Random Vibration Analysis of the Electronic Equipment Cabinet

In order to understand the vibration characteristic of system structure of electronic equipment cabinet within the particular vibration frequency,the finite element analysis software-ANSYS is used to simulate the tests of random vibrations of the cabinet system and obtain the isopleths graph of deformation and stress of the cabinet.It can confirm maximum of deformation and stress of the cabinet and position happened.Through more analysis of the frequency response curve,which can confirm harm- ful consequences random vibrations caused and weak link of the cabinet structure.The numerical simulation results are in good a- greement with the experimental results.It shows that this research provides an efficient method for the anti-seismic design and the dynamic optimization design.

Special Issue on Electromechanical Coupling Design for Electronic Equipment

With the development of electronic equipment to high accuracy, high density, high frequency, and atrocious ser- vice environment, the functional surface in this type of equipment has increasingly serious problems,

Coupling Modeling for Functional Surface of Electronic Equipment

High performance electromechanical equipment is widely used in various fields, such as national defense, industry and so on [ 1]. In addition, the technical level of high performance electromechanical equipment is the embodiment of the national level of science and technology.

Research on Fault Prediction of Modern Aviation Electronic Equipment Based on Improved Grey Model

The basic principle and method of Grey Model prediction are presented. In view of the defects of general GM(1,1) model, an improved method is proposed. That is using the particle swarm optimization algorithm to obtain the best forecast dimension and using metabolism to make the model parameters adaptively change. Finally, the improved Grey Model is used to predict the fault of high voltage power supply circuit of a certain type of modern air-borne radar. The results which are computed and simulated by Matlab software show that the forecast precision of improved Grey Model is higher than that of original Grey Model.

Modern Maintenance Strategy of Electronic Equipment in Complex Electromechanical System

In this paper, the failure mechanism of electronic equipment was analysed.Aiming at the limitation of traditional maintenance modes, modern maintenance strategy was putforward on the basis of reliability-centered maintenance ( RCM) combined with condition-basedmaintenance ( CBM) and maintenance efficiency review (MER). A maintenance management informationsystem was constructed for electronic equipment for the purpose of failure analysis, reliabilityevaluation, and maintenance decisions such as time, mode, and plan. The best maintenance time couldbe predicted with failure analysis and reliability evaluation, which was mainly influenced byenvironmental stress. Suitable maintenance modes should be determined from equipment importance,failure aftereffect, maintenance condition, and economical power so as to ensure equipmentreliability and decrease the requirement of the maintenance source.

Comparative studies on hydrometallurgical treatment of smelted low-grade electronic scraps for selective copper recovery

A comparison of three hydrometallurgical methods for selective recovery of copper from low-grade electric and electronic wastes was reported. Scraps were smelted to produce Cu？Zn？Sn？Ag alloy. Multiphase material was analyzed by SEM？EDS and XRD. The alloy was dissolved anodically with simultaneous metal electrodeposition using ammoniacal and sulfuric acid solutions or leached in ammonia？ammonium sulfate solution and then copper electrowinning was carried out. This resulted in the separation of metals, where lead, silver and tin accumulated mainly in the slimes, while copper was transferred to the electrolyte and then recovered on the cathode. The best conditions of the alloy treatment were obtained in the sulfuric acid, where the final product was metal of high purity （99% Cu） at the current efficiency of 90%. Ammoniacal leaching of the alloy led to the accumulation of copper ions in the electrolyte and further metal electrowinning, but the rate of the spontaneous dissolution was low. Anodic dissolution of the alloy in the ammonia？ammonium sulfate solution led to the unfavorable distribution of metals among the slime, electrolyte and cathodic deposit.

Making your own Automatic Test Equipment has never been easier

Using Planet ATE's SOC 'all-in-one' pin electronics solutions it is easy to make your owntester, ATE or to modify load boards for more advanced test capabilities.

Dynamic temperature prediction of electronic equipment under high altitude long endurance conditions

Unmanned Aerial Vehicle（UAV） is developing towards the direction of High Altitude Long Endurance（HALE）. This will have an important influence on the stability of its airborne electronic equipment using passive thermal management. In this paper, a multi-node transient thermal model for airborne electronic equipment is set up based on the thermal network method to predict their dynamic temperature responses under high altitude and long flight time conditions. Some relevant factors are considered into this temperature prediction model including flight environment,radiation, convection, heat conduction, etc. An experimental chamber simulating a high altitude flight environment was set up to survey the dynamic thermal responses of airborne electronic equipment in a UAV. According to the experimental measurement results, the multi-node transient thermal model is verified without consideration of the effects of flight speed. Then, a modified way about outside flight speed is added into the model to improve the temperature prediction performance. Finally, the corresponding simulation code is developed based on the proposed model. It can realize the dynamic temperature prediction of airborne electronic equipment under HALE conditions.

