Intelligent Road Safety System Based on Multi-Function Warning Device

A warming device for car driving is proposed in this paper,which includes support rods and warning plates.In this device,several display screens are insalled on one side of the warning panel.Indicator lights are set on the display screen.A waning board is mounted on the top box.Several radar detectors are mounted on one side of the top box,and the radar detectors orrespond to the display screens.Several waming lights are installed on the top box,and the waning lights orespond to sevenl radar detectors.The sliding side of the support rod cleans the unit.The change of positions of the indicator lights based on the radar detectors will be rellected on the display screens,which allows drivers to understand the situation of the road.Therefore,they can prepare for changing lanes and overtaking,and understand the position and speed of all vehicles in this road section in advance.

Fabrication of Fuze Micro-electro-mechanical System Safety Device

Fuze micro-electro-mechanical system（MEMS） has become a popular subject in recent years.Studies have been done for the application of MEMS-based fuze safety and arm devices.The existing researches mainly focused on reducing the cost and volume of the fuze safety device.The reduction in volume allows more payload and,thus,makes small-caliber rounds more effective and the weapon system more affordable.At present,MEMS-based fuze safety devices are fabricated mainly by using deep reactive ion ething or LIGA technology,and the fabrication process research on the fuze MEMS safety device is in the exploring stage.In this paper,a new micro fabrication method of metal-based fuze MEMS safety device is presented based on ultra violet（UV）-LIGA technology.The method consists of SU-8 thick photoresist lithography process,micro electroforming process,no back plate growing process,and SU-8 photoresist sacrificial layer process.Three kinds of double-layer moveable metal devices have been fabricated on metal substrates directly with the method.Because UV-LIGA technology and no back plate growing technology are introduced,the production cycle is shortened and the cost is reduced.The smallest dimension of the devices is 40 μm,which meets the requirement of size.To evaluate the adhesion property between electroforming deposit layer and substrate qualitatively,the impact experiments have been done on the device samples.The experimental result shows that the samples are still in good condition and workable after undergoing impact pulses with 20 kg peak and 150 μs duration and completely met the requirement of strength.The presented fabrication method provides a new option for the development of MEMS fuze and is helpful for the fabrication of similar kinds of micro devices.

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 mm^(3). The initiator is a Ni Cr bridge foil covered with an Al/Cu O 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.

Safety control for powder compaction of initiating explosive device

Powder compaction is one of the most crucial processes in initiating explosive device manufacturing. The quality of powder compaction may influence the performances of product directly. Traditional powder compaction mainly makes use of manual gravitational spiral loading machine or lever loading machine. Potential accident by the strike in powder compaction of initiating explosive device could risk life, property and the environment. To prevent this risk, automatic control system and control strategy can be used to guarantee no strike in pressing process. The scope of this paper is to analyze and review the control strategy for powder compact and discuss the experimental results for the application of the proposed strategy.

Accuracy and Electromagnetic Safety Evaluation of a Portable Electromagnetic Localization System for Micro Invasive Medical Devices in Vivo

Aiming at localizing the telemetric capsule for detecting gastrointestinal physiological parameters in vivo accurately,a portable alternating current(AC)electromagnetic localization system is designed.To verify the feasibility of the method,the model and construction of the localization system are detailed.And static and dynamic accuracy of the localization system are tested by experiments.Next,we compare the simulating results of the electromagnetic radiation aroused by the localization system with the electromagnetic safety standards of human(ICNIRP guidelines and IEEE standard C95.1-1991).Finally,in terms of the results of the static and dynamic experiments,conclusions are drawn that the accuracy of portable positioning system is high(less than 10 mm)enough to satisfy the localization need of the micro invasive medical devices in vivo,and there is no harm of electromagnetic radiation to human.

