数字化制造技术在ARJ21飞机导管研制中的应用

介绍国内外飞机导管数字化制造技术的情况,针对新支线飞机ARJ21的研制需求并结合实际生产情况,提出了飞机导管数字化制造技术应用方案,并在新支线飞机机头及铰链臂零件成形制造中进行实施,用数字量的CATIA模型代替传统的标准实样,实现了产品设计、仿真优化、成形制造、检验全过程的数字化信息传递,生产的导管件全部合格交付,满足了装配要求,效果显著.     

基于知识关联的产品装配参数化建模设计方法研究

概述了参数化设计的特点,分析了面向装配的参数化设计中的数据关联关系与自顶向下参数化建模,进一步研究了基于知识驱动的产品装配设计以及CATIA参数化建模功能与知识工程模块,最后结合典型的汽车覆盖件门板冲模模架实例,探讨了基于CATIA平台与CAA二次开发的三维装配体参数化设计与BOM表生成的工程实现方法。     

面向装配的回转体零件砂型低压铸造模具和工装的并行设计

阐述了面向装配的并行设计思想及其在基于UG平台的低压铸造铸模工装CAD系统的实现方法 ,并对变形设计和相关性设计方法进行了研究。应用本系统 ,易于保证工装各部分的关联性 ,有效地防止了装配中可能出现的冲突问题 ,提高了设计效率。     

面向装配设计的标准件库的研究与开发

在对标准件库技术现状分析的基础上，针对装配设计的特点，开发了面向装配的标准件库CAD系统。介绍了系统的总体框架，并重点论述标准件在装配设计中关联技术的实现方法。     

基于CATIA的注塑模具连续装配的研究与开发

通过研究注塑模架及配套零件的装配特点,借鉴参数化设计思想,提出了模具参数化装配方案。基于CATIA平台及已有的模具零件库,利用CAA(Component Application Architecture)二次开发技术,实现了注塑模具连续装配功能,将离散的设计装配过程串联起来,有效地提高了模具整体设计效率。     

面向TOP-DOWN设计的轿车模具装配模型

介绍了面向TOP—DOWN的设计思想，模具TOP-DOWN设计过程，提供了在计算机中表达和存储装配件组成部件之间相互关系的方法，使得通过对装配件之间的相互位置关系的描述能进行仿真和干涉检查，从而解决装配的一致性问题。     

铸造中面向制造的设计技术

介绍面向制造的设计技术及其在铸造中的研究和应用情况，通过将面向制造设计DFM评价准则引入产品设计阶段，从可铸造性和经济性角度评价设计，可以及早地避免不合理设计，达到提高产品设计品质，降低成本和缩短生产周期的目的。     

基于SolidWorks的自顶向下装配体设计及运动仿真

指出了传统的自底向上装配体设计的缺点，并提出自顶向下装配体设计与运动仿真相结合的产品设计方法。以曲柄滑块机构为例，介绍了在SolidWorks平台上自顶向下装配体设计与运动仿真相结合进行产品开发的过程。结果表明，两种技术的融合，不但能够提高设计效率，还可以增强产品的竞争力。     

并行工程下铸件的可制造性设计初探

综述了并行工程中面向制造的设计技术及其在铸造中的研究和应用情况。在并行设计过程中 ,通过产品设计早期阶段引入面向制造设计的DFM评价准则 ,从可铸造性和经济性角度评价设计 ,及时提供设计指导 ,改进不合理设计从而达到提高产品设计质量、降低成本和缩短生产周期的目的     

回转体零件低压铸造模具工装CAD的研究

采用面向装配、相关设计和并行设计的思想，实现了基于UG的回转体零件低压铸模工装CAD系统。该系统可以有效防止装配中可能出现的冲突，提高设计质量和设计效率。     

Unification of the deterministic and statistical approaches for predicting localized corrosion damage. I. Theoretical foundation

In this paper, we provide an alternative, more general theoretical basis for damage function analysis (DFA), by drawing an analogy between the growth of a pit and the movement of a particle. In contrast to our previous formulation of DFA, which was developed specifically for enabling the damage function for localized corrosion to be calculated from the point defect model for passivity breakdown, the coupled environment pitting model for pit growth, and the theory of prompt and delayed repassivation, the new formulation readily incorporates any theories or models (deterministic or empirical) for these stages in the development of a pit. We show that the new formulation leads to the original expressions for the damage functions for active (living) and passivated (dead) pits, and hence for the differential and integral damage functions, as were obtained from the original theory. We also describe the unification of deterministic (damage function analysis, DFA) and empirical, statistical (extreme value statistics, EVS) methods for predicting the development of localized corrosion damage on metal surfaces. In particular, we have devised a means of estimating the central and scale parameters of EVS directly from DFA in a “first principles” manner, as well as from fitting the EVS distribution function to experimental data for short times, in order to predict the extreme value distributions at longer times. The techniques have been evaluated on EVS data for the pitting of manganese steel in CO₂-acidified seawater and for the pitting of aluminum in tap water. Finally, we outline the generalization of pit nucleation, as described by the point defect model, for external conditions that depend on time.     