Recovery of Metals from Anodic Dissolution Slime of Waste from Electric and Electronic Equipment（WEEE） by Extraction in Ionic Liquids

The recovery of metals from a multi-component alloy obtained by crushing, melting and anodic dissolution of waste from electric and electronic equipment（WEEE） was investigated. The anodic dissolution of the alloy was carried out in an electrolysis cell with one copper cathode and a central cast anode, immersed in the electrolyte formed by choline chloride-ethylene glycol-iodine. The temperature of the electrolyte during the process was 343 K. Depending on the electrolysis parameters（current density and cell voltage）, cathodic deposits of Sn, Pb and Zn of 〉99% purity were obtained. Cyclic voltammetry was used in order to determine the deposition potentials of the studied metals. The obtained metallic deposits were subject of determination of XRD, SEM/EDX and AFM in order to evidence the deposits structure and morphology. The experiments performed demonstrated the possibility of separating/selective recovery of metals from the multi-component alloy resulted from the waste from electrical and electronic equipment by anodic dissolution in ionic liquids.

Application analysis of efficient heat dissipation of electronic equipment based on flexible nanocomposites

The efficient heat dissipation of electronic equipment is very important,its heat dissipation performance directly determines the life of the equipment itself.A hand-held electronic communications equipment,when used in surface temperature is exorbitant,need to heat dissipation equipment efficiently,to ensure that the use of comfort in the handheld.In accordance with this requirement,this article presents a flexible composite material based on nano-efficient cooling methods that can keep the layout,through the improvement of internal thermal path,it can achieve the effective heat dissipation.The network thermal resistance method is used to analyze the heat transfer in the equipment,and the thermal analysis of the local thermal resistance is carried out.At the same time,through the modeling of electronic equipment and the analysis of finite elements,the temperature drop of the equipment after improvement is accurately judged.Finally,the device experimental performance comparison before and after the optimization of the standby mode and working mode is verified.The results show that the optimized equipment heat source temperature can be reduced by up to 8.5℃,the surface temperature of the equipment can be reduced by about 5℃~7℃,and the final control equipment in the steady standby state of the temperature of about 39±0.5℃,to ensure the comfort of use,and also improved the service life of the equipment.The efficient thermal design of electronic equipment based on flexible nanocomposites can provide a convenient and reliable cooling solution for high-heat flow density devices.

Managing economic and social profit of cooperative models in three-echelon reverse supply chain for waste electrical and electronic equipment

In addition to maximizing economic benefits, reverse supply chains should further seek to maximize social benefits by increasing the quantity of waste electrical and electronic equipment （WEEE）. The paper investigates cooperative models with different parties in a three-echelon reverse supply chain for WEEE consisting of a single collector, a single remanufacturer, and two retailers based on complete information. In acldition, the optimal decisions of four cooperative models and the effect of the market demand of remanufactured WEEE products and the market share of two retailers on the optimal decisions are discussed. The results indicate that optimal total channel profit and recycle quantity in a reverse supply chain are maximized in a centralized model. The optimal total channel profit and recycle quantity increase with an increase in the market demand of remanufactured WEEE products. The three-echelon reverse supply chain consisting of duopolistic retailers maximizes total channel profit and recycle quantity in a reverse supply chain fbr WEEE.

Transport of Relativistic Electrons Scattered by the Coulomb Force and a Thermionic Energy Converter with a Built-in Discharge Tube

A transport equation of momentum for relativistic electrons scattered isotropically was previously reported. Here, a momentum-transport equation for relativistic electrons “scattered anisotropically” by the Coulomb force is inquired into. An ideal plasma consisting of electrons and deuterons is treated again. Also, to raise a generation-ability of a thermionic energy converter, a means of introducing external electric and magnetic fields within “a converter in which an emitter plate and a collector plate face simply each other” is proposed.

电子对抗装备原理与运用课程的精品建设研究

为提升我院电子对抗装备原理与运用课程的水平,分析了该课程建设现状;针对该课程建设存在的主要问题,阐述了精品课程建设的内涵要求,提出了具有针对性的课程建设方法.教学实践表明,该方法是有效的,可为军校其他主干课程的建设提供借鉴.

