灼热桥式电火工品瞬态脉冲试验的现状和趋势

主要介绍了近年来电火工品瞬态脉冲试验在国内外的发展现状,包括试验仪器、热参数计算和分析的进展;同时介绍了瞬态脉冲试验在电火工品质量检测中的作用;并讨论了现在瞬态脉冲试验的应用范围和局限性;结合现有的仪器和软件,展望了瞬态脉冲试验今后在硬件和软件方面的发展趋势。     

浅谈桥丝式电火工品瞬态脉冲试验的研究现状

文章主要介绍了近年来电火工品瞬态脉冲试验在国内外的发展现状.包括试验仪器、热参数计算和分析的进展,以及瞬态脉冲试验在电火工品质量检测中的作用.收集并分析了瞬态脉冲试验的应用范围和局限性,结合现有的仪器和软件,展望了瞬态脉冲试验今后在硬件和软件方面的发展趋势.     

电火工品瞬态脉冲试验无损性研究

通过电点火头的对比试验研究了瞬态脉冲试验对电火工品发火性能的影响,试验结果表明,由于瞬态脉冲试验电流较小,对电火工品的性能没有显著影响,且是无损的.     

桥丝式电点火头发火时间的预测

通过瞬态脉冲无损检测试验得到桥丝式电点火头的电热响应参数,利用电热响应参数分别采用数学模型和人工神经网络模型预测电点火头的发火时间,并与实测发火时间进行比较.结果表明,人工神经网络方法与电火工品瞬态脉冲无损检测技术相结合,用来预测电点火头的发火时间,是电火工品瞬态脉冲无损检测领域的一条新的途径.     

基于神经网络的电火工品瞬态脉冲实验分析技术

本文介绍了神经网络在电火工品瞬态脉冲实验分析中的应用，具体说明了训练样本的选取和识别验证的结果。     

神经网络用于电热响应曲线的分析

瞬态脉冲试验是一种对桥丝式电火工品进行无损检测的方法.通过瞬态脉冲试验得到火工品的电热响应曲线,正常的电热响应曲线是光滑的,而非正常的电热响应曲线往往有较大的波动,出现非正常电热响应曲线的火工品一般都存在某种疵病.该文将神经网络技术用于对电热响应曲线的分析,以区分正常的电热响应曲线和非正常的电热响应曲线.研究结果表明,该方法可以比较准确地区分这两种电热响应曲线,实现自动判断.     

一个可实现中间触发的采集装置

在电子、电机、机械工程、材料试验以及生、物、化等领域往往需要对单项非周期瞬态过程进行测试。目前常用的测试仪是瞬态波形记录仪。由于瞬态信号的特点是随机的,又是单次非周期性的,而瞬态记录仪的存贮器容量有限,因此有效地捕捉瞬态波形是这类仪器的关键问题。本文根据近年来科研实践。谈谈有关瞬态信号捕捉中触发技术的硬件和软件问题。     

电火工品真实静电感度测试系统便携式设计

静电感度是评价电火工品抗静电能力的一项重要指标,真实静电感度以电火工品上实际消耗的静电能量进行统计计算,其值能够反映每种试品对静电放电的真实敏感程度。采用了静电高压发生器、高压脉冲电容、高压真空开关、USB双通道数据采集卡及高压无感电阻等,对JGY-89真实静电感度测试系统进行了便携式设计,通过测试,对仪器系统进行了考核验证。     

圆锥薄壳体瞬态动力响应分析

运用有限元分析软件ANSYS／LS-DYNA对在余弦脉冲载荷作用下某圆锥薄壳体的瞬态动力响应过程进行分析，得出了不同时刻下壳体等效应力场的分布，考察了该壳体结构的动强度性能。同时通过对一些典型节点位移、速度和应力响应曲线的分析，归纳总结出了在余弦脉冲加载条件下圆锥薄壳体瞬态响应的规律，对该壳体的结构设计和改型提出了合理化建议，并定性地分析了该脉冲加载对壳体内部电子设备的影响。最后，将理论计算和试验结果进行对比分析，验证了计算模型的正确性。     

地回线对容性耦合钳快速瞬态脉冲注入的影响

介绍了容性耦合快速瞬态脉冲抗扰度试验方法,分析了线束间的不同耦合路径,并通过实验法验证了地回线对试验结果的影响。最后,为试验的实施提出了理论指导。     

工业雷管抗弯性能试验装置与方法设计

为了研究工业雷管的抗弯性能,设计了一种测试工业雷管抗弯性能的试验装置及试验方法,研究了国内部分生产企业的工业雷管的抗弯性能。结果表明:设计的试验装置安全、可靠、操作简单,能够满足工业雷管抗弯性能测试要求;我国工业雷管的抗弯性能整体质量能够满足欧盟有关技术标准和规范的要求,抗弯性能质量达到了国外发达国家同类产品的水平。     

火工品高频段射频阻抗测试技术?

