COMPUTER AIDED INSPECTION PLANNING

ＣＯＭＰＵＴＥＲＡＩＤＥＤＩＮＳＰＥＣＴＩＯＮＰＬＡＮＮＩＮＧＴａｎｇＸｉａｏｑｉｎｇＣＯＭＰＵＴＥＲＡＩＤＥＤＩＮＳＰＥＣＴＩＯＮＰＬＡＮＮＩＮＧ￥ＴａｎｇＸｉａｏｑｉｎｇＡｂｓｔｒａｃｔＣｏｍｐｕｔｅｒａｉｄｅｄｉｎｓｐｅｃｔｉｏｎｐｌａｎｎｉｎ...     

基于Linux的坐标测量机测头与计算机系统接口方法

提出了一种基于Linux的坐标测量机测头系统与计算机系统的接口方法,包括坐标数据和测头触发信号的硬件接口和软件接口。从而实现了坐标测量机测头数据的自动采集和处理。辨向四细分电路使测头的分辨率提高到了1μm。     

非特征点双目测距技术研究

提出了一种局部稠密匹配与人工干预相结合的测距方案,利用非特征点与特征点的位置关系,构建“最小矩形”以缩小匹配范围,再应用NCC（归一化互相关）算法对非特征点进行稠密立体匹配,最后根据双目测距原理直接获取非特征点的距离信息。该方法能任意选取图像上的非特征点进行实时距离测量,具有精度高、速度快和操作性强等优点。     

任意倾角表格框线的快速检测

表格的识别近年来受到了越来越多的关注,已取得一些行之有效的成果。其中的部分算法可抗任意角度的倾斜,然而其运行效率却都低于投影类方法。而投影方法虽然效率很高,但不能处理严重倾斜的表格。文章给出一种新的检测倾斜表格框线的途径。算法利用数字影像中直线段的结构特征高效地检测出表格的一条边框线,并由此获得所需的角度值,进而沿着角度所指定的方向迅速搜索出边框线。整个检测方法的效率类似于投影法,同时可抗任意角度的旋转。     

Computer-aided measurement plan for an impeller on a coordinate measurement machine with a rotating and tilting probe

This paper presents a computer-aided measurement plan (CAMP) for an impeller on a coordinate measurement machine (CMM) with a rotating/tilting probe. The blade surfaces of a machined impeller were measured exactly to secure the machining tolerance and surface finish of the impeller. CMM with a rotating and tilting probe is commonly used for this measurement. However, it is not easy to evaluate all the points on the impeller surfaces due to the time-consuming nature of the CMM measurement. In addition, many points cannot be easily accessed by the CMM probe due to the interference between the probe and the impeller blades. Furthermore, the inherent complexity of the existing teaching operation of a probe using a joystick suggests the necessity of developing a new method for the measurement planning of an impeller. Thus, this paper proposes a CAMP for effectively gauging the inspection points based on the ruled line information of the impeller blade surfaces. The proposed plan partitions the surfaces into several measurement regions based on the ruled lines of a blade surface and the approach vectors of the probe. Finally, a case example for an impeller is presented to demonstrate the effectiveness of the proposed strategy.     

Hand tool handle size and shape determination based on hand measurements using a contour gauge

The purpose of this study is to provide a novel approach to tool handle design and development based on measurements of hand shape using a contour gauge. In general, traditional design techniques, designing based on anthropometric data, and derived mathematical models do not incorporate enough subject data to design a customized product. First, anthropometric measurements on the right hand of 60 participants were collected with a contour gauge to manufacture matching handles. A curved handle fitting the human hand was constructed with common computer‐aided design software, and cylindrical handles and elliptical handles were added for comparison. All of the handles were used to record the participants' grip force to evaluate the operating efficiency of the handles. Finally, the participants completed a comfort‐rating questionnaire. The results show that contours based on the hand provided the highest operating performance and the best overall comfort‐rating compared to cylindrical handles and elliptical cylindrical handles. The newly developed handles in the grip force tasks have the highest push performance and the best comfort ratings compared to traditional cylindrical and elliptical handles. The developed handles could provide the hand tool industry information on developing and manufacturing many other similar handle designs (such as those for saws and electric screwdrivers).     

一种铂电阻高准确度测温方法

介绍了一种应用铂电阻进行高准确度测温的方法。24位的Σ-Δ型A/D转换器AD7714的应用保证了0.001℃的测量分辨力,温度的采集采用了极其简洁的铂电阻平衡桥电路,测量软件中的对分搜索查表法使铂电阻测温不再存在T/R转换的非线性误差,用软件方法进行了测量值的零点和满幅的调准,使测量误差在全量程小于0.02℃。     

同步双界点测频测周集成高准确度频率测量

针对现有测频技术存在问题 ,提出一种新的测频方法 ,它是在测频测周的基础上 ,利用软件同步技术、测频测周双分界点及改变闸门时间的方法进行频率测量 ,从而大大提高准确度 ,扩大测量范围