五轴式灯具配光测试设备

为了实现摩托车灯具配光性能的自动化测试,研制了一套五轴式灯具配光测试设备。介绍该五轴测试设备的工作原理,设计了具有X、Y、Z、A、C 5个运动方向的机械结构,建立了以运动控制卡、输入输出板HY-6120为基础的控制系统和以光度计为核心的测试系统,编写了测试设备的软件程序,并在该设备上进行了摩托车灯具配光性能测试验证。研究表明:研制的五轴式配光测试设备可以实现摩托车前照灯、前位灯、后位灯、致动灯、转向灯等类型灯具配光性能的自动化测试,具有较高的测量精度和效率。测试设备已投入正式使用并满足摩托车灯具的配光性能测试需要。     

基于虚拟仪器的伺服阀测试系统设计与实现

液压伺服阀具有响应速度快等优点,其性能直接影响设备的整体性能。为保证伺服阀的质量和设备的正常的运行,设计一套基于虚拟仪器的伺服阀性能测试系统。利用该系统对伺服阀性能参数进行测试。结果证明：相比于传统的基于VB/CAT的伺服阀性能测试系统,所设计的系统具有设备组成简单、编程简单、测试精度高、响应性好等优点,能够可靠地完成伺服阀主要性能的测试,保障设备的安全运行。     

外军装备目标特征信号测试设备及其特性研究

介绍了雷达、红外、光学目标特征信号测试设备的研究情况。 重点分析了矢量网络分析仪、RCS测量雷达、光谱仪、热成像系统等测试设备的特性及技术参数等。     

50 MN挤压机改造张力柱的应力应变测试分析

50MN水压机是某铝厂最大吨位的挤压机,由于设备陈旧老化,自动化程度低、生产效率低、产品质量差,设备亟需改造.本文以挤压机四根张力柱作为测试对象,设计合理测试方案,使用静态电阻应变仪在挤压机实际生产过程中测试张力柱的应力应变,对比设备改造前后测试结果,确认四根张力柱的应力状态是否均布,从而提高设备的使用安全性.     

热平衡测试过程中现场条件的制约因素及其克服措施

热平衡测试是考察设备能量利用水平、降低能耗的重要而行之有效的科学手段之一。本文根据设备工艺流程和现场具体条件,结合测试工作实际,分析了制约热平衡测试与计算工作的因素,并提出了相应的克服措施。     

基于VXI总线技术的飞机伺服阀测试数采系统设计

介绍了基于VXI总线技术的伺服阀测试台测试系统的设计方法以及VXI总线设备在Lab VIEW编程环境下数据采集的实现方式,描述了该伺服阀测试系统需要应用VXI总线设备实现的功能,说明了VXI总线设备在Lab VIEW编程环境下的软件设计方案。系统具有较好的实用性,可以带来较好的经济效益和社会效益,为基于VXI总线的测试系统设计提供了参考。     

三相大功率电压暂降抗扰度测试系统研制

我国孤焊设备电磁兼容性要求国家标准GB 15579.10自2009年开始强制执行,因此急需研发针对孤焊设备的电磁兼容测试设备.以电焊机电磁兼容问题之一的电压暂降抗扰度问题为研究基础,开发了应用于电焊机的三相大功率电压暂降抗扰度测试系统.测试系统以MSP430F449单片机为控制核心,以WEINVIEW MT506触摸屏...     

工业炉最佳管理系统

一、前言最新的热处理测试设备系统的特点就在于通过引入计算机,可提高节省能源、多品种小批量生产能力以及产品质量的稳定性。一旦在对炉体设备进行更新,提高生产效率的同时改善能耗的测试设备系统要解决的重要课题是,燃料的优化、工艺程序的效率化     

基于电液比例控制的围岩加载超高压液压系统的研制

为了满足某煤矿科研单位测试围岩混凝土桩柱的承载能力并记录其力学性能数据的要求,专门研制一台围岩加载试验测试设备。该设备能测定长6 000 mm、最大直径1 400 mm的圆筒状围岩混凝土,以便研究煤矿巷道或隧道围岩混凝土的力学性能。测试时采取液压缓慢连续加载的方式。     

