齿轮脉冲电化学光整加工控制系统的研究

针对齿轮的脉冲电化学光整加工的实际特点。设计了一套基于上下位机结构的微机控制系统。阐述了工艺的控制原理。介绍了系统的结构组成和软件模块的设计。对步进电机的控制和微机间的通信技术做了重点阐述。该系统改善了光整加工的质量。提高了生产率。适合了大批量生产的需要。     

计数器回零机构

本文简介了回零机构的工作原理。确定了回零凸轮廓线的解析方程及其基本参数。探讨了凸轮的测量方法。分析了凸轮及其推杆的受力并研究了其自锁区。根据不自锁的要求解决了推杆外廓的设计问题。     

制造工程技术与制造科学(一)

发展先进的制造工程技术，需要制造科学的支持。论述了当代制造工程技术的特点。探讨了世纪之交制造业内外正在发生的主要变化。阐述了今日制造工程学科面对的挑战。回顾了制造科学的历史发展。探讨了制造科学的研究现状。介绍了制造科学研究的两项成果。     

适用于中小型链条热水炉的模糊控制

根据实际经验和采集的现场运行数据确定了模糊控制规则,设计了模糊控制器。详细地阐述了该控制器的设计方案和实现方法,针对设计做了详细的分析说明。使用了先进的控制算法实现了锅炉的自动控制。本系统成功用在了工业实际项目中,效果良好。     

轴的可靠性设计CAD方法

本文讨论了轴的可靠性设计CAD 方法。文中提出了轴的疲劳强度可靠性设计CAD 程序的编制原则,并给出了相应的CAD 程序和应用例子。这种可靠性CAD程序简化了计算,节省了时间,提高了设计质量,减少了轴的尺寸。     

PLC在变频恒压热水供应控制系统中的应用

本系统采用FX2N系列PLC设计了一套变频恒压热水供应控制系统。阐述了系统主要的工艺原理。设计了系统流程图。完成了手动档和自动档的程序编制过程。最后设置了报警系统并进行了触摸屏画面制作。试验证明本系统能够达到高效的控制作用。     

超声波金属焊接机气动回路及PLC控制系统的设计

对用于铜箔和铜管连续缝焊的超声波焊接机的气动和控制系统进行了设计分析。根据焊接工艺,拟定了气动回路,进行了气动元件的选择计算,确定了管道直径,验算了压力损失。拟定了PLC控制流程并对控制端口进行了分析,编写了控制程序,实现了铜箔和铜管的自动焊接。     

基于PLC的折弯机自动控制系统的研制

为提高伺服电机的定位精准性,充分利用了PLC作为逻辑控制器可靠性高的特点,设计了一种能够精确控制折弯角度的折弯机控制系统。介绍了折弯机的工作原理,提出了基于PLC、伺服系统、文本显示器的控制系统的解决方案。详细阐述了折弯机的工作流程,给出了硬件接线原理图以及折弯机控制系统的算法。通过一个程序实例,进行了折弯机的自动控制系统的模拟实验。实验结果表明,设计满足了系统的要求。     

MZ208内圆磨床的电气改装

该厂对无锡机床厂1973年生产的MZ208全自动内圆磨床进行了改装。根据使用的具体情况,在控制系统上保留了原机床的手动调整部分和仪表测量全自动部分。以通用的JZ7中间继电器代替了小型继电器,克服了接插和触点接触不良的缺点。用电感测量代替气动测量,解决了积水问题。对机械手采用了强迫下料,保证了上下料的可靠性。取消了原来利用工件的电气联锁,将中频发电机的起动与电主轴的起动分别进行,克服了起动跳闸的缺点。附图2幅。     

空间曲面零件电火花线切割加工新技术

开发了能实现空间曲面工件电火花线切割加工的多轴联动加工系统。阐明了系统的组成及运动规律。通过计算机仿真和加工实践。研究验证了数学模型的正确性。从而拓宽了电火花线切割加工的工艺范围。解决了空间曲面工件的加工难题。     

