Research on a MEMS pyrotechnic with a double-layer barrier safety and arming device

As an essential component of ammunition, pyrotechnics can control ignition with high reliability. However, due to limits of fabrication technology, traditional pyrotechnics are bulky. To achieve both functionality and miniaturization, MEMS pyrotechnics integrate initiator, safety-and-arming (S&A) device and lead charge and keep all components within a small size. MEMS S&A devices, as the core component to ensure system safety, are difficult to achieve active and rapid response to control signals with high safety and reliability. In order to overcome the difficulty, we propose the design and characterization of a MEMS pyrotechnic with a double-layer barrier S&A device. The MEMS pyrotechnic is a high-integrated device with an overall size of 13.4 × 8.5 × 5.2 mm³. The initiator is a NiCr bridge foil covered with an Al/CuO energetic film, which can generate flame when ignited by an excitation voltage. To match the flame energy, lead styphnate is chosen in this study as the lead charge. The S&A device contains four semi-circular barriers, which are directly driven by V-shape electro-thermal actuators to gain active control of the pyrotechnics' ignition condition with rapid response. To improve the system's reliability, the four barriers are axisymmetrically placed in two layers, two barriers for each layer, to constitute a double-layer structure with a thickness of 100 μm. The ignition test results show that the S&A device can prevent the initiator from detonating the lead charge in safety condition. In arming condition, the lead charge will be detonated.     

Research on design and firing performance of Si-based detonator

For the chip integration of MEMS (micro-electromechanical system) safety and arming device, a miniature detonator needs to be developed to reduce the weight and volume of explosive train. A Si-based micro-detonator is designed and fabricated, which meets the requirement of MEMS safety and arming device. The firing sensitivity of micro-detonator is tested according to GJB/z377A-94 sensitivity test methods: Langlie. The function time of micro-detonator is measured using wire probe and photoelectric transducer. The result shows the average firing voltage is 6.4 V when the discharge capacitance of firing electro-circuit is 33 μF. And the average function time is 5.48 μs. The firing energy actually utilized by Si-based micro-detonator is explored.     

虚拟战场的实时四声道立体声合成

面向虚拟战场提出了实现实时四声道立体声合成的简化算法。针对四声道立体声的特殊性 ,首先探讨了四声道立体声系统中扬声器的配置方案。在四声道立体声系统扬声器配置方案的基础上 ,解决了单声源的表示、声强衰减及实时立体声化问题 ,然后提出一种评价混声效果的标准及一个评价声源对整个声音所作贡献的公式 ,并由此提出一个混声公式 ,从而解决了多声源环境的实时混声问题。该套算法用于应用系统 ,取得了较好的效果。     

微电子器件方波EMP注入敏感端对的实验研究

采用方波注入法,对国外某知名公司生产的两个批次的晶体管进行了实验,比较了从CB结反向注入与从EB结反向注入的损伤电压值,发现该类器件的EMP敏感端对与人们一般研究的结论有所不同。     

复杂声场环境下的近场声全息技术

近场声全息对测量环境的严格要求限制了它在工程实际中的应用,特别是利用互谱法求解全惠面声压时,参考信号的获取极为关键.针对有多个噪声源同时存在的复杂声场环境,提出一种工程解决方法,利用振动信号和声源出口处的信号作为近场声全息的参考信号,在传递函数法的基础上推导出全息面上分离的复声压,由此达到复杂声场环境下的近场声全息重建...     

电磁辐射对桥丝式电火工品性能影响研究

利用传导方法研究射频对桥丝式电火工品的桥丝电阻、烤爆、迟发火以及瞎火等性能影响。研究结果表明,在10％发火功率和0．4MHz的敏感频率条件下,所研究的3种电火工品在照射1～5min后,电阻增加1.2％～7．4％,并且17．3％的试样在照射的过程中出现了烤爆;在对经过照射后的试样进行正常的发火感度试验中,发火时间显著增加,出现了不同程度的迟发火,16．9％的试样瞎火。     

基于虚拟仪器的液压增压器模拟装置

为搭建指控系统维修和模拟训练平台,根据液压增压器的工作原理,建立液压增压器的数学模型,在此基础上采用虚拟仪器技术和单片机技术设计并实现了液压增压器模拟装置。试验结果表明模拟装置与指控系统连接,能够正确地完成液压增压器的实时模拟功能,模拟结果与实物一致。     

面向空间应用的GaN功率器件及其辐射效应

研究氮化镓(GaN)功率器件及其辐射效应对于解决空间应用需求、促进新一代航天器建设具有重大意义。介绍了GaN功率器件的主要结构及工作原理,综述了近年来国内外在GaN功率器件的总剂量效应和单粒子效应两方面的研究进展,并对辐射效应在GaN功率器件中造成的退化和损伤机制进行分析与讨论。研究结果显示：GaN功率器件具有较强的抗总剂量能力,但是抗单粒子能力较弱,易发生漏电和单粒子烧毁,且烧毁点多发生在栅极边缘的漏侧。对GaN功率器件辐照损伤机理的研究缺乏权威理论,有待进一步探索,为其空间应用提供理论支撑。目前,平面结构的GaN功率器件是主流的技术方案,单片集成及高频小型化是GaN功率器件未来发展的方向。     

用错误围堵策略建立可生存的网络安全设备内核

提出在IBM虚拟机器的架构上,使用错误围堵策略建立可生存的网络安全设备内核的思想。建立有效的资源管理器,分割、调度机器资源,把物理资源提供给虚拟机器,平衡错误围堵与其它的性能要求。利用软件和硬件错误围堵技术制约对系统攻击引起的错误,防止一个错误引起整个系统的崩溃。用以上策略建立了内核模型,给它加上大负荷,正常和异常的工作。实验结果显示:即使在系统中某些部分出错的情况下,依然不影响系统的整体性能,并且错误围堵的开销几乎可以忽略不计。     

ESD对微电子器件造成潜在性失效的研究综述

静电放电(ESD)潜在性失效问题是当前微电子工业面临的可靠性问题之一,并且越来越引起人们的重视。国内外学者在微电子器件ESD潜在性失效的检测及探讨失效机理方面的研究取得了较大的进展。研究表明:MOS电路等微电子器件,在ESD作用下确实存在潜在性失效问题。因此,开展ESD潜在性失效研究具有重要意义。