基于参数化特征建模的信息集成系统—FVCAD

本系统在自行开发的二维参数化绘图系统ＶＣＡＤ基础上，建立一个三维特征征库，在零件的二维设计过程中采取以零件的方位面为单元建立机械零件的特征模型，实现ＣＡＤ／ＣＡＰＰ／ＣＡＭ的信息集成。     

基于二维工程CAD图形的加工特征识别

ＣＡＰＰ系统中零件信息获取的最直接方法是从ＣＡＤ数据中进行特征识别。本文研究了基于二维工程图表达的ＣＡＤ数据的制造特征提取方法，提出基于二维表达的特征信息进行形状识别；研究了二维表达的信息特征，基于用户提取匹配的方法进行制造特征的综合，提出了特征的模板定义结构。     

双平板剪切干涉仪及其干涉图的数值分析

一种用于光学器件及光学成像系统波面象差及像质检验的横向剪切干涉仪及其干涉图的数值分析方法.在平行平板横向剪切干涉原理的基础上,分析讨论了改进后的双平板剪切干涉仪的工作方式及优越性.在对其干涉图的数值分析方面,利用Zernike圆正交多项式作为基底函数,对被测光学系统的剪切干涉图进行波面的二维最小二乘拟合,以期重构原始波面,得到被测光学系统的波面象差函数,进而求得系统的光学传递函数(OTF).对一组标准镜头进行的测试分析表明测量的不确定度＜0.05.     

双平板剪切干涉仪及其干涉图的数值分析

一种用于光学器件及光学成像系统波面差及像质检验的横向剪切干涉仪及其干涉图的数值分析方法,在平行平板横向剪切干涉原理的基础上,分析讨论了改进后的双剪切干涉仪的工作方式及优越性,在对其干涉图的数值分析方法,利用Ｚernike圆正交多项式作为基底函数,对被测光学系统的剪切干涉图进行波面的二维最小二乘拟合,以期重构原始波面,得到被测光学系统的波面差函数,进而不得系统的光学传递函数（ＯＴＦ）,对一组标准镜头进行的测试分析表测量的不确定度＜０．０５。     

电站锅炉炉膛温度分布测量仪的研制

本阐述了在恶劣的工业生产环境对温场分布监测时采用成象光谱法的理由；创造性地将成象光谱、数字图像处理方法和面阵ＣＣＤ成象技术有机地结合在一起，通过合理的装置设计，研制出全炉膛火焰温度场分布监测装置；在对黑体的标定中得到预期结果，并在现场测量中满意的结果。     

炭布铺层2D炭/炭复合材料研究

采用预浸炭布铺层制作炭／酚醛树脂基层合板,后经炭化、致密制备了二维炭／炭复合材料（２Ｄ－Ｃ／Ｃ）,检测了其工艺过程中的尺寸变化,测试了力学、导热、热膨胀、高等离子烧蚀性能。结果表明,２Ｄ－Ｃ／Ｃ在工艺过程中Ｚ向有明显的收缩现象,炭化收缩率达６．９９％,石墨化收缩率达５．５５％。２Ｄ－Ｃ／Ｃ的层间剪切强度（ＩＬＳＳ）大于１２．６ＭＰａ,拉伸强度大于１３３．７ＭＰａ,位伸模量大于５８．６ＧＰａ,压缩强     

CDF计算程序的可靠性分析

就自编圆柱分布函数ＣＤＦ９２型计算程序的可靠性进行了分析，并以聚酯ＰＥＴ取向非晶薄膜的二维相干散射强度为例进行具体计算，指出了获得可靠的ＣＤＦ应具备的判断依据。     

CCD细分技术用于刻线的自动瞄准

用面阵ＣＣＤ对刻线进行二维瞄准定位，具有精度高，速度快的优点，本文介绍了亚象素细分定位的原理，瞄准精度的测量方法，以及所能达到的精度。     

新型二维电容位置传感器

新型二维电容位置传感器ＭＨｗ。Ｂｏｎｓｅ等１．前盲目前，人们对二维（ＺＤ）位置测量越来越感兴趣。尤其是在ＩＣ生产、生物医学和各种显微技术领域中。迄今，基本的线性位置测量系统主要基于光栅或激光干涉方法，用这些系统可以达到此目的。这些系统在一些应用中也存...     

三维CAD系统的使用—但是怎样使用？通用三维工具或行业专用方法

迄今为止，三维ＣＡＤ系统在机械制造行业中的小型企业中用得很少。作者一方面分析了该现象的原因，另一方面又指出了使三ＣＡＤ系统比二维ＣＡＤ系统如何在实际工作中更实现本质合理化，除了适用于行业的方法外，企业专用的方法也很重要。用户能够通过示教借助于有效的工具，如三维参数化、组合规则，以及技术独立开发这些方法。     

蠕墨铸铁焊接温度场、应力场研究

以高温应变片和热电偶为敏感元件，对蠕墨铸铁材料焊接过程中的温度场、应力场进行了测试，分析了焊接电流、焊接速度对温度场、应力场的影响规律，提出了减小焊接应力的基本方法。     

空调器送风参数对房间速度场和温度影响的计算模拟和试验研究

本文对天花板嵌入式空调器工作的房间,建立了空气流动的三维紊流数学模型,对不同送风参数下的流场和温度场做了计算.并对计算结果进行分析,总结出送风参数对空调房间的气流流动与温度分布的影响规律.又搭建试验台,对不同送风参数下空调房间的温度场和速度场进行试验研究.用小尺度实体模型试验的方法,首次把PIV新技术运用到空调房间流场的测量上.测试结果与计算结果吻合较好,验证了建立的数字模型的正确性,也验证了PIV技术可以运用到大空间的流场测量上.最后利用气流理论对嵌入式空调器不同送风参数下的房间温度场和流场进行了评价.     

