TPS中调节控制点的综合应用

提出了在控制系统更新时,利用新系统的控制功能,实现对老系统中一些特殊控制回路的控制方法.详细介绍了利用Hon-eywell公司HPM中常规控制点的功能,对现场多变量参数求和运算以后进行大可调比参数的控制,以及这种控制回路的控制策略和组态方法.应用结果表明,该控制回路控制精度高、可靠性高.据此提出了充分利用系统软件提供的各种功能模块,解决生产实际问题的方法.     

高功率微波对无线电引信的作用机理研究

介绍了无线电引信电磁干扰的分类方法,以无线电引信微波辐照效应为基础,从能量耦合途径、误炸和软、硬损伤等方面,深入分析了高功率微波对无线电引信的作用机理.     

无线电引信的高功率微波辐照效应研究

分析了无线电引信电磁环境效应研究的重要性,给出了研究所需的实验设备和实验方法,选择某型集成电路分米波无线电近炸引信,从勤务处理状态和工作状态两个方面,研究了无线电引信及其电点火头的微波辐照效应,确定了被试无线电引信的高功率微波辐照损伤阈值,分析了高功率微波对无线电引信的能量耦合途径与损伤机理.     

Analysis of material degradation and life assessment of 25Cr–38Ni–Mo–Ti wrought alloy steel (HPM) for cracking tubes in an ethylene plant

Radiant tubes made of wrought 25Cr–38Ni–Mo–Ti alloy steel (HPM) have been in-service for 76,500 h as cracking tubes in an ethylene plant and they are expected to provide reliable service for 100,000 h (11.4 years) or more. During service, the tube inner surfaces were operated at temperature in the range of 820–835 °C within which thermal cracking process occurred. These aged tubes were assessed to ensure continued safe operation. The assessment of material degradation was carried out using optical microscopy, scanning electron microscopy (SEM) in combination with energy dispersive X-ray (EDX) analysis, X-ray powder diffraction (XRD) analysis, Vickers microhardness measurement and stress rupture test to obtain stress–Larson–Miller parameter (LMP) curves for remaining life prediction. Results showed that microstructural degradation was observed at the inner surface of the radiant tubes marked by the damage of protective oxide film containing Cr₂O₃, Fe₂O₃ and SiO₂. Once this film was removed, carburization occurred and free C atoms involved during cracking of ethylene easily penetrated along austenitic grain boundaries. In addition, carbon diffusion into the tube metal seemed to promote precipitation of Cr₂₃C₆ at grain boundaries and within the grains resulting in a sharp increase in hardness. The outer surface of the radiant tubes, on the other hand, was exposed to higher temperature, typically 1040–1100 °C during operation and creep damage seemed to be the main cause of material degradation. Based on stress rupture test, the remaining life of the radiant tubes is expected to be 21,107 h (2.4 years) consistent with the design life. In the present investigation, factors affecting creep are discussed.     

A beam steering antenna for X-band high power applications

There is a considerable interest in the antennas which have high power handling capacity with beam steering functionality. The design of narrow side waveguide slot-array antenna for high power applications is introduced in this paper. An approach to achieve a uniform radiation slot waveguide antenna is presented. The large scale array antenna can be composed of such antenna cells. Moreover, it is possible to realize beam steering in the azimuth direction by adjusting the broad wall dimension of the waveguide. Besides, this slot waveguide antenna is expected to have high power handling capacity in vacuum environment, because there is no dielectric or electric field enhancement inside the antenna.     

系统级HPM效应的方法研究和计算评估

文章提出进行系统级HPM效应模拟仿真的4个关键环节，对分析电子系统HPM效应的方法和途径进行了初步探讨。通过系统拓扑的分析，建立了系统的HPM效应模型，对其中的两个主要的耦合途径，运用BLT方程分析线缆耦合，用数值计算方法分析孔缝耦合，从而确定到达系统内部某一敏感器件上的电磁能量。最后，对一个典型系统模型进行分析和计算，评估HPM对该系统的作用效应。     

虚阴极微波器件的进展

简要介绍各种虚阴级振荡器的实验进展。分析了这些微波源的性能和军事应用，最后评论了它们的发展前景。     

强电磁脉冲对引信执行级电路辐照效应分析

研究了强电磁脉冲（UWS-HPM）对某型无线电近炸引信执行机构电路产生的效应。建立了UWS-HPM与引信执行级电路耦合的等效电路；利用节点电压法计算了电路参数，分析了影响UWS—HPM与引信执行级电路耦合的因素；利用OrCAD电路设计系统中的PSpiceA／D程序进行了仿真试验。仿真试验结果表明：UWS—HPM是使引信执行机构发火的原因。通过UWS-HPM与执行电路之间的耦合效应在执行机构电路中产生的快速变化的电压使晶闸管导通。利用UWS—HPM源对自制执行机构单元电路进行辐照效应试验，验证了仿真试验结果和分析结论。     

高功率微波条件下的无源互调问题综述

由于高功率微波(HPM)武器的应用和电子系统的复杂化,无源互调(PIM)问题变得日益突出.本文介绍了PIM问题的由来、发展概况,以及存在的问题,并且对无源互调产物(PIMP)的效应、预测和测量作了详细的论述.     

一种S波段高功率微波馈源系统的设计

在高功率微波辐射技术中,馈源系统是天线系统的最终功率容量限定因素,因此高功率馈源系统的设计成为关键。本文设计了一种S波段高功率微波天线的馈源系统,该系统由双模圆锥喇叭和矩-圆模式转换器两部分组成。理论设计与电磁仿真和实际测试的结果基本吻合,E面和H面方向图在照射区域内等化良好(误差电平≤1dB),功率容量达到150MW,且该馈源系统已成功应用于7.3m卡塞格仑高功率微波天线。