免烧砖自动生产设备液压回路系统设计分析（英文）

随着城市建设的不断发展,道路建设对强度高,成本低的免烧砖的需求量与日俱增,传统的生产设备已无法满足需求,因此需要研发能够适应大产量、高质量的生产装备。提出一种自动挤压成型方案,采用系统参数设计理论和AMESim系统仿真技术,完成免烧砖自动生产设备模压成型液压回路的系统设计以及给出主要元件的选型计算。基于AMESim的HCD液压元件设计库建立系统回路仿真模型,分析各回路系统运动特性和流量特性,并验证系统设计的合理性。     

基于AMESim的一种速度滑冰起跑训练器建模与仿真

速度滑冰是我国冬季奥运会的金牌重点争夺项目,目前的训练方法效率低,不利于运动员力量的提升及技术动作的掌握,因此需要研发新型的训练器械,高效帮助运动员进行起跑训练。提出一种速度滑冰起跑训练器,采用系统参数设计理论和AMEAim系统仿真技术,完成速度滑冰起跑训练器液压回路的系统设计。基于AMESim的液压元件设计库建立系统回路仿真模型,分析各回路系统压力特性、流量特性和扭矩特性,并验证系统设计的合理性。     

工程机械的节流调速液压回路仿真分析

针对传统液压回路仿真方法中存在的建模繁琐、参数调节复杂等缺点,以采用压力补偿器和比例方向阀的进口节流调速回路为例,利用AMESim 的元件设计库构建了压力补偿器的模型,建立了节流调速回路的仿真模型.对进口节流调速回路在工程应用中的3个主要特性进行了仿真,结果表明:这种仿真方法不但简化了建模过程和参数调节,而且能较好的反映出系统的动态性能,对液压系统的动态特性研究和设计改进有积极作用.     

基于PLC与电液伺服的油罐清洗机器人控制系统设计

为满足作业安全性和操作灵活性要求,设计了油罐清洗机器人全液压控制系统。分析机器人结构特性及功能,确定组成油罐清洗机器人液压控制系统的各组成部分;根据各组成部分的工作原理和过程,设计机器人的液压系统回路,并分析在回路基础上各功能的实现过程;分别进行了PLC控制系统和电液伺服控制系统设计,根据回路各元件的传递函数建立了整个系统的传递函数,为各元件的选型及整个回路的仿真分析奠定了理论基础。     

基于AMESim软件的散热器片冲裁机液压系统设计

散热器片冲裁液压系统在散热器片生产中起重要作用,其工作性能直接影响着生产线的效率和产品的质量。该散热器片冲裁机液压系统是由冲裁回路和支撑回路组成,利用液压缸的往复运动来实现冲裁机的冲裁动作。根据设备要求,设计出适合主机的液压传动系统,并在AMESim环境中建立了该液压系统的仿真模型,对其动态特性进行了仿真分析,验证了方案的可行性。该液压系统现已通过调试投入生产,运行状况良好。     

基于AMESim和MATLAB的隧道多功能台车联动调平回路仿真分析

对隧道多功能作业台车液压系统的联动调平回路进行设计。从调平油缸的运动特性和联动调平问题角度出发,分析隧道多功能作业台车液压系统的联动调平回路可行性。并利用AMESim和MATLAB软件建立仿真模型进行联合仿真。根据仿真数据,所设计的回路能够满足实际工况要求。     

植物纤维模塑制品自动生产线的液压系统设计

以植物纤维模塑制品自动生产线为研究对象,分析该生产线的工艺流程和工艺技术要求,提出一种优化的植物纤维模塑制品自动生产线液压系统设计方案,设计了自动生产线液压系统回路,计算了液压元件的技术参数并进行组装试验。与气动分体式生产设备对比表明,单个产品的时间效率可提升约25%,日产量提升约50%。因此液压自动生产线设计合理,满足工艺要求且运行可靠稳定,具有很好的经济和社会效益。     

升系统平衡阀定阻尼孔设计研究

针对于一种车载举升系统平衡回路中平衡阀的阻尼孔参数对液压系统回路的影响进行了研究,分析了平衡回路和平衡阀的工作原理,采用AMESim仿真软件建立举升系统液压平衡回路模型,仿真分析了平衡阀在不同内部定阻尼孔直径下液压平衡回路的动态特性,由仿真结果得到定阻尼孔设计原则,为此类平衡阀的设计与改进提供一定参考。     

液压逻辑元件及其在组成集成回路时的应用

近年来在生产设备中越来越多地采用液压传动。同时,不论在技术方面,还是在经济方面,对液压传动设备参数的要求愈来愈高。因此,在液压元件及液压回路的组成方面,不仅力求改善目前传统液压元件的品种,而且还要探讨新型的元件和系统,以满足不断增长的技术和经济上的要求。液压逻辑元件及集成回路就是其中的一种。 本文引述了各种类型的液压逻辑元件、它们的联接及在液压回路上的应用;详细叙述了组成液压集成回路时应用带有逻辑元件的通用组合块的可能性及其结构;最后指出了采用带逻辑元件的液压回路与采用带滑阀式换向阀的传统系统相比,在技术上和经济     

举升系统平衡阀定阻尼孔设计研究

针对于一种车载举升系统平衡回路中平衡阀的阻尼孔参数对液压系统回路的影响进行了研究,分析了平衡回路和平衡阀的工作原理,采用AMESim仿真软件建立举升系统液压平衡回路模型,仿真分析了平衡阀在不同内部定阻尼孔直径下液压平衡回路的动态特性,由仿真结果得到定阻尼孔设计原则,为此类平衡阀的设计与改进提供一定参考。     

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。