基于ATML标准的SCATS在机载电子系统通用自动测试设备中的应用

SCATS是一款由成都天奥测控技术有限公司开发的,基于最新AMTL标准的面向信号的国产自动测试程序集开发软件;ATML标准的显著特征,便是采用了可扩展标记语言(XML),以实现测试信息描述的标准化和测试信息的可交互,通过生成的基于ATML标准的描述文档,实现对被测对象的特征信息、测试信号、测试路径、测试策略、故障诊断等内容的表述,进而实现通用测试设备的通用化设计,有效克服了传统面向信号的测试设备测试程序集开发软件存在的语言形式复杂、信号模型少、软件架构开放性差等不足;SCATS软件采用纯中文开发界面,测试程序集采用无代码开发,软件界面友好、可读性强,大大降低了测试程序集开发人员的技术门槛,内置信号模型丰富可满足现代机载电子系统测试需求;通过在机载电子系统通用测试设备中的应用表明,使用SCATS软件开发的机载电子系统测试程序集具有开发速度快、故障定位准确、通用性和可移植性好等特点。

新时期汽车维修技术质量提高的方法

本研究为了探索提高汽车维修技术质量的有效方法,确保行业能够适应技术进步和市场需求的变化。研究内容涵盖了汽车维修检测相关方法,采取加强电子诊断技术的应用、引进先进维修设备、强化人员管控以及构建监督管理机制等关键策略,确保能够有效提升维修工作的精确度和效率,进而显著提高汽车维修服务的整体质量和顾客满意度。以此推动汽车维修行业的技术进步和服务优化,具有重要的实践和理论价值。

载人航天舱内设备单机插拔装置设计及验证

为提高载人航天舱内电子设备的在轨维修性和可操作性,综合考虑轻量化便携、人因工程学和结构动力学性能等因素,采用分体式可调节设计技术设计一种新型的舱内电子设备单机在轨安装与脱离的插拔装置。采用多刚体动力学仿真分析对装置结构动力学性能进行验证,采用有限元仿真分析对曲柄抗扭性能进行验证。最后,通过实物操作验证装置在真实工作状态下的可行性和有效性。

基于MBD的电子装备研发数字化集成协同环境构建

电子装备的研发是一项复杂且系统化的工程,而现有研发模式下存在多专业协同不足、产品研发周期长、技术状态变更频繁、研发成本高等问题,已无法满足市场需求。针对上述问题,以产品研发流程再造和优化为基础,开展数字化集成协同研发环境构建,系统性探索产品多专业协同、多领域共享的研发管控模式。通过基于模型定义(Model-based Definition,MBD)技术,规范了装备研制过程,实现了电子装备基于xBOM的数字化定义和数字量的传递,以及设计工艺一体化数据管理,从而提高了研发效率,缩短产品研制周期10%以上,设计重用率超过30%,降低了研发成本,提高了装备的性能和可靠性。

基于数据挖掘技术的现代电子设备运行状态辨识研究

针对当前现代电子设备运行状态辨识错误率大、耗时过程长等局限性,为了改善现代电子设备运行状态辨识正确率,设计基于数据挖掘技术的现代电子设备运行状态辨识方法。首先采集电子设备运行状态数据,采用小波变换对数据进行预处理,并提取电子设备运行状态特征,然后采用数据挖掘技术分析电子设备运行状态变化规律,建立辨识模型,最后与其它方法进行电子设备运行状态辨识对比实验。实验结果表明,所提方法的电子设备运行状态辨识正确率高,将辨识误差控制在10%以内,不仅完全可以满足现代电子设备的实际应用要求,而且辨识整体效果要优于对比方法,具有十分明显的优越性。

基于模式识别的舰船机械电子设备故障自动监测

舰船机械电子设备故障数据量较为庞大,且模式复杂多样,为满足其复杂性的要求,提出基于模式识别的舰船机械电子设备故障自动监测方法,采集舰船机械电子设备运行中的温度、压力、振动等数据作为故障监测的原始数据,计算数据间的相似系数和欧氏距离,结合K均值算法实现数据聚类处理。通过小波包算法对聚类后的数据进行特征提取,将其输入到卷积神经网络中,通过对监测模型进行训练,最终实现对舰船机械电子设备故障自动监测。通过实验分析,该方法与相关人员进行监测的故障情况高度一致,在不同故障类型监测的时间均能够保持在5 ms以内,具有较高的监测效率和监测精准度。

一种电工电子多功能实训装置的设计

电工电子实训装置是工科类专业必不可缺的技能教育装备,设计了一种电工电子多功能实训装置,结合虚拟仿真平台及真实的岗位工作需求,满足了电工电子实训教学的全面性要求。