多次重触发技术的研究

多次重触发技术在存储测试系统中的应用，是针对引信运输安全模拟实验的多次磕碰冲击测试以及齿轮轮齿次多啮合过程弯曲应力而提出的，对每次重触发记录的起始地址进行锁存，以便读数时直接找到该次记录的真实起点，无须利用程序调整。该研究对重触发技术在存储测试系统中的应用具有重要意义。     

基于CPLD的可变频采样存储测试系统的设计

随着EDA技术的发展,CPLD在各种测试系统中得到广泛的应用.本文介绍了一种基于CPLD的可变频采样存储测试系统,该系统具有微体积、低功耗等特点,能对频率多变的信号进行实时记录.文中针对信号的多环境性设计了采样策略,介绍了该系统的组成以及利用CPLD实现变频采样的方法.     

无损数据压缩在存储测试系统中的应用研究

本文探讨了无损数据压缩技术在存储测试系统中的应用.通过对几种常用的无损数据压缩方法比较,验证了LZW算法在存储测试系统中应用的可行性,给出了LZW算法的基本思想及改进方法,并研究了利用VHDL及FPGA实现硬件压缩的可行性,并且实践验证了LZW算法在存储测试系统中具有较好的压缩效果.因此用FPGA实现无损数据压缩可以获得较高的速率,适合在存储测试系统以及微型数据采集系统中应用.     

爆炸场压力测试多存少取技术研究

爆炸场压力信号测试过程中,现场干扰容易引起错误的系统触发导致测试失败。针对分布式存储测试系统,提出一种多存少取的测试技术。大容量的测试数据存储实现长时间的信号记录,可避免误触发引起的失效;标记并提取小容量的有效数据段,可改善数据传输和数据处理效率。设计并研制了一种基于多存少取技术的爆炸场地面压力测试系统,测试节点采样速率1 Msps、128 Gb数据存储、512 k W有效数据段提取,并具有Wi-Fi无线网络覆盖。     

双通道超临界CO_2煤层气井压裂器测试系统设计

针对应用超临界CO_2新技术的煤层气井压裂器发热药量、液态CO_2量和膜片厚度的优化问题,需要有可靠的温度和破膜压力数据作为支撑,由于目前的测压系统只能测量压力,因此设计双通道煤层气井压裂测试系统。该系统采用随压力变化速率进行变速采样的自适应采样技术和通过设定变化速率阈值来触发的随动触发技术,能够更为准确地捕获到完整数据,通过记录地址的方式实现多次采集,为多次实验提供便利。测压系统的压力量程为0~210 MPa,温度量程为0~1 000℃,在膜片厚度2.5 mm、液态CO_2量1.45 kg、发热药量120 g下测得最高温度40℃,最大压力122 MPa,实测证明:该系统为超临界CO_2煤层气井压裂器的优化问题,提供可靠、全面的数据依据。     

射孔枪枪内压力测试系统的研究

枪外环空压力不能直观反映射孔过程,为了更好评估射孔器,研究了一种能够直接测试枪内压力的测试系统.从实际应用需求出发,给出了系统总体设计方案和测试系统的技术指标,重点介绍了采样策略的设定和实现原理.经过模拟油井和模拟膛压实验,结果表明,该存储测试系统能够精确记录射孔过程枪内压力的变化,为进一步研究射孔工艺机理提供理论依据.     

实用弹载存储测试系统

本文所述的存储测试系统,采用了A/D、CPU、大容量存储器、计算机接口等高性能器件,具有高的工作可靠性.能够采集1～4路信号.采用串行口与计算机通讯,数据可直接回放,永久保存.经多次靶场试验测试表明,系统工作可靠,回收率高,可反复多次使用.该测试装置可用于测量弹丸在发射、飞行和撞击目标时的冲击加速度等多种信号.经特殊灌封后,可经受10万g以上的过载,进一步扩大了应用范围,为武器研制提供了一种较好的测量手段.     