Study on Net Hauler Safety Device for Fishing Vessels

[Objective] To design a safety device set for fishing vessel net hauler, in order to reduce the severe potential safety hazards in offshore operation. [Method] In view of the operation and structure of net hauler on the fishing trawler, this paper investigated the existing safety protection devices and designed a new set of purely mechanical structure without changing the original structures of the vessel significantly. [Result] Using the easily-adjustable functions of the main shaft of CNC lathe, and simulating the operation performance of different hauling line speeds and testing the safety device, the results showed that the new device could protect the crew from safety accidents caused by net hauler. [Conclusion] The result provides references for the design and application of mechanical protection devices for net haulers on other fishing trawlers.

一种基于DeviceNet现场总线协议的安全通信层设计

以核电站数字仪控系统为背景,以提高网络通信可靠性为目的,提出一种基于Device Net现场总线协议的安全通信层协议设计.本研究通过分析国标IEC61784所提出的八种通信故障,在原协议的基础上扩展了几种安全措施,可以预防以上所有通信故障,保证整个通信系统的可靠性和安全性.本文在硬件平台MICON系统上进行了协议栈的开发和验证,实验证明这些措施能够满足该平台对可靠性及安全性的需求.

Field test and probabilistic analysis of irregular steel debris casualty risks from a person-borne improvised explosive device

Person-borne improvised explosive devices(PBIEDs)are often used in terrorist attacks in Western countries.This study aims to predict the trajectories of PBIED fragments and the subsequent safety risks for people exposed to this hazard.An explosive field test with a typical PBIED composed of a plastic explosive charge and steel nut enhancements was performed to record initial fragment behaviour,including positions,velocity,and trajectory angles.These data were used to predict the full trajectory of PBIED fragments using a probabilistic analysis.In the probabilistic analyses a probability of fatality or serious injury was computed.Based on the results presented,many practical conclusions can be drawn,for instance,regarding safe evacuation distances if a person were exposed to a suspected PBIED.

Feasibility of MRI in Patients with Non-Pacemaker/Defibrillator Metallic Devices and Abandoned Leads

Objective: To evaluate feasibility of MRI in patients with non-pacemaker (PM)/Implantable cardioverter defibrillator (ICD) metallic devices and abandoned leads. Background: Relative safety of MRI performed using specified protocol has been established in MR non-conditional PM/ICDs. With limited safety data, many non-PM/ICD metallic devices and abandoned leads continue to be a contraindication for MRI. Methods: We retrospectively analyzed consecutive patients with extra-cardiac devices, non-programmable cardiac devices, and abandoned leads, who underwent MRI (GE 1.5 Tesla, WI) at a single tertiary care center over a span of 13 years. Scan protocol was designed to maintain specific absorption rate (SAR) < 4.0 W/kg and scan time < 60 minutes. Results: The cohort comprised 127 MRI exams representing 94 patients, with 13 patients having two or more scans. The devices consisted of: 23 vagal nerve stimulators (VNS), 22 implantable loop recorders, 16 spinal stimulators, 5 peripheral nerve stimulators, 3 bladder stimulators, 2 deep brain stimulators, 1 gastric stimulator, 1 bone stimulator, 1 WATCHMAN device, 22 abandoned PM/lCD leads and 1 VNS lead. There was no immediate (peri-MRI exam) morbidity or mortality. Patients did not report any discomfort, palpitations, heating, or sensation of device migration during the exam. Local follow-up data was available in 65% (100% for thoracic imaging) with a mean of 190 ± 475 days (median 13 days). No device malfunction was reported during follow-up. Conclusions: With appropriate precautions, MRI is feasible in patients with extracardiac devices, nonprogrammable cardiac devices, and abandoned leads.

System for the Management of the Continuity of Use of Medical Devices in Hospitals

The Technical Services and the Medical Administration of the Hospitals of Trieste have been working for years to ensure the optimal functioning of the Surgery, Intensive Care, Diagnostics and Research Services offered to the Patients and to the University in an 800-bed hospital complex, transforming and innovating the buildings and support installations. We have dedicated special attention to the technologies necessary to guarantee the continuity of the power supply to the electromedical devices, increasingly numerous in highly specialized hospitals. We report the power of the generator sets and the UPS and our opinion that their power must be related to the overall consumption of the hospital, with a reserve margin.

