高分辨率星载光学系统装调过程的偏心误差分析

针对影响光学系统成像质量的装调误差,分析了偏心误差对高分辨率光学系统成像的影响。基于一款自主设计的接近衍射极限的高分辨率星载相机光学系统,利用Zemax光学软件分析光学装调过程中偏心误差对光学传递函数的影响,得出光学系统中各个分离元件对成像质量影响的权重,为光学系统的装调方案设计和实施提供了依据,实现了该光学系统2 500万像素高分辨率成像。这种误差分析方法实现了对光学系统装调过程的有效控制,提高了光学装调的效率。     

复合式镗铣加工中心箱体零件原点找正方法

由于箱体零件结构复杂,具有加工批量大和精度要求高的特点,为提高找正效率,提出关于箱体零件原点找正的方法。在研究过程中,以复合式镗铣加工中心为加工平台,构建了箱体零件的在线检测系统。通过数学建模和解析几何的知识,对置于加工中心回转台任意位置的箱体零件进行原点找正,同时确定工件原点坐标和偏转角的大小。此方法经实践检验,适合于复合式镗铣加工中心大批量生产箱体零件,提高了箱体零件加工精度和找正效率。     

单表对中法在多轴机组找正中的研究与应用

介绍了单表对中法的特点,在能源动力厂发电管控中心煤气压缩机安装过程中的应用,着重介绍了单表对中法在多轴系机组调整中的使用方法。     

产品需求类型与供应链设计匹配研究

根据产品柔性需求和数量柔性需求的程度高低界定了稳定性、产品柔性、数量柔性以及产品数量柔性四类不同的需求环境。通过理论以及案例研究发现,稳定性需求、数量柔性需求、产品柔性需求、产品数量柔性需求分别与效率型、数量反应型、创新反应型和定制反应型供应链存在最佳匹配关系。从市场需求、产品种类变动、利润率、顾客驱动因素、市场资格因素、市场制胜因素等方面归纳了四类供应链的不同特点。研究结果为企业根据需求环境设计供应链提供了决策依据。     

装胎机构中螺旋传动的电动抓胎手设计

针对装胎机构中轮胎定位精度不高等问题,分析了螺旋传动原理,全新设计了电动抓胎手;该设计具有较高的定位精度和对中精度,易于实现自动化控制爪子的开合,能够应用于电动装胎机构中。     

The Electro-Optical Effect of LC Cells by the Processing Parameter of PI Alignment Layer

The electro-optic characteristics of Liquid Crystal Displays (LCDs) are deeply affected by those parameters including the kinds of liquid crystals and alignment layer materials, the forming conditions of alignment layer, the substrates alignment mode and the processing conditions of rubbing alignment in the interface treatment. In this study, differential scanning calorimeter (DSC), thermal gravity analysis (TGA) and moisture analyzer are utilized to examine the properties of liquid crystals and PI alignment layer materials. The interface treatment between liquid crystals and PI alignment layers were executed via the alignment technology of unidirectional mechanical rubbing with a rayon velvet cloth. Those LC cell specimens were fabricated using Merck MJ99159 N_P liquid crystal and PI alignment layer material (JSR-AL 21000) with various process conditions. Under those parameters influence of curing, rubbing and alignment direction, cell specimens display various electric-optical effects.     

The dual-edge alignment technique with improved spur reduction effects in ring oscillators

In this paper, the technique of dual-edge phase-alignment and its effects on ring oscillators are presented. This technique provides resetting of the built-up jitter at both rising and falling edges of a clean aligning signal named as the reference. Using signals and systems theory, the effect of the technique on the spurs due to the aligning reference signal is completely analyzed. We show that adding properly the dual-edge aligning feature to phase-aligned ring oscillators cause the spurs in the neighborhood of the carrier to disappear. First, the validity of the results obtained from the derived analytical equations is verified through simulations using MATLAB. Then a complete circuit considering realistic models for its components is simulated in TSMC RF CMOS 0.18um process using ADS for further validation.