设计合理性的校验与该机构的计算机辅助设计用程序框图。