IoT-Based Wrist Band for Women Safety

In the modern world,women now have tremendous success in every field.They can play,learn,and earn as much as men.But what about safety?Do they have the same secure environment that men and boys do?The answer is“NO”.Women and girls have been subjected to numerous incidents,including acid throwing,rape,kidnapping,and harassment.It is common to read a lot of news like this in newspapers every day.These incidents make women feel unsafe in this society.Our freedom came a long time ago,but women still lack complete security in this society.All women cannot fight or shout all the time when some danger is happening to them.What can the physically challenged person and Children do?To make women feel safe,we designed“Wrist Band”using IoT for women safety.As the sensors sense information from the body,it will always update the information such as pulse,temperature,and vibration to the well-wishers through the Blynk app.

基于激光加工的微安保机构设计与性能

复杂场景下火工品微安保机构需具有可恢复与抗过载特性,为此,研究设计了基于激光加工的金属材质电热驱动微安保机构,采用有限元模拟分析了镍基微电热执行器动作特性,通过调整双热臂U型电热执行器热臂和冷臂的长度、宽度以及各臂之间的间隙,探究它们对输出位移的影响;通过正交实验得到优化的超快激光加工工艺参数分别为频率100 kHz、能量113μJ、切割速度100 mm·s^(-1),实现了镍基电热微安保机构的超快脉冲激光精确制造;最后,搭建了安保机构性能验证平台,验证了该机构在不同电流激励下的驱动位移与隔爆性能。结果表明,在8 A激励电流下,加工的镍基微安保机构驱动位移可达1084μm,所组装的火工品微安保机构在传爆序列中能够有效隔爆。

有限理性决策理论下驾驶信息过载研究及应用

随着汽车网联化和智能化的发展,汽车驾驶过程面临着车内外多源信息过载的影响,这可能会产生交通安全问题.驾驶信息过载包含感知、认知和决策等复杂神经机制.在知识、时间和精力有限的情况下,当驾驶员处于庞大、繁杂、多变环境中排查信息对象并进行决策时,决策都是在有限度的理性条件下进行,且常带有主观因素,这是有限理性决策理论的基本原理.汽车工业界基于有限理性决策理论,根据人的特性研究了AR-HUD控制驾驶信息过载的汽车驾驶辅助技术以及OLED车载显示的应用,驾驶员在面临信息过载时可快速筛选关键信息,做出正确驾驶决策,以此来提升驾驶的安全性.本文通过综述国内外学者在驾驶信息过载原因、生理心理机制以及控制驾驶信息过载的技术和装备等方面的研究成果,为安全驾驶、汽车智能化发展的产学研结合提供参考.

静脉用药安全供送装置研究

基于静脉用药智慧药房的工作要求,设计了一套静脉用药安全供送装置,并以典型静脉用药安瓿瓶为研究对象,在安全供送要求和理论基础上进行分析,确定一种被动的输送带供送方式,并给出药剂安全供送判断的表征参数和安全供送装置机械结构设计。通过建立药剂连续供送的动力学模型,得到的研究结果表明:规格最大的药剂瓶在相互接触作用中形变量最大,安全系数最低;药剂瓶的径高比越大且越接近球形时,其形变量随着速度的增加其变化越小,安全系数下降越慢。因此,不同规格的药剂瓶可根据实际工作情况分层供送,所设计的供送装置在速度低于5.5 m/min时,相当最大规格药剂出药速度约为250瓶/min,可安全供送;且该装置可进一步应用在物料供送和分拣组合包装生产线中。

基于PLC可控电源保护装置的优化设计

针对以电气设备为主的技能实训操作平台由于有时忘记关闭电源而引发的安全问题,设计一种集操作与保护为一体的电源保护装置。文章介绍该保护装置的结构设计,并从硬件及软件两个方面介绍了控制系统的设计。通过调试运行结果显示,该装置不仅能安全控制设备电源的通断,而且对长时间处于带电状态而无人操作的实训设备实现断电保护功能,在一定程度上消除了实训室的用电安全隐患,降低实训室的管理难度。

