CAPP系统与SmarTeam集成技术的研究

从CAPP系统的现状出发 ,分析了当前CAPP系统的问题 ,提出了面向PDM的集成化CAPP系统的思想。针对SmarTeam这一PDM软件给出了系统的体系结构 ,随后对CAPP系统和SmarTeam系统的集成技术进行了研究 ,探讨了CAPP系统与SmarTeam系统集成的关键技术     

基于VS的船用潜液泵监测系统研究

船用潜液泵系统广泛应用于各种液货船上,为了提高潜液泵系统运行的稳定性,降低其故障率减少损失,提出了一种基于VS平台开发的潜液泵监测系统。分析了监测系统所需的数据,介绍了整个系统组成架构,并给出了系统的实现方法。该系统的使用方便了实时掌握潜液泵系统的运行状态,且能及时地给予故障预警,同时也为潜液泵系统检修提供了指导。     

一种超高压纯水射流船舶除锈系统设计方案研究

设计了船舶除锈超高压水射除锈系统,给出了系统的基本参数配置,泵组系统的工作原理,论述了泵组系统的基本组成,探讨了真空吸干回收系统基本功能,研制了爬壁机器人的实验样机.采用超高压纯水射除锈系统进行了综合除锈实验,试验结果表明:选用的除锈系统参数配置合理,超高压水射流除锈成套系统搭建方案可行.     

试析机电一体化技术在汽车制动系统中的应用

阐述了BBW系统的组成,对传统液压制动系统以及BBW制动系统进行了比较,并对BBW制动系统的关键技术进行了分析,同时介绍了ABS系统在汽车制动系统中的应用情况。     

液压系统的改造设计研究

对冷床上卸钢系统和四辊轧机开卷机液压系统存在的问题进行了分析,找出了产生问题的原因,并对原液压系统进行了改造,经改造后的系统,减少了油液的泄漏,提高了系统的稳定性,减小了维修强度,降低了维修成本,提高了系统的工作效率.     

基于AR模型的磁流变减振系统动态性能研究

研制了磁流变减振器及测试系统,建立了系统的动力学自回归AR模型。通过连续系统传递函数与离散系统的时间序列AR模型的对应关系推导出了三阶系统动态响应性能参数计算公式,分析了系统的减振性能和系统的动态响应,得到了系统的最优工况。     

机械式离心调速器系统混沌的非线性反馈反控制

根据拉格朗日方程建立了机械式离心调速器系统的动力学方程,求出了系统的平衡点,利用系统的相图分析了给定参数下自治系统及非自治系统的运动状态,用Poincaré映射图分析了非自治系统混沌的形成过程。利用非线性反馈反控制方法实现了自治系统及非自治系统混沌的反控制,将自治系统及非自治系统的周期运动利用适当的控制强度反控制到混沌运动轨道。     

煤矿装车系统的优化研究

研究设计了一种新型的装车系统,首先分析目前几种装车系统的优缺点,并提出一种新的方案,介绍了系统的组成部分与工艺流程。对装车系统的给煤系统与装载系统这两个分系统进行了设计选型,其中包括皮带机的设计与液压系统的设计等。对系统最终的应用效果显示,对比其他装车系统,该系统显著提高了装车速度,减少了运输车辆等待时间。     

对机械设计及其发展的系统学研究

以系统学观点对设计系统进行了描述,提出了设计系统具有分层系统结构,由设计过程系统、设计工具系统及产品物质系统等,构成从产品物质系统到产品技术系统的非线性映照,并建立了系统模型,进而在该模型的基础上,对机械设计各分系统及其发展进行了探讨。     

采煤机液压系统部件磨损分析及磨损状态监测系统设计

分析了采煤机液压系统关键部件磨损机理,构建了采煤机液压系统关键部件磨损状态监测系统,结合采煤机液压系统关键部件磨损状态监测系统在晋华宫煤矿的应用实例,探讨了采煤机液压系统关键部件磨损状态监测系统应用的效益。     