基于SSD硬盘的嵌入式高速图像存储技术

高速大容量图像数据的存储技术是数字图像处理中的一项重要技术.为了实现图像数据的高速实时存储,提出了在嵌入式Linux平台上基于SSD硬盘的高速数字图像记录方法.采用Linux驱动程序控制SAS硬盘控制器,将图像数据高速记录在SSD硬盘上.介绍了整个系统结构,给出了Linux驱动程序的实现方法,分析了影响图像数据记录速度的因素.实验测试中图像数据记录速度可以达到150 MB/s,可以满足对高帧频相机的高速图像数据存储的要求.     

基于MSP430单片机的膛压测试系统及状态设计

文章介绍了存储测试的理论,分析了膛压测试系统的工作原理,在此基础上介绍了MSP430单片机在此测试系统中的应用并对整个系统的状态转换进行了详细的分析.与传统的电子测压器相比,本系统具有体积小、低功耗等特点,使其有更大的应用范围.     

基于LoRa技术的无线温度监控系统设计

文章以高温气体绝压压力溯源装置为测试背景,设计了一套高精度、低功耗的无线温度监控系统.该系统采用PT100温度传感器采集温度数据,利用LoRa技术进行数据的无线传输,并利用图形化编程语言Labview设计编写了监控软件,实现了温度的实时监控和记录功能.经过多次的实验,验证了该系统的准确性、低功耗性和便捷性.     

A novel approach to piecewise analytic agricultural machinery path reconstruction

Before analysing machinery operation in fields, it has to be coped with the problem that the GPS signals of GPS receivers located on the machines contain measurement noise, are time-discrete, and the underlying physical system describing the positions, axial and absolute velocities, angular rates and angular orientation of the operating machines during the whole working time are unknown. This research work presents a new three-dimensional mathematical approach using kinematic relations based on control variables as Euler angular velocities and angles and a discrete target control problem, such that the state control function is given by the sum of squared residuals involving the state and control variables to get such a physical system, which yields a noise-free and piecewise analytic representation of the positions, velocities, angular rates and angular orientation. It can be used for a further detailed study and analysis of the problem of why agricultural vehicles operate in practice as they do.     

高精度检测系统在合拢焊缝焊接变形中的应用

介绍了水工大型钢结构的一种高精度检测系统的组成及其工作原理,利用该系统对大型水轮机蜗壳与引水压力钢管合拢焊缝接头焊接过程中座环上变位进行实时监测,同时采用游标卡尺和百分表对焊缝收缩及钢管轴向变位进行监测,测量结果满足设计和工程要求。     

Numerical simulation of an advanced energy storage system using H2O–LiBr as working fluid, Part 1: System design and modeling

The advanced energy storage technology proposed and patented by authors can be applied for cooling, heating, dehumidifying, combined cooling and heating, and so on. It is also called the variable mass energy transformation and storage (VMETS) technology in which the masses in one or two storage tanks change continuously during the energy charging and discharging processes. This paper presents an advanced energy storage system using aqueous lithium bromide (H₂O–LiBr) as working fluid. As one of VMETS systems, this system is a closed system using two storage tanks. It is used to shift electrical load and store energy for cooling, heating or combined cooling and heating. It is environmental friendly because the water is used as refrigerant in the system. Its working principle and process of energy transformation and storage are totally different from those of the traditional thermal energy storage (TES) systems. The electric energy in off-peak time is mostly transformed into the chemical potential of the working fluid and stored in the system firstly. And then the potential is transformed into cold or heat energy by absorption refrigeration or heat pump mode when the consumers need the cold or heat energy. The key to the system is to regulate the chemical potential by controlling the absorbent (LiBr) mass fraction or concentration in the working fluid with respect to time. As a result, by using a solution storage tank and a water storage tank, the energy transformation and storage can be carried out at the desirable time to shift electric load efficiently. Since the concentration of the working solution in the VMETS cycle varies continuously, the working process of the VMETS system is dynamic. As the first part of our study, the working principle and flow of the VMETS system were introduced first, and then the system dynamic models were developed. To investigate the system characteristics and performances under full-storage and partial-storage strategies, the numerical simulation will be performed in the subsequent paper. The simulation results will be very helpful for guiding the actual system and device design.     

