球径和球度误差气动测量新方法

介绍了自主研制的微型气针传感器和测量装置;基于气动测量原理,采用误差分离和修正技术,对高精度球面的球形构件的球径和球度误差进行了在线、动态测量。     

差压式气动传感器稳定性研究

深入研究差压式气动传感器的原理和特性,设计一套实验装置。通过实验分析确定出影响差压式气动传感器稳定性的主要因素,如气源压力波动、空气质量不稳定性、电气误差和非线性误差等;并采取适宜的措施,减少不稳定因素的影响量。研制出一种新型差压式气动传感器;利用误差修正技术对其系统误差予以修正,不仅提高了传感器的灵敏度,拓宽了测量范围,而且有效提高了气动传感器测量准确度。     

浮标式气动测量仪“最大测量间隙”检定方法探讨

<正>一、问题的提出最近经常有用户反馈,我公司生产的QFB-A气动量仪在按JJG356-2004《气动测量仪》检定规程进行检定时,"最大测量间隙"一项存在问题。二、最大测量间隙的定义气动量仪的最大测量间隙是指,当测量头为2mm喷嘴孔径的平行喷嘴挡板机构时,能保持仪器的公称倍率     

传声器阵列反方法及其对飞机噪声源识别

为了完善飞机气动噪声源识别测量技术,并认识当代大型客机气动噪声源的基本特征,改进噪声源识别的大型平面传声器阵列。该阵列由104个传声器组成,104个传声器在平面中的位置通过计算机优化设计的方法确定。并用数值模拟的方法检验平面传声器阵列的频谱特性。应用此阵列在西安咸阳国际机场对近20个架次的进场着陆飞机噪声源进行试验测量。通过实验验证传声器阵列技术和传声器阵列数据处理软件。     

曲轴径多截面气动测量检具设计

以曲轴零件的外径测量为例,介绍了气动测量的基本原理,通过气电转换器将压力的测量转换为电子柱的读数,介绍了检具的工作过程,实现了零件无接触式气动测量和测量自动化,提高了检测效率.     

强风下方截面高层建筑横风向气动阻尼比研究

该文设计了一种质量和结构阻尼比可调的底部弹性支撑刚性体的双向摆式气弹模型,并通过气弹模型风洞试验获得模型顶部加速度响应时程。运用改进的随机减量技术,识别了湍流场中强风下方截面高层建筑横风向气动阻尼比。分析了风场类别、结构阻尼比、均匀当量质量以及模型高宽比对横风向气动阻尼比随折算风速变化规律的影响。最后提出了横风向气动阻尼比的经验公式,并将引入气动阻尼比后的横风向响应计算值与气弹模型风洞试验测量值比较,证明了该气动阻尼比经验公式的正确性和实用性。     

电动、气动扭矩扳子示值的测量不确定度评定

正一、测量过程1.在电动、气动扭矩扳子使用说明规定的环境条件下,使用示值相对允差δ_(b_rel)的扭矩仪测量电动、气动扭矩扳子在设定扭矩值T_j下扭紧高扭矩率模拟器时输出的扭矩量值,该过程重复进行n次,以n次测量值T_(Hji)(i=1,2,……,n)的算术平均值作为电动、气动扭     

气动测量仪示值误差测得值的不确定度分析

气动量仪分为浮标式气动测量仪和电子柱式气动测量仪,应用也越来越广泛。由于其操作简单、使用方便、测量精度和稳定性高,被大量应用于现场和实验室的形状、长度、位置误差测量。本文依据JJG 356-2021《气动测量仪检定规程》,对可能影响测得值的各环节进行了细致分析,并以分度值1μm的浮标式气动测量仪和分辨力0.5μm的电子柱式气动测量仪的测得值为例,分别进行了不确定度分析与评定。     

喷油嘴偶件配合精度的自动测量方法

本文介绍了利用压力位移气动传感方法和扩散硅压力传感器组成的发动机喷油嘴测量系统，能实现喷油嘴偶件的自动测量，克服了目前使用的浮标式气动量仪测量速度慢及显示结果不是明显等缺点。     

航空发动机室内试车台推力测量及其溯源体系分析

航空发动机推力测量相关影响参数的准确获取是保障台架推力测试准确性的前提。本文通过梳理室内试车台架推力附加阻力气动修正方法中所用到的关键试验参数、航空发动机试验与推力测量相关的常见控制参数、测量工具以及溯源标准及要求,最终形成相对完整的溯源体系,为实际试车工况下发动机推力测量校准技术的研究提供了借鉴。     

Measurement Automation to Implement Evaluation Procedure of Four-Terminal-Pair Capacitance Standards Using S-Parameters