为测量高频段火工品射频阻抗,根据火工品脚线和矢量网络分析仪的结构特点,设计了火工品专用连接夹具,实现了同轴和平行线的有效连接。并对夹具引入的测量误差进行了修正计算,建立了基于矢量网络分析仪的高频段火工品射频阻抗测试系统。利用此系统,测量了火工品1~18 GHz范围内的射频阻抗,共出现了5个谐振点,在谐振点火工品从电磁环境中吸收的能量最大,为评价火工品在电磁环境中的安全性提供了数据支撑。     

电磁环境下桥丝式电火工品安全性仿真研究

采用等效天线负载法计算了电磁环境下桥丝式电火工品中的辐射感应电流,结合具体算例模拟了核爆电磁脉冲和微波武器作用下桥丝中感应电流的热效应。研究结果表明,核爆电磁脉冲不易造成桥丝火工品的意外发火,但高功率微波武器的连续作用,会导致桥丝式电火工品在极短的时间内发火。     

数码雷管起爆系统在三峡三期碾压混凝土围堰拆除爆破中的应用

数码雷管起爆系统由可编程的数码雷管和控制设备(编码器和起爆器)组成。编码器用于联网期间的延期序列设定和功能测试,能够读取和储存唯一的雷管识别码和必需的延期时间;起爆器用于最终的系统测试和点火。本文介绍了i-konTM数码雷管起爆系统在三峡三期碾压混凝土围堰拆除爆破中的应用情况。实践证明,数码雷管与常规雷管相比,具有许多无可比拟的优点,在某些复杂环境下的工程爆破应大力推广使用。     

Application of Nonparametric Binary Regression to Evaluate the Sensitivity of Explosives

The performance of slapper detonators depends on the sensitivity of the explosive material within the detonators to a voltage stimulus. A series of experiments is typically used to estimate the sensitivity of the explosive material by subjecting individual detonators to various stimulus levels. The traditional methods for selecting stimulus levels and analyzing the resulting binary data are based on a parametric probit model that relates the probability of detonation to the level of the voltage stimulus. In this article, we explore an alternative method for analyzing the binary data using nonparametric regression. The use of this alternative method is illustrated by analyzing the ungrouped binary data resulting from a series of 25 tests that were used to characterize a single lot of detonators. We conclude that nonparametric regression can be very useful in visualizing the underlying relationship between a binary response and a covariate, even when the sample size is relatively small.     

Applications of non-destructive testing techniques for post-process control of additively manufactured parts

This paper presents an overview on the principle of operation for post-process inspection non-destructive testing (NDT) techniques. The techniques include visual inspection, liquid penetrant testing, magnetic particle testing, eddy current testing, ultrasonic testing, and radiography. The applications of these NDT techniques in additive manufacturing (AM) and their suitability for defects detection of additively manufactured parts are reviewed. The sensitivity, and the advantages and disadvantages of each technique are evaluated. The types of defect, and the detectability of these defects by NDT techniques are assessed. The applicability of each NDT technique for different categories of AM process is discussed. The categories of AM are, namely, material extrusion, powder bed fusion, vat photopolymerisation, material jetting, binder jetting, sheet lamination, and directed energy deposition.     

Additive manufacturing process monitoring and control by non-destructive testing techniques: challenges and in-process monitoring

This paper examines on the obstacles specific to the implementation of non-destructive testing (NDT) techniques in additive manufacturing (AM). The general challenges impeding the adoption of AM for volume production of parts, and the use of NDT techniques to ameliorate some of these challenges are studied. These challenges include the lack of understanding of AM materials, and insufficient standards for the mechanical testing and NDT of additively manufactured parts. An overview on the principle of operation for in-process inspection NDT methods is presented. The techniques include thermography, and acoustic emission testing. The applications of these NDT techniques in AM and their suitability for defects detection of additively manufactured parts are reviewed. The sensitivity, and the advantages and disadvantages of each technique are evaluated. The types of defects, and the detectability of these defects by NDT techniques are assessed.