主动安全液压支架顶梁装置结构设计与分析

煤壁片帮与顶板冒落是影响煤矿安全开采的重要因素,目前常见的液压支架有效支护面积大,移架脱离顶板时间长,很容易发生煤壁片帮与顶板冒落造成支架再次支护失稳等问题。通过对顶板失稳机理进行分析,建立了等效砌体梁结构的数学模型,计算得到了回采工作面顶板发生破坏的强度条件以及支护面积对顶板发生破坏的影响,同时提出了主动安全液压支架顶梁装置的设计,对现有液压支架顶梁在满足原有功能的基础上,设计了顶梁装置,实现了对顶板的有效支护和相对主梁的步足式移动,达到了液压支架主动安全支护的目的,从而满足降低砌体梁发生破坏的概率。通过对ZY4800/18/38液压支架的改进,并对其进行典型状态下顶梁装置有限元分析,结果满足设计要求。

硅基MEMS安执机构在微爆炸序列中的应用与发展趋势

为适应各类信息化、智能化、微型化武器发展需求,以换能信息化、结构微型化、序列集成化为主要特点的MEMS火工品成为火工品技术发展的重要方向。MEMS安执机构作为MEMS火工品微爆炸序列能量传递的控制机构,是MEMS火工品设计的关键技术之一。本文基于微爆炸序列结构形式对硅基MEMS安执机构进行分类研究,分析不同安执机构的技术原理,探讨其应用进展与研究现状,总结硅基MEMS安执机构微型化、集成化、信息化、智能化发展趋势,为MEMS安执机构的研究与设计提供探讨。

限位自闭锁式引信MEMS安全与解除隔离装置

针对小口径榴弹引信安全与解除隔离装置(安解装置)体积缩小的同时加强冗余保险性能和结构强度的要求,提出了一种基于电铸镍材料的改进型限位自闭锁式引信MEMS安解装置。装置利用后坐环境和离心环境激励特点,加以指令控制的电动推销器实现三道独立冗余保险和延期解除隔离功能需求,区别于传统隔爆机构需要借助额外微弹簧辅助锁紧,该装置隔爆机构借助一种反锁卡簧结构实现限位自闭锁,且能够实现环境激励下的无碰撞反弹一次闭锁到位。利用刚柔耦合动力学和有限元仿真模拟并加以样机试验的手段,探究在规定的技术指标下安解装置的解保动作和闭锁强度。仿真与样机试验结果均表明:所提装置可识别正常发射的后坐和离心环境激励,满足安全解除保险的动作要求且不会发生材料强度失效,该安解装置简单可靠。

一种网-桁架式海上拦截装置仿真分析

针对海上设施的安全防护问题,提出了一种网-桁架式海上拦截装置,目的是在有效拦截来袭小艇撞击的同时尽量降低对拦截装置本身的损伤.为验证这一装置的有效性,基于显式动力学和欧拉-拉格朗日耦合方法对拦截装置拦截小艇过程进行数值模拟,设定小艇垂直撞击支撑柱、支撑柱间隙和45°撞击支撑柱、支撑柱间隙4种工况,每种工况包含10、20、30 m/s 3种速度.通过对这12组仿真的碰撞力、能量以及破损状态分析,全方位分析了该装置的防撞性能和对小艇的拦截效果.所有工况下该装置都能完成对小艇的拦截,说明这种装置具有优秀的拦截效果.

无源植入类医疗器械上市后安全性评价专家共识

无源植入类医疗器械是不依靠电能或其他能源、借助外科手术器械全部或部分进入人体或自然腔道中的一类医疗器械。加强无源植入类医疗器械上市后的风险评价工作,对于全面提升医疗器械全生命周期监管水平具有十分重要的意义。国家药品监督管理局药品评价中心组织相关专家组成专家组,进行讨论指导后最终形成“无源植入类医疗器械安全性评价”专家共识,通过对国内外医疗器械不良事件监测法规体系及案例进行对比分析,结合我国医疗器械不良事件监测现状,将无源植入类医疗器械的上市后安全性评价分为工作体系和技术指导原则,为开展无源植入类医疗器械上市后安全性评价提供参考依据,促进上市后的医疗器械安全性评价工作规范化。