水压测试设备的计算机数据采集系统

计算机被广泛应用在各种检测设备中。本文从硬件和软件两方面阐述了水压测试设备的计算机数据采集系统,提供了笔者在设计和使用过程中的经验和注意事项。该系统已成功应用于胶管的耐压测试中。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Thermodynamics Study on the Decomposition of Chromite with KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

Influence of Heat Treatment on Damping Behaviour of the Magnesium Wrought Alloy AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

Using Finite Element and Contour Method to Evaluate Residual Stress in Thick Ti-6Al-4V Alloy Welded by Electron Beam Welding

This work was to reveal the residual stress profile in electron beam welded Ti-6Al-4V alloy plates(50 mm thick) by using finite element and contour measurement methods.A three-dimensional finite element model of 50-mmthick titanium component was proposed,in which a column–cone combined heat source model was used to simulate the temperature field and a thermo-elastic–plastic model to analyze residual stress in a weld joint based on ABAQUS software.Considering the uncertainty of welding simulation,the computation was calibrated by experimental data of contour measurement method.Both test and simulated results show that residual stresses on the surface and inside the weld zone are significantly different and present a narrow and large gradient feature in the weld joint.The peak tensile stress exceeds the yield strength of base materials inside weld,which are distinctly different from residual stress of the thin Ti-6Al-4V alloy plates presented in references before.     

Microstructures and Tensile Properties of Ultrafine-Grained Ni–(1–3.5) wt% SiC_(NP) Composites Prepared by a Powder Metallurgy Route

Silicon carbide nanoparticle-reinforced nickel-based composites(Ni–Si CNP),with a Si CNPcontent ranged from1 to 3.5 wt%,were prepared using mechanical alloying and spark plasma sintering.In addition,unreinforced pure nickel samples were also prepared for comparative purposes.To characterize the microstructural properties of both the unreinforced pure nickel and the Ni–Si CNPcomposites transmission electron microscopy(TEM) was used,while their mechanical behavior was investigated using the Vickers pyramid method for hardness measurements and a universal tensile testing machine for tensile tests.TEM results showed an array of dislocation lines decorated in the sintered pure nickel sample,whereas,for the Ni–Si CNPcomposites,the presence of nano-dispersed Si CNPand twinning crystals was observed.These homogeneously distributed Si CNPwere found located either within the matrix,between twins or on grain boundaries.For the Ni–Si CNPcomposites,coerced coarsening of the Si CNPassembly occurred with increasing Si CNPcontent.Furthermore,the grain sizes of the Ni–Si CNPcomposites were much finer than that of the unreinforced pure nickel,which was considered to be due to the composite ball milling process.In all cases,the Ni–Si CNPcomposites showed higher strengths and hardness values than the unreinforced pure nickel,likely due to a combination of dispersion strengthening(Orowan effects) and particle strengthening(Hall–Petch effects).For the Ni–Si CNPcomposites,the strength increased initially and then decreased as a function of Si CNPcontent,whereas their elongation percentages decreased linearly.Compared to all materials tested,the Ni–Si CNPcomposite containing 1.5% Si C was found more superior considering both their strength and plastic properties.     

Directional Growth of Tin Crystals Controlled by Combined Solute Concentration Gradient Field and Static Magnetic Field

A new method was introduced to achieve directional growth of Sn crystals. Microstructures in liquid(Pb)/liquid(Sn) diffusion couples were investigated under various static magnetic fields. Results show that the β-Sn crystals mainly reveal an irregular dendritic morphology without or with a relatively low static magnetic field(B0.3 T). When the magnetic field is increased to 0.5 T, the β-Sn dendrites close to the final stage of growth begin to show some directional character. With a further increase in the magnetic field to a higher level(0.8–5 T), the β-Sn dendrites have an enhanced directional growth character, but the dendrites show a certain deflection. As the magnetic field is increased to 12 T, the directional growth of the β-Sn dendrites in the center of the couple is severely destroyed. The mechanism of the directional growth of the β-Sn crystals and the deflection of the β-Sn crystals with the application of static magnetic field was tentatively discussed.     

电化学噪声数据处理方法概述

综述了常见的电化学噪声数据处理方法,介绍了直流趋势剔除、统计分析、快速傅立叶变换(FFT)法计算功率谱密度(PSD)以及小波变换处理电化学噪声信号的基本过程,并阐释了各种数学处理及所得参数的物理意义。