The actuality and progress of whole sky infrared cloud remote sensing techniques

Clouds are crucial regulators of both weather and climate. Properties such as the amount,type,height,distribution and movement of them have an impact on the earth's radiation budget and the hydrological cycle,thus cloud observation is very important. The disadvantages of zenith pointing measuring instruments and whole sky visible imagers limit the application of them.A summary of the actuality and application of ground-based whole sky infrared cloud measuring instruments and analyses of the techniques of radiometric calibrations,removal of atmospheric emission and calculation of cloud cover,amount,type are conducted to promote the automatically observation of the whole sky. Fully considering whole sky infrared cloud sounding theories,techniques and applications,there are still a lot of studies on improving the properties of instruments,enhancing the techniques of cloud base height measurements and establishing instrumental cloud classification criterion before actual operations.     

Morphological investigations on the lips and cheeks of the goat (Capra hircus): A scanning electron and light microscopic study

The current study was done to provide comprehensive information on the anatomical features of the lips and cheeks of the goat by gross examination and morphometric analysis in addition to scanning electron microscope (SEM). Samples from 12 normal healthy adult goat's heads of both sexes were collected directly after slaughtering. The lips and cheeks were dissected, and specimens were collected for both light and SEM. The lips of goat were soft and mobile. The free border of both lips was characterized rostrally by the presence of labial projections. The number, size, and arrangement of labial projections differed in the upper and lower lips. On the other hand, the buccal papillae were arranged into 6–8 longitudinal rows parallel to the cheek teeth. The length of these papillae decreased caudally while they were absent on the most caudal part of the cheek. Presence of several types and shapes of labial projections and papillae, and buccal papillae suggest a high degree of mechanical adaptation of the lips and cheeks of the goat. This study provides baseline data for clinical studies. This study is the first report to shed light on the morphology of the lips and cheeks of the goat by gross and scanning electron microscopy.     

Pododermal angioarchitecture of the bovine claw in relation to form and function of the papillary body: a scanning electron microscopic study.

The region-specific angioarchitecture of the bovine pododerma was examined using systematic scanning electron microscopy of micro-corrosion casts of juvenile and adult bovine claws. Particular emphasis was laid on the demonstration of specialised vascular structures such as arteriovenous anastomoses. Comparing the results of main and dew claws, respectively, of juvenile and adult claws, a relation between burdening of the claw and density and differentiation of the pododermal papillary and lamellar blood vessels was detected. The results suggest a possible influence of body weight (or age) and weight-bearing on the formation and vascularisation of the pododermal papillary body. The lamellar and papillary microvascularisation and microcirculation are discussed.     

机械设计制造中机电一体化的应用研究

我国的科学技术飞速发展,在社会各个行业领域中均得到了广泛的普及和运用,机械设计制造业中加大了对机电一体化的探索和研究,提高了机械设计制造的整体水平和生产效率。机电一体化直接影响着机械制设计制造的综合水平和最终效率,实现了信息、机械、电子等技术的有机融合。本文对机械设计制造中运用机电一体化的优势进行了探讨,结合机械设计制造中机电一体化技术分析,提出了机械设计制造中机电一体化技术应用研究。     

基于FPGA的FTIR光谱仪采集系统的设计

为了满足人们对于食品药品安全检测快速便携的需要,团队设计一种高速便携,延时低、精度高的新型FTIR光谱仪。光谱采集系统分为上位机和下位机2部分,系统的上位机软件设计是采用跨平台的C++图形用户界面应用程序,该框架(QT Creator)是由编程实现的,下位机的光电部分采用了MEMS微镜使仪器小型化,而下位机采集部分控制主板使用了ZYBO。使用了DAC驱动动镜移动以及ADC用于参考光和样本光数据的同步采集,进而利用多个串口实现了与上位机的完成指令控制以及采集数据传输。低波特率串口用于接收上位机控制指令。2个高波特率串口发送FIFO缓存的光谱数据。经试验验证采集系统的ADC、DAC及UART的时序控制满足了高速高效的需求。但是在便携上可进一步提高,下一步考虑通过利用Linux将上位机部分移植ZYBO内。采集控制设计完全使用了verilog代码进行了仿真与实测,发挥了FPGA的灵活特性,利用例化法提高了采集速率。     

工业机械手运动学仿真

使用Pro/Engineer建立了工业水平多关节机械手3D模型,并使用Adams作为仿真工具,实际分析了机械手的运动学和动力学特征:介绍了机械手设计的过程与方法,取得了优化的3D设计参数,为3D建模与优化提供了一种实际方法.     