高压蒸汽灭菌器的温度分布

高压蒸汽灭菌做为目前重要的灭菌技术广泛用于各行各业,但是灭菌温场的分布鲜有报道。为了明确温场对灭菌效果的影响,参照国标的技术指标对灭菌过程的温场均匀性和温度波动性作了初步研究。以德国ebro生产的无线温度数据存储器为测温设备,在总结大量实验数据的基础上分析出影响温场的几个重要因素:装载量、残余冷汽团、温度控制器、温度探头位置,并对其影响温场的原理做了通俗易懂的阐述,且结合实际使用情况给出建议。     

A study of the heat parameters during bidirectional solidification

The temperature field and heat parameters are important in controlling metal liquid crystallinity in unidirectional and bidirectional solidification. The temperature field can be divided into three cases: a liquid temperature field; solid temperature field; and a temperature field on the solid-liquid (S–L) interface. Heat parameters can be divided into two cases: technical heat parameters; and solidification heat parameters. The temperature field on the S–L interface and solidification heat parameters are the most important for the structures and properties of materials. The temperature field on the S–L interface is determined by the alloy system, and solidification heat parameters are related to the temperature ield of the environment and technical heat parameters. The temperature ield on the S–L interface is closely related to the solidiication heat parameters.

A theoretical model describing precisely the temperature field on the S–L interface during bidirectional solidification was proposed. A series of heat parameters, including temperature gradients G, solidification rate R, cooling velocity V and characteristic temperature T_c have been derived from this model. A superalloy has been chosen as the experimental object in order to verify the theoretical model. The theoretical calculations are found to be in agreement with the experimental results.     

Numerical approximations for a phase field dendritic crystal growth model based on the invariant energy quadratization approach

We present two accurate and efficient numerical schemes for a phase field dendritic crystal growth model, which is derived from the variation of a free‐energy functional, consisting of a temperature dependent bulk potential and a conformational entropy with a gradient‐dependent anisotropic coefficient. We introduce a novel Invariant Energy Quadratization approach to transform the free‐energy functional into a quadratic form by introducing new variables to substitute the nonlinear transformations. Based on the reformulated equivalent governing system, we develop a first and a second order semi‐discretized scheme in time for the system, in which all nonlinear terms are treated semi‐explicitly. The resulting semi‐discretized equations consist of a linear elliptic equation system at each time step, where the coefficient matrix operator is positive definite and thus, the semi‐discrete system can be solved efficiently. We further prove that the proposed schemes are unconditionally energy stable. Convergence test together with 2D and 3D numerical simulations for dendritic crystal growth are presented after the semi‐discrete schemes are fully discretized in space using the finite difference method to demonstrate the stability and the accuracy of the proposed schemes. Copyright © 2016 John Wiley & Sons, Ltd.     

Study on the temperature measurement of AZ31B magnesium alloy in gas tungsten arc welding

This paper is based on the Finite Element Analysis (FEA) to study the AZ31B Magnesium Alloy welding temperature filed, using a convenient, non-contact and fast response measured temperature method—Infrared Radiation (IR), the welding temperature field of AZ31B magnesium alloy plate in Gas Tungsten Arc Welding (GTAW) is measured by IR, the isothermal map of magnesium alloy plate is measured using IR device. The cooling curves are measured by thermocouple. Experiments and simulations by FEA are carried out to investigate the welding temperature field. The simulated results showed good agreement with the experiment ones.     

Effective Increase of Crystal Area during Sublimation Growth of 6H-SiC by Using the Cone-shaped Baffle

A novel design of crucible is proposed in this paper for the growth of SiC crystals. The relation between grown crystal shape and temperature distribution in a growth chamber was discussed. It is pointed out that the crystal shape had a close relationship with temperature distribution. The calculations suggested that the radial temperature field of the growing crystal became homogenous by setting up the cone-shaped baffle in the growth chamber. By modifying the crucible design and temperature distribution in the growth chamber, it is possible to enhance the enlargement of crystal, and also possible to keep grown surface flat.     

用于温度场研究的光折变全息干涉计量术

用光折变晶体光折变效应,不需显影、定影等复杂处理,就能实现实时观测,文章讲座了光折变全息干涉法在光学检测中的应用,提出实时监测火焰温度场的新技术,介绍了有关的实验参数和实验条件及实验过程,最后得出了火焰温度场分布情况。     

星型阴极的温度分布研究

通过对星型阴极的稳定导热问题进行分析 ,推导出阴极交叉点附近温度分布的近似解析式。并用有限差分数值计算方法对钨基底金属的温度分布进行了计算、分析。数值计算结果和解析结果在常用的阴极温度使用范围内吻合良好 ,表明该解析式在热、热 场、Schottky发射阴极的研究和实际应用中具有实用价值     

Determination of surface heat-transfer coefficients of steel cylinder with phase transformation during gas quenching with high pressures

In numerical simulation of quenching process, the boundary conditions of temperature field and stress field are very important, in which the boundary conditions of temperature field are very complicated. In order to simulate the thermal strains, thermal stresses, residual stresses and microstructure of the steel during gas quenching by means of the numerical method, it is necessary to obtain an accurate boundary condition of temperature field. The surface heat-transfer coefficient is a key parameter. The explicit finite difference method, non-linear estimate method and the experimental relation between temperature and time during quenching have been used to solve the inverse problem of heat conduction. The relationships between surface temperature and surface heat-transfer coefficient of cylinder have been given. The non-linear surface heat-transfer coefficients include the coupled effects between phase transformation and temperature. In calculation, physical properties were treated as the function of temperature and volume fraction of constituent. The results obtained have been shown that this technique can determine effectual the surface heat-transfer coefficients during gas quenching.