几何量数字化测量方法与装备的现状及发展趋势

几何量数字化测量方法与测量装备的发展对制造业影响深远,随着测量任务的多样化与复杂化,对几何量数字化测量方法与测量装备的要求越来越高.本文以现有的典型测量系统为例,根据传感单元工作原理的不同对这些测量系统进行了分类,分别介绍了激光跟踪仪、激光雷达、激光跟踪干涉仪、移动空间坐标测量系统、室内GPS、数字摄影测量系统的数学模...     

Application of pressure transducers subjected to large vibrations

Conclusions The application of the above system for protecting the means of measurement from appreciably destabilizing effects ensures that the required statistical measurement precision is obtained, trustworthy information about the dynamic processes (in measuring relatively high pressures) which occur over periods exceeding 0.03 sec is provided, and a higher reliability for the normal functioning of a measurement channel is ensured with its possible future utilization for controlling the working objects with a speed of operation exceeding that of existing control systems.In principle the above system for protecting pressure transducers from destabilizing effects can be extended to the measurement of lower pressures and processes with characteristic durations down to 0.01 sec. This entails reducing the pipeline length and preserving at the same time the vibration properties of the system.Translated from Izmeritel'naya Tekhnika, No. 10, pp. 23–25, October, 1969.     

一种高准确度呼吸节律发生器

介绍了一种用于检测多参数监护仪呼吸节律的模拟装置,可解决多参数监护仪的呼末二氧化碳浓度示值误差和呼吸频率示值误差两个计量参数检定的问题,该装置采用低压设计,标准气体消耗量低,模拟潮气量、呼气量、吸气量、呼气时间、吸气时间可根据监护仪不同病人工作模式进行调整,可用于多参数监护仪的检测、质保维修、校正等工作。     

A learning algorithm for self-calibration of a voltage calibrator

An algorithm either to extend the calibration period or to reduce the measurement uncertainty of a DC voltage reference module is presented. This module is used either as a transfer, independent, or working standard, or as a reference module incorporated into a larger measuring system. The basic idea is that the deviation history of measured voltage differences of reference elements of a group reference module during the calibration period can be used as a learning period for a neural network. This neural network, when created, can numerically correct particular reference elements later in the working period. Results were obtained by simulation and evaluated on the basis of empirical data and simulated input functions. Hardware solutions to model this algorithm are discussed     

一种高精度低漂移电子积分器的设计

讨论了由运算放大器构成的理想电子积分器的工作原理,分析了积分漂移、积分时间常数等主要因素对积分输出误差的影响及改善措施。设计了一种测量灵敏度高达10-9 C新型电子积分器,并将该电子积分器应用于10-7C～10-8C电量微磁通信号测量系统,通过实际测量数据证明,该积分器可实现对瞬变小信号进行高精度的测量。测量精度达到满量程小于1.5%,分辨率为0.5%,而且该设计方案结构简单、灵敏度和精度高、经济性好,有很好的推广使用价值。     

Simultaneous measurements of dynamic values using the transit timemethod

The problem of simultaneous and accurate measurements of two dynamic values, time dependencies of flow velocity and ultrasound velocity in the flow, is analyzed. In order to measure two dynamic values simultaneously a theory of the transit time method has developed, and the theoretical model of a microprocessor-based measuring system has been derived. The ways to improve the accuracy and information of such dual-channel measurement systems have been examined. It is shown that invariance between two channels of a measurement system can be achieved when dynamic, nonlinear, parametric models of these channels are identified in real time during the process of measurement, and when the multipulse irradiation of flow is used. The results of computer simulation of transit time method dynamic errors are represented. A method of minimizing these errors has been proposed     

测力刀柄系统标定技术研究

测力刀柄系统可实时监测切削过程的轴向力和扭矩的变化,为测试自主设计的测力刀柄系统的使用性能,设计并研制了一套标定辅助工装,搭建了标定实验平台,完成了静、动态标定实验.采用逐级加、卸载法,确定了测力刀柄系统的线性度、重复性和滞后性等静态特性指标;通过脉冲激励法获得了测力刀柄系统的固有频率、阻尼比和最大工作频率等动态特性指...