基于USB的内燃机曲轴角振动信号采集仪研制

针对传统内燃机故障诊断系统采用ISA、PCI插卡等固定方式对曲轴角振动信号进行采集,操作复杂,携带不方便等缺点,提出一种便携移动式角振动信号采集方式。根据内燃机角振动诊断理论最新成果,对曲轴角振动信号的测量原理、方法进行了研究,利用51单片机技术,基于USB开发了便携式曲轴角振动信号采集仪器,并对其原理、硬件结构、软件流程进行了介绍。仪器性能稳定、精度高、操作简便,经厂家使用效果良好。     

基于AVR单片机的内燃机曲轴角振动诊断仪研制

根据发动机角振动诊断理论最新成果,利用AVR单片机技术,开发了以曲轴角振动理论为基础的便携式仪器,并对其原理、硬件结构、软件流程进行了介绍。仪器性能稳定、操作简单,可脱离计算机而独立运作,具有一定实用性。     

动态激光小角度测量仪

一、前言我们研制的仪器动态测角的对象是角振动台。角振动台以不同的频率和振幅做角振动.通常用加速度计和园感应同步器测量角振幅.如果要做高精度的角振动台,就需要高精度的测量仪器,目前国内的测量仪器不能满足要求,有的仪器分辨力符合要求,但是频率响应满足不了要求,动态激光测仪就是根据这种需要研制的,该仪器不仅能实时测量角振动台的角振幅,它与计算机相连,还能对角振动台的振幅进行实时反馈控制。对     

玻(王力)度盘刻线位置误差测定方法和数据处理

玻璃度盘是光学测角仪器中的标准器之一,是光学测角仪器决定精度的主要部件,因此对玻璃度盘的刻划精度必须有一个正确的检定。由于仪器的使用场合不同对刻划误差的衡量标准也不同,过去高精度的测角仪器都采用双面读数的办法来提高精度,因此刻划误差的衡量标准都采用直径误差的概念,而不用度盘刻划的位置误差,但随着仪器制造     

eSeis节点仪器与G3i有线仪器的联合应用研究

伴随电子信息技术的发展,地震勘探仪器也开始进入到一个全新发展阶段。在新时期,为了能够满足不同地质环境下勘探工作的发展需要,在同一个地震勘探项目工作中要注重综合使用多个类型的地震采集仪。本文以eSeis节点仪器与G3i有线仪器为基本研究切入点,结合具体工程项目,分析eSeis节点仪器与G3i有线仪器在地震勘探工程项目中的应用。     

航空透明件光学角偏差测试仪的光学系统设计

光学角偏差为航空透明件的一个最重要光学性能指标.介绍了一种航空透明件光学角偏差测试仪,其光学系统采用LED光源、双光路、千兆网面阵相机等技术,实现了光学角偏差自动检测,并增加了分辨率检测功能.光斑位置检测为角偏差测试中的关键技术,其判断精度直接决定了仪器的精度.在模板匹配算法的基础上提出了一种新的检测光斑位置的亚像素算法,提高了仪器的测量精度.仪器的角偏差测量范围为±42.6′,测量的绝对误差≤±7″.     

时栅测角系统误差自动采样及补偿研究

由于时栅测角系统受限于校准器的运动和装配环境,难以使用光栅作为精度基准仪器来进行密集的误差采样.为了实现较高精度的测量,通过对时栅测角系统的位移解算和对磁场式Ⅱ型时栅传感器结构进行了剖析,利用稀疏采样误差数据开展了频谱研究,得到了测角系统的补偿模型;提出了一种基于激光干涉仪的时栅测角系统误差自动稀疏采样及补偿的方法,采...     

Thermo 17i氨及总氮监测仪校准维护与比对

近年来针对大气中NH3的监测研究越来越多,出现了很多相关监测设备,其中Thermo公司的17i仪器可以实时获取数据,与现有空气子站也可以较好的兼容,但是其校准方面还很不成熟,本文对17i校准方法进行了探索,发现缩短气路可以加快校准速度,确定了相关校准维护方法和钢瓶气更换频率,最后还与其他自动监测设备进行了相关比对,相关性较好。     

嵌入式高精度锥度（角）测量仪的研制

根据锥度（角）的定义及测量工艺,研制了优化的高精度数字式锥度（角）传感器。测量仪主要由89C51CPU、存储器、通信接口等组成;利用双计数器实现光栅信号的可逆计数;采用查表插值测量算法计算锥角α;介绍了仪器软件设计流程框图。针对某重载卡车变速器一轴锥孔锥角参数高精度要求,给出了该仪器的测量准确度和使用验证等结果。     

锥蜗杆传动(二)——瞬时接触线及其与相对速度之间的夹角

<正> 本文先介绍计算公式,然后结合我室所加工的一台锥蜗杆试验装置进行分析。一、锥蜗杆的齿面 1.齿形参数锥蜗杆一般以阿基米德螺旋面作为齿面,其轴向剖面内的齿廓为直线,如图6所示。由图中可以看出,轮齿两侧面的齿形角是不对称的,向着小端一侧的齿廓面称为“i”面,其齿形角α_(0i)(指齿廓直线和节锥母线的垂线之间的夹角,也即轴向压力角)较小,一般取α_(0i)=15°;向着大端一侧的齿廓面叫做     