Using detrended fluctuation analysis to monitor chattering in cutter tool machines

This paper considers accelerometer signals in order to detect chatter instabilities under different spindle speed and depth of cut ratio conditions. Detrended fluctuation analysis (DFA), adapted for time–frequency domain, was used to monitor the evolution of cutter tool dynamics. The DFA offers the advantage over traditional spectral analysis that can be deal with nonstationary, nonlinear data and, in contrast to wavelet approaches, its application does not rely on the selection of basis functions. The underlying idea behind the application is to use the Hurst exponent, an index of the signal fractal roughness, to detect dominance of unstable oscillatory components in the complex, presumably stochastic, dynamics of machine acceleration. Several experiments with a lab-scale cutting machine were performed to illustrate the ability of the DFA to detect unstable cutting behavior. The results, presented in time–frequency domain, show that instabilities are detected in a certain frequency range as the Hurst exponent decreases to reflect anti-persistency of the chatter dynamics.     

连铸结晶器冷却水道设计思路

通过分析不同情况下冷却水流速、压力等各种因素对冷却过程所产生的影响，认为对结晶器冷却水道进行优化设计的关键在于准确掌握水道内冷却水流场，对于各种具体生产情况，可通过调整结晶器的外形结构及几何参数来控制冷却水流场，达到提高生产效率及铸坯质量的效果，进而提出了连铸结晶器冷却水道的总体设计思路。     

Analysis of delayed luminescence from some quenchers of Tb(DPA)3 emission: proof for an energy transfer quenching mechanism

The long-lived luminescence from Tb(DPA)³⁻₃ (DPA=pyridine-2,6-dicarboxylate dianion) can be quenched by Rhodamine 6G, Rhodamine B, some urobilin derivatives and Ru(phen)²⁺₃ (phen=1,10-phenanthroline). Using time-resolved emission spectroscopy we have studied these reactions. The observation of delayed luminescence from the quenchers constitutes direct evidence that electronic energy transfer is involved in the quenching process. Quantitative analysis of the delayed fluorescence and of the lanthanide emission, in conjunction with measurement of the luminescence quantum yield of Tb(DPA)³⁻₃ (φ=0.7±0.15), shows that the production of the electronically excited quencher state in the quenching process occurs with nearly unit efficiency for all the quenchers studied. Additional experimental evidence is provided for the view that energy transfer takes place in encounter pairs where donor and acceptor are in close contact.     

基于作业成本法的模具成本核算

阐述了作业成本法的基本思想和原理,分析了模具的价格构成,总结了模具生产的一般过程.划分出模具设计与制造过程的作业中心及各项作业,确定了作业成本库和成本动因.研究表明,模具企业运用作业成本法可以降低模具的成本,从而降低企业在市场竞争中的风险,最终增强模具企业在市场的核心竞争力.     

酸性溶液中有机胺和氯离子对铁缓蚀的协同作用

利用弱极化曲线拟合方法相交流阻抗测量技术研究了Cl~-对于癸胺(DA)、二戊胺(DPA)和十二烷基胺(DDA)对铁缓蚀作用的影响,并用原子吸收光谱溶液分析技术验证了测量结果。实验表明,在酸性介质中,有机胺和Cl~-在对铁的缓蚀作用上存在着协同效应。缓蚀作用和协同效应的大小与有机胺的种类和溶液中氯离子的浓度有关。有机胺对铁腐蚀电化学行为的影响也由于溶液中Cl~-的存在而发生明显的改变,     

CNTA-16剪扳机的液压系统分析研究

本文对CNTA－16剪板机液压系统的工作原理进行了分析研究，找出该机在回路中采用的四个关键技术。这些回路的设计方法对相关设备的系统设计是具有借鉴价值的，指出合理且完善的回路设计对提高整个机器设备的性能有着不容忽视的作用。     

Spiro[fluorene-7,9′-benzofluorene] host and dopant materials for blue light-emitting electroluminescence device

New spiro-type 5-biphenyl-spiro[fluorene-7,9′-benzofluorene] (BH-1BP) and 5-diphenyl amine-spiro[fluorene-7,9′-benzofluorene] (BH-1DPA) were synthesized for use as blue organic light-emitting host and dopant materials, respectively. Their optical properties, including their UV absorption, photoluminescence and energy levels, were measured and blue OLEDs were made from them. The structure of the blue device is ITO/DNTPD/α-NPD/BH-1BP:5% dopant/Alq₃ or ET4/Al–LiF. Here, α-NPD is used as the hole transport layer, DNTPD as the hole injection layer, BH-1DPA or diphenyl-[4-(2-[1,1;4,1]terphenyl-4-yl-vinyl)-phenyl]-amine (BD-1) as the blue dopant materials, Alq₃ or ET4 as the transporting layer and Al as the cathode. The blue devices doped with 5% BH-1DPA and BD-1 show blue EL emissions at 444–448 nm at 7 V. A high efficiency of 3.28 cd/A and the CIE coordinates (0.14, 0.11) at 7 V can be achieved from the devices composed of BH-1BP:5% BD-1/ET4.     

基于PLC的柴油机挺柱孔专机的控制系统

介绍了柴油机挺柱孔专机的加工过程和设计思路，给出了系统控制设计的接线图和PLC的设计框图，最后提出了柴油机挺柱孔专机改造的新设想。     

制造企业工业现场远程监控系统的设计与开发

在分析现有远程监控实现方式的基础上,结合中德政府合作项目面向上海大众汽车有限公司的具体应用,提出了一种新型的制造企业工业现场远程监控系统实现思想,同时介绍了系统实现的关键技术。