The evaluation procedure of four-terminal-pair capacitance standards using S-parameters is very complex as it involves the measurement of different parameters by multiple instruments. It also involves complex computation of effective capacitance as a function of frequency and its associated uncertainty in measurement. The reported paper presents the development of measurement automation program to implement evaluation procedure of four-terminal-pair capacitance standards of values varying between 1 and 1000 pF up to 30 MHz. The measurement automation increases the functionality with a comprehensive and flexible tool set for data acquisition, analysis, reporting and representation of results. The sequence of operations performed by the developed measurement automation program is described in detail. The program configures and measures S-parameters, converts S-parameters into corresponding impedance and admittance parameters, determines series and parallel resonance frequencies. Thereafter, it determines residual capacitive and residual inductive parameters and finally computes the effective value of each capacitance standard as a function of frequency along with the associated uncertainty in measurement. Measurement automation has provided precise and efficient way for the implementation of evaluation procedure of capacitance standards.     

Determination and Validation of Average Value of National Standard of DC Voltage Using Different Methods at CSIR-NPLI

The aim of this paper is to evaluate and validate the average value of national or secondary standard of DC voltage, using four different methods; comparison, substitution, difference and ratio method. In the paper the custom made automation program developed to control the whole measurement process is discussed as well. The automation system has been developed in the view of achieving maximal quality of metrological performance i.e. minimum measurement uncertainty and maximum reliability. It is found that measurement automation provides reliable and efficient way for the calibration of Zener based standard of DC voltage.     

Automation of a precision temperature calibration laboratory

The objective of the paper is to discuss the automation of a precision calibration laboratory in the view of achieving maximal quality of metrological performance. Besides automation of measurement equipment for ease of operation, communication and data processing, basic emphasis is given to reliability of operation, flexibility, and possibility of achieving minimal uncertainty for given measurement equipment. Several software design guidelines are discussed in the case of automation of a high-precision temperature calibration laboratory     

基于ARM平台的声呐换能器绝缘自动测试仪

针对声呐换能器绝缘检查中存在的自动化程度低、检查效率低和检查有一定危险性的问题,研制了一款声呐换能器绝缘自动测试仪.该测试仪采用ARM作为主控,用电压比较法和全桥法进行组合测试,通过高压电路产生测量所需的高压,利用选通控制和串口实现测量通路的自动化和远程控制,实现了测量自动化,提高了装备维修保障效率.     

The Progress of Automation of Photographic Dosimetry,April 1964

The increasing scale and complexity of routine personnel monitoring work has introduced the need for automation. This paper reviews the current progress in the automation of the measurement of density of monitoring films and of the counting of recoil protons in nuclear emulsions used for fast neutron monitoring. Other aspects of automation in this field are covered briefly.     

车轮半自动径,轴向跳动谐波检测仪的研制

本文介绍“车轮半自动径、轴向跳动谐波检测仪”的用途，测量原理及主要技术参数，应用计算机完成了测试数据在线处理及测试过程的自动化。     

钢管测长精度控制的研究与实现

文章介绍了钢管测长原理,对影响测长精度的等进行了较全面的分析,并进一步探讨了控制测长精度的措施.实践证明,控制影响钢管测长精度的因素能有效地提高钢管长度测量的自动化和标准化.     

Determination of the statistical characteristics of the chaotic motion of particles in a fluidized bed

A method of automation of the measurement of the effective diffusion coefficient in a fluidized bed is proposed and developed.     

Symbiose von Meß- und Automatisierungstechnik – ein neuer Weg zur Qualitätssicherung bei Versuchsanlagen

Symbiosis of measurement and automation technique – a new way for quality assurance at test facilities Automation and measurement technique of a complex test facility are mostly realized in distributed and decentralized systems, in which problems occur e.g. at interfaces, in synchronization, or because of different operator surfaces. This paper shows a new way to achieve an increased standard of quality by the symbiosis of a data acquisition system (DAS) and a digital control system (DCS). This improved quality not only concerns the test facility itself (including design, projection and build-up), but also the subsequent tests to be carried out using the facility. Such a combined measurement and automation system has been built up for a thermo-mechanical, thermo-atmospherical test facility for qualification of high temperature components. The findings from this work, the efficiency of the system and future applications are outlined.     

Computer control of a slow-AC technique for thermopowermeasurements

A measurement algorithm and the required instrumentation for computer automation of temperature-dependent thermopower measurements over the range of 4.2 to 350 K are described. The performance of the measurement system is demonstrated by examining typical results obtained on bulk and thin film samples of the thallium-based ceramic superconductor. The quality of the measurement data obtained is improved by increasing the density of the collected data and by improving reproducibility of the results