基于VC的汽车空调控制面板测试系统

为测试汽车空调控制面板的性能,保证汽车空调的优异操纵性能,基于VC设计了汽车空调控制面板性能测试系统。对系统测试原理进行阐述,采用平衡状态下的扭矩平衡原理及牛顿第二定律等对空调面板等进行测试,并与理论设计数值进行对比。并对某型号的空调面板进行测试,结果表明:检测数据准确,检测系统各部分性能稳定。此系统可以对空调控制面板性能进行有效的检测,在汽车空调配件厂有很高的应用价值。     

基于人因仿真的卧式加工中心装夹操作舒适性评价方法

为了减少卧式加工中心工件装夹操作疲劳,提高工作效率和加工质量,提出了一种基于人因仿真的卧式加工中心装夹操作舒适性评价方法。从卧式加工中心装夹操作的特点出发,分析了装夹操作舒适性问题根源和影响因素;基于人机学原理,确定了卧式加工中心装夹操作舒适性评价指标;运用层次分析法建立了装夹操作舒适性评价体系;根据模糊评价的基本理论构建了装夹操作舒适性综合评价模型;利用人因仿真技术,以国产卧式加工中心630HF为例进行了装夹操作舒适性的综合评价,验证了文中提出方法的有效性。     

一种可转动的暗装式控制面板装置设计

设计一种可转动的暗装式控制面板装置,通过将控制面板安装在可旋转的面板支架上达到变换控制面板位置的目的,可防止控制面板表面的污损,还可防止受外力冲击造成的控制面板玻璃罩破损或产生误操作。其结构简单、操作方便,可节约机床的占用空间。     

铝土矿床边界品位指标优化方法与初步应用

运用多属性效用理论,对铝土矿床边界品位指标优化:(1)边界品位的优化应以资源、技术、经济三方面作综合评价;(2)各评价目标的重要性不同且不能替代,应作层次分析;(3)用综合效用值优化边界品位,为确定工业指标提供依据。结合实例运用多属性效用理论,对河南某铝土矿床的边界品位进行优化,说明这种理论的应用步骤和应用效果。     

多色集合与模糊遗传算法的机械产品概念设计研究

针对机械产品概念设计中的优化问题,提出了基于多色集合与模糊遗传算法相结合的方案推理及优化方法。首先运用多色集合理论,建立了描述复杂结构机械产品各组成元素间的层次结构和复杂约束关系的信息模型,以进行有效的方案推理。然后,将多色集合推理模型与模糊遗传算法相结合,实现了方案的评价及优化方案的搜索。以工业机械手的概念设计为例对该方法进行了验证,结果表明,该方法能有效地实现概念设计过程中的方案推理及优化,为复杂机械产品概念设计提供了一定的理论基础。     

汽车底盘装配线运行参数仿真分析与优化

以某新能源汽车底盘装配输送线为研究对象,对基于Plant Simulation的生产线仿真分析与优化方法进行了研究。首先,根据底盘装配输送线的工作原理,利用Plant Simulation软件建立其仿真模型;其次,以装配线实际产能及开动率为评价指标,对某公司规划部门提供的运行参数进行了仿真分析。最后,针对仿真中发现的因预估开动率过高导致实际产能不足的问题,对运行参数进行了优化,仿真结果表明,优化后的运行参数既能够保证规划产能,又能够避免因库存过高导致资源浪费现象。该研究可为新能源汽车生产线的性能分析与优化提供指导,具有较好的工程应用价值。     

基于演化算法的复杂机械广义优化设计实现策略研究

针对复杂机械广义优化设计过程中优化模型不易获得这一难题，利用人工神经网络的高度非线性是非线性映射能力，将优化建模转换为求取设计变量到设计方案的映射关系，构建了复杂机械广义优化柔性建模方法；引入模糊评价理论，设计了基于演化计算的优化方法，给出了优化流程图。该策略特别适用于复杂机械概念设计阶段的方案优化。     

高职《塑料模具设计》课程教学改革探究

结合模具专业课程建设的发展与实践,以实际产品为载体构建教学项目,从优化教学内容、革新教学方法、课程学习效果评价等方面阐述了《塑料模具设计》的理论教学改革与探索。     

薄壁管数控弯曲成形工艺参数区间研究

针对大直径薄壁管件数控弯曲成形工艺,假设管件质量的评价指标参数,即管件的最大壁厚变化率及最大截面畸变率为随机变量,在将该两个相关随机变量转化为独立随机变量的前提下,利用贝叶斯理论分析得到两个独立随机变量的正态分布特性。同时利用基于信噪比的多目标决策理论,得到以最优质量评价指标参数为中心,置信度1-α下的最佳质量评价参数球域。并基于质量评价指标参数与工艺参数的映射关系,通过神经网络映射得到工艺参数的优化区间。最后对Φ50 mm×1.0 mm×100 mm管件进行弯曲成形的实例计算,分析结果证明该方法具有良好的工程实用性和有效性。     

基于模糊综合评判模型的焊接方法选择评价系统

为辅助工程师进行焊接方法选择,在综合考虑焊接质量、焊接成本和焊接效率的基础上,构建了焊接方法综合评价指标体系专家系统.设计了各指标值的采集方法和模糊预测方法,并利用功效分数理论提出了指标的无量纲化途径.最后建立了两种焊接方法优化选择综合评价模型,并根据模型开发制造了焊接方法选择评价专家系统.系统采用浏览器/服务器结构和...     

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。