基于毛细力的芯片微操作方法研究

提出一种基于毛细力的芯片微操作方法,可实现微芯片的精准拾取、释放以及与尺寸匹配的基底的高精度自对齐。开发可精确模拟液桥形态的双迭代算法,求解微芯片操作过程中的拾取力与释放力,深入研究基于毛细力的微芯片的拾取以及释放的机理以及必要条件。研究液滴体积、基底接触角对微芯片拾取力和释放力的影响。结果表明,拾取力和释放力均随液滴体积的增大而增大,释放力随基底接触角的减小而增大。进一步通过试验验证基于毛细力的芯片微操作方法的可行性,研究液滴体积对微芯片操作的影响,并统计微芯片操作的成功率。基于毛细力的微操作方法在软体机器人、微机电系统、可穿戴设备的集成等领域具有潜在应用。     

HPLC及LC-MS技术在低聚糖检测中的应用

目的介绍HPLC以及LC-MS技术在低聚糖检测中的应用。方法对近十余年国内外发表的具有代表性的相关文章进行分析、整理和归纳。结果 HPLC可通过选用不同的分离模式、结合多种检测方法满足不同性质低聚糖的分离、分析、检测要求;HPLC和MS联用又将极大地提高分离分析效率。结论 HPLC及LC-MS技术具有灵敏度高、选择性好、应用范围广等优点,是目前低聚糖检测分析的主要方法;随着HPLC和LC-MS技术的日臻完善,它们在低聚糖检测分析中的应用将更为广泛。     

TRIZ在林木生物质粉碎机创新设计中的应用

文中系统全面地应用TR IZ理论进行了林木生物质高效精细粉碎机创新设计。在对实际问题分析的基础上,进行了系统功能分析及根本原因分析,通过技术矛盾定义和创新原理应用、物理矛盾定义和分离方法应用、物场模型建立和标准解法应用确定了粉碎机结构创新设计方案。     

Atmospheric effects of friction,friction noise and wear with silicon and diamond. Part I. Test methodology

This multi-part paper series gives evidence of tribothermally catalyzed, lubricative interactions of low partial pressures of hydrogen, water vapor and oxygen with silicon and polycrystalline diamond employed as bearing materials in moving mechanical assemblies (e.g., miniaturized rotors, bearings and gears) of microelectromechanical systems. In part I a test methodology is described, whereby wide environmental range SEM-tribometric friction data are combined with friction noise analysis and applicable literature information to further assist in interpreting atomic-level interactions governing the macroscopic friction and wear behavior of Si and diamond. To further correlate the wear- and thermal desorption-induced generation, re(de)construction and adsorbate-passivated annihilation of dangling σ bonds with high and low adhesion and friction, previously generated average coefficient of friction (COF) values are complemented with the concept of the associated MAX.COF: the highest coefficient of kinetic friction gleaned from the raw computer-logged friction force data of each oscillatory cycle of an experiment. The MAX.COF/COF ratios are used as measures of the friction noise as a function of temperature and atmospheric environment. These quantities, sampled at the appropriate data logging rate to circumvent test machine-related vibrational disturbances, demonstrated signs of friction- and friction noise-reducing gas-phase interactions of dry hydrogen with silicon (part II) and diamond (part III). Future installments will deal with similar lubricative properties of low partial pressures of wet hydrogen and dry oxygen. This revised version was published online in July 2006 with corrections to the Cover Date.