Mice embryology: A microscopic overview

In this work, we studied the embryology of mice of 12, 14, and 18 days of gestation by gross observation, light microscopy, and scanning electron microscopy. Grossly, the embryos of 12 days were observed in C‐shaped region of the brain, eye pigmentation of the retina, first, second, and third pharyngeal arches gill pit nasal region on the fourth ventricle brain, cervical curvature, heart, liver, limb bud thoracic, spinal cord, tail, umbilical cord, and place of the mesonephric ridge. Microscopically, the liver, cardiovascular system and spinal cord were observed. In the embryo of 14 days, we observed structures that make up the liver and heart. At 18 days of gestation fetuses, it was noted the presence of eyes, mouth, and nose in the cephalic region, chest and pelvic region with the presence of well‐developed limbs, umbilical cord, and placenta. Scanning electron microscopy in 18 days of gestation fetuses evidenced head, eyes closed eyelids, nose, vibrissae, forelimb, heart, lung, kidney, liver, small bowel, diaphragm, and part of the spine. The results obtained in this work describe the internal and external morphology of mice, provided by an integration of techniques and review of the morphological knowledge of the embryonic development of this species, as this animal is of great importance to scientific studies. Microsc. Res. Tech. 2012. © 2012 Wiley Periodicals, Inc.     

聚焦型微通道内气泡生成特性数值模拟

微气泡因具有比表面积小和稳定性好等特点被广泛应用于污水处理和矿物浮选等领域。为了高效获得稳定的微气泡,利用COMSOL软件研究了聚焦型微通道中气、液相流速、表面张力、液相黏度和壁面润湿性对气泡生成的影响。结果表明：当气相流速增加时,气相克服表面张力的能力增强,气泡的脱离尺寸和频率增大,脱离时间减小;液相流速增加时作用在微气泡上的惯性力和剪切力增大,气泡脱离时间和脱离尺寸均减小;表面张力增大时气泡脱离时间和脱离尺寸增大,脱离频率减小;液相黏度增大时,作用于气泡的黏性力随之增大,气泡的脱离时间和脱离直径均随之减小,脱离频率增大;接触角从40°增大到180°,气泡的脱离尺寸和脱离时间整体先增大后减小,脱离频率先减小后增大。     

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.     

大尺度构件重载高精加工机器人本体设计与性能提升关键技术

基于典型大尺度构件的移动机器人化加工需求背景与发展现状的总结与分析,提出了大工作空间、高刚度、高精度、重载、轻量化、高动态响应、大负载自重比的大尺度构件加工机器人本体的基本性能要求。围绕上述基本性能要求,从机器人本体构型与机构优化设计,高性能加工机器人专用控制器与加工机器人操作系统开发,加工机器人运动学参数动态标定及位姿误差实时预测与动态补偿,刚柔耦合多体动力学建模,机器人动力学控制及主动振动控制等方面,论证了重载高精度加工机器人本体的优化设计及机器人性能提升方法,并完成了大尺度构件加工机器人本体构型与机构的概念设计。大尺度构件加工机器人本体的创新设计与研制,可为航空航天等领域的典型大尺度构件提供高性能的超柔性机器人化加工系统,并有助于推动国产工业机器人关键性能的提升。     

微波滤波器的装调融合建模与反演

微波滤波器作为关键的选频装置,在设计制造周期中存在一些突出问题,如设计制造周期数据割裂以及数据缺乏有效利用,从而导致设计制造阶段脱节,降低了设计制造迭代效率。文中提出了一种微波滤波器装调融合建模与反演方法,根据滤波器的设计信息、制造数据以及滤波器机理采用自顶向下的方式构建滤波器知识图谱,利用知识图谱对微波滤波器的数据与机理进行规范化存储;利用机理数据融合建模的方法构建微波滤波器正向演进模型;基于正向演进模型,结合渐进空间映射算法,构建微波滤波器快速装调反演模型。演进与反演实验结果表明,预测电性能与实际电性能基本重合,故障滤波器通过两次装调即可满足设计指标。该方法能够实现微波滤波器设计制造数据的有效关联、微波滤波器性能演进的有效预测以及快速装调反演,提高了设计制造周期数据的利用率,增强了滤波器设计与制造的协同。     

XPN-FMS: A CAD tool for FMS modeling, analysis, animation, and simulation using Petri nets and X window

We propose a CAD tool, XPN-FMS, which is primarily based on a unique Petri net (PN) synthesis method, called the knitting technique, developed by the authors. Petri net theory has been applied to specification, validation, performance analysis, control code generation, and simulation for manufacturing systems. The analysis of flexible manufacturing systems (FMSs) based on PNs suffers from the complexity problem of reachability analysis (Peterson, 1981). CAD tools are urgently needed. There is no existing CAD tool for FMSs as comprehensive as XPN-FMS, in the sense that the latter integrates the functions of drawing, analysis, reduction (Chao and Wang, 1992; Murata and Koh, 1980), synthesis, property queries, and animation of FMS operations in one software package. Using the X window graphical interface and animation, XPN-FMS makes the modeling and analysis of an FMS visualizable and easy to understand and manipulate. It lets a user draw the factory layout of an FMS on the screen of a monitor using the supplied tools. A corresponding PN model can also be drawn on the monitor screen. XPN-FMS can animate and simulate the overall operating process of the FMS. It is useful for FMS specification, validation, and exploration of different design alternatives, status monitoring, and control. Using XPN-FMS with various inputs and comparing the resulting outputs, the user can determine how to improve efficiency, reduce cost, and pinpoint bottlenecks. For the PN models of FMSs that are decision free, we extend the theory and algorithm of a unique matrix-based method (Chao and Wang, 1993b) to search for subcritical loops (including types A and B) and to support scheduling and dealing with transition periods. XPN-FMS implements this extended method to find the minimum cycle time, critical loop, subcritical loops, next critical loop, and scheduling ranges to avoid the transient period for static scheduling. This is implemented in XPN-FMS for the input sequence control.This project is partially funded by NJIT's Separately Budgeted Research Program. Portions of this article were presented in Chao, Chen, Wang, and Zhou (1992),Proceedings of the 1992 IEEE International Conference on Systems, Man, and Cybernetics, Chicago, Illinois, October 1992. The former name of the first author, which has appeared in some of his earlier publications, was Yuh Yaw.     

一种新型弱耦合三平移并联机器人机构及其运动学分析

提出一种弱耦合2RRPaR+PPaP三平移操作机器人机构,分析了机构的自由度及拓扑结构特征;推导了机构的正逆解方程以及速度、加速度模型,根据速度雅可比矩阵,分析了机构的奇异位置;根据机构的逆解方程和主要约束,采用三维极坐标边界搜索法绘制了机构的工作空间三维实体图和截面图;由ADAMS三维模型仿真和运动正解方程计算所得的位移、速度、加速度曲线基本一致,验证了运动方程的正确性。该机构解耦性好、结构简单、运动灵活,在纵向移动方向上具有部分解耦和工作空间大的优点,适合用作生产线自动操作手机构。     

Contribution of high-resolution correlative imaging techniques in the study of the liver sieve in three-dimensions

Correlative microscopy has become increasingly important for the analysis of the structure, function, and dynamics of cells. This is largely due to the result of recent advances in light-, probe-, laser- and various electron microscopy techniques that facilitate three-dimensional studies. Furthermore, the improved understanding in the past decade of imaging cell compartments in the third dimension has resulted largely from the availability of powerful computers, fast high-resolution CCD cameras, specifically developed imaging analysis software, and various probes designed for labeling living and or fixed cells. In this paper, we review different correlative high-resolution imaging methodologies and how these microscopy techