大口径长焦距镜面和透镜的扫描法焦距测量技术

提出了用扫描法测量大口径长焦距镜面或透镜焦距的方法。这种方法是通过对一块Ronchi光栅的Talbot像与另外一个Ronchi光栅所产生的莫尔条纹转角的计量来测量长焦距；通过扫描对大口径范围内的整个区域进行测量。实验结果表明，这种方法能够实时地、非常精确地测量长焦距。     

两种莫尔条纹信号对光栅系统测量精度的影响

对两种莫尔条纹（光闸条纹和横向条纹）信号的谐波含量以及它们对光栅系统测量精度的影响进行了分析，并用实测数据加以比较，指出在光栅系统中，取横向莫尔条纹信号的谐波量小，正弦性好，细分误差小，在其它参数相同的情况下，可提高系统的测量精度2倍左右。     

基于数字图像处理的光切法槽深测量方法研究

在窄浅槽的深度测量方面，常用的测量方法受到很多的限制。对不锈钢管的电火花加工（EDM）的刻槽深度测量，提出了一种在光切法基础上采用电荷藕合器件图像传感器（CCD）获得不锈钢管表面和刻槽底部的图像，运用数字图像处理技术对图像进一步处理的刻槽深度测量方法。介绍了光切法的原理，并详细介绍了对所获得的数字图像进行处理的步骤。实际应用表明，该方法有较高的测量精度。     

基于数字图像的空间目标滚转角测量方法

本文分析了几种摄影状态下空间目标滚转角的测量问题,提出了一种从单站光测数字图像确定目标滚转角的螺旋线法。该方法通过在圆柱形目标表面涂上边界为螺旋线的四区域标志,综合运用直方图均衡化、Susan边缘检测以及Hough变换等数字图像处理技术,从光测图像中得到各个时刻目标中轴线与螺旋线的相交线段的长度,由此可高精度测出空间目标的滚转角,从而有效地解决了靶场试验中空间目标滚转角的测量难题。仿真与实践结果表明,该算法可操作性强,精度较高。     

The economic and economic-statistical designs of the Hotelling's T2 chart based on the expected average run length

Existing economic and economic-statistical designs require practitioners to specify the Mahalanobis Distance Shift Size (MDSS) as an exact value. However, practitioners may find it difficult to specify this distance. This article proposes the economic and economic-statistical designs of the Hotelling's T² chart, where practitioners do not have to specify the MDSS. Adopting optimal design parameters based on the wrong MDSS results in a significant increase in cost. In comparison, adopting the optimal design parameters based on the proposed methodology results in a slight increase in cost. This article also studies the effects of different input parameters and statistical constraints.     

基于背景分类的弱小目标检测算法

为了降低复杂背景对弱小目标探测的影响,本文提出了一种基于背景分类的弱小目标检测算法.背景分类的依据是背景的复杂度,本文用熵运算估计背景的复杂程度,同时为了简化算法,采用多分辨率的小波变换.再用模糊数学中的隶属度函数映射到模糊特征平面,作为背景因子图像.接着对背景因子图像进行最大熵阈值分割,将复杂的地面背景与平坦的天空背...     

An iterative method for coupling of deformation and failure mechanisms on different length scales

An iterative method for coupling of numerical simulations on two length scales is presented. The computations on the microscale and on the macroscale are linked via a suitable macroscopic constitutive law. The parameters of this material law depend on the deformation history and are obtained from simulations using microstructurally representative volume elements (RVEs) subjected to strain paths derived from the associated material points in the macroscopic structure. Thus, different constitutive parameter sets are assigned to different regions of the macrostructure. The microscopic and macroscopic simulations are performed iteratively and interact mutually via the strain paths and the constitutive parameters, respectively. As an example, the strip tension test for a porous material is modelled using the finite element (FE) method. The coupling procedure, the material law and its numerical implementation are described. The method is shown to allow for a detailed simulation of the deformation mechanisms both on the micro‐ and the macroscale as well as for an assessment of their interactions while keeping the computational efforts reasonably low. Copyright © 2000 John Wiley & Sons, Ltd.     

流媒体与图像处理的多工位燃气表检定系统

针对当今国内市场上已有的钟罩式气体流量标准检定装置在小量程检定时存在的检定效率低,时间浪费的问题,该系统提出了一种基于流媒体(DirectShow)与数字图像处理技术的多工位燃气表检定方法,可有效地提高检定效率,使原有的检定系统装置更加完善,自动化的程度更高,使之能在工业上更加广泛的应用.     

Construction of system for controlling the dimensions of large-scale parts based on a 3D machine vision system

A 3D machine vision system based on a television camera and laser for controlling the large dimensions of large-scale parts is considered. The laser ensures structured illumination of the surface of the object, making it possible to obtain three-dimensional coordinates of representative points of the measurement object using a triangulation method and a parametric model. An approach to calibration of the model by means of a special target is presented.Translated from Izmeritelnaya Tekhnika, No. 12, pp. 24–26, December, 2004.This revised version was published online in April 2005 with a corrected cover date.     

基于图像处理的果蔬自动分等包装生产线的设计与开发

设计开发了一种基于图像处理的果蔬按大小分等及包装的自动化生产线。通过采集和处理果蔬图像,计算出了反映果蔬大小的尺寸参数,实现了形状大体为球形的果蔬在采摘和人工适当处理后,直接进行自动分等和自动包装的功能。该生产线既能提高工作效率,又能更好地保证果蔬的质量。     

Solution strategies for the delamination analysis based on a combination of local‐control arc‐length and line searches

The paper describes a local‐control arc‐length method which can be combined with various forms of line‐search procedure. In particular, a new ‘double‐line‐search’ method is developed, which significantly improves the solution procedure and turns out to be efficient and robust. Although the potential range of applications is wide, the method is here limited to the finite element analysis of delamination in a laminated composite using a cohesive‐zone model combined with interface elements. Three problems have been analysed and comparisons have been made with experimental results. Copyright © 2003 John Wiley & Sons, Ltd.     

Frequency effect and influence of testing technique on the fatigue behaviour of quenched and tempered steel and aluminium alloy

Influences of testing technique and frequency on the fatigue behaviour of 50CrMo4 and EN AW-5083 were investigated. To clarify the effect of test frequency on the fatigue behaviour, tests with 20 kHz and f < 400 Hz were performed. The frequency effect can be caused by temperature, environment and strain rate. For the aluminium alloy, the influence of environment is responsible for the dependence of fatigue lifetime on the frequency. The fatigue lifetime of the steel showed in both environments similar frequency dependency, i.e. the strain rate is assumed to be responsible for the differences in fatigue lifetime.