表面轮廓测量仪角度测量误差校准用夹具设计

针对触针式表面轮廓测量仪角度测量误差校准过程中存在的角度量块定位问题,设计了一种角度测量误差校准用夹具。在校准表面轮廓测量仪角度测量误差过程中,该夹具提供了一种角度量块相对于仪器的快速、精确定位手段,保证了校准精度,提高了校准效率。     

凸轮轮廓度与对称度的计算机辅助测量

通过对单测头与双测头的原理进行比较分析,确定了在实际应用中使用单测头进行测量的方案。开发出单测头的对称凸轮计算机辅助测量仪(CAT),并设计了相应的控制软件。对一次测量得到的多个数据进行处理,得到检测出的轮廓曲线、起始角、凸轮的轮廓度与对称度,并进行相应的评定。     

曲轴机加工尺寸分析与工艺控制

分析了曲轴机加工工艺中连杆颈的平行度和角度产生的原因,提出了在线间接测量连杆角度的方法,直接测量连杆颈平行度的方法,淬火对曲轴轴向尺寸的变化及影响方面进行了工艺分析。     

小角度检查仪的设计制作

设计制作小角度检查仪用于高精度角度测量仪器(自准仪、平直度检查仪、水平仪等)的检测。     

杆式风洞应变天平动态实验、建模与补偿

杆式应变天平是一种6维力传感器,在风洞实验中测量飞行器模型所受的各个方向的力和力矩.但是,其动态响应的超调量大,调节时间长,即动态性能差,无法满足动态测试的要求.为此,设计了应变天平动态标定装置,进行动态标定实验;基于实验数据建立应变天平的动态数学模型,给出性能指标;研制基于DSP的动态校正系统,实现对应变天平6路输出信号的动态补偿,以加快应变天平的动态响应.所建的模型和所研制的系统得到实验结果的验证.     

On the effects of lateral gauge misalignment in shocked targets

Plate-impact experiments have been used to interrogate the influence of gauge alignment on the shock response of wire-element lateral manganin stress gauges in PMMA and aluminium targets. Embedded gauges were progressively rotated relative to the target impact face. Peak stress and lateral gauge rise-times were found be proportional (negatively and positively, respectively) to the resolved angle of the embedded gauge element. However, lateral stress gradients behind the shock were found to be relatively insensitive to gauge alignment. In addition, investigation of the effects of release arrival showed no connection to either peak stress or behaviour behind the shock.     

The statistical gauge in geometrical verification. Part II. The virtual gauge and verification process

Currently, most measurement and geometrical verification processes are based on the characterization of distances or angles between geometrical elements. Methods have already been developed for the verification of ISO specifications using the statistical information included in a set of points. These methods are however based on the development of measurement sequences and hence a set of geometrical constructions. The main problem in this verification process is the propagation of uncertainties. With a correct expression of a virtual gauge, it is possible to avoid this propagation; indeed by using a virtual gauge manipulation, initial best-fitted surfaces are never altered. The aim of this paper is to present a new approach using this statistical information to describe the measured part and develop a virtual gauge system for verification. This has been done in two parts. The first one focused on the statistical modeling of the measured surface; this second part will now describe a verification method based on a virtual, i.e. numerical, gauge.     

The statistical gauge in geometrical verification: Part I. Field of probability of the presence of matter

Currently, most measurement and geometrical verification processes are based on the characterization of distances or angles between geometrical elements. In a previous paper, a method was developed for the verification of ISO specifications using the statistical information included in a set of points. This method is based on the development of measurement sequences and hence a sequence of geometrical constructions. The main problem in this verification process is to propagate uncertainties. With a correct expression of a virtual gauge, it is possible to avoid this propagation; indeed by using virtual gauge manipulation, initial best-fitted surfaces are never touched. The aim of this paper is to present a new approach using this statistical information to describe the measured part and develop a virtual gauge system for verification. This will be done in two parts. The first part will focus on the statistical modelling of the measured surface; the second part will describe a verification method based on a virtual, i.e. numerical, gauge.     

Repeatability/Linearity Study and Measurement Loss Cost Analysis of an Automatic Gauge

Computer-aided inspection (CAI) has become one of the fundamental steps in advanced manufacturing by employing automatic gauges. However, it is necessary to provide a more practical way to evaluate CAI on-line efficiency. Since a gauge capability study should be conducted before applying any automatic gauge, the necessary off-line gauge assesment for CAI is introduced in this paper. An R&R (repeatability/reproducibility) study is commonly conducted in the gauge capability study, but in this paper, an R&L (repeatability/linearity) study of a machine vision system is investigated and introduced. The ANOVA approach and regression approach are applied and compared to study the linearity effect. The measurement loss cost includes extra costs (i.e. costs of discarding, reworking, inspection, and quality loss) that arise from measurement error. These costs are analysed by interpreting the relationships between manufacturing capability, gauge capability, and the tolerance. As most gauge capability studies were conducted for the bilateral tolerance inspection, unbalanced tolerance inspection is considered here. The way that the relative costs contribute to the measurement loss cost is also studied. Rather than using a constant measurement error determined by previous observations, the measurement error model is embedded in the relative cost models. Users can then evaluate CAI on-line efficiency by incorporating the measurement error when the tolerances are rapidly changed to satisfy customer requirements.     

万能激光测长机测量非标长量块的不确定度分析

万能激光测长机是一种可以进行绝对测量和相对测量的长度计量仪器，用途非常广泛.量块检定一般采用比较法测量，对于非标准长量块的测量现在可以利用万能激光测长机进行测量。介绍了用万能激光测长机测量非标准长量块的方法，并对其不确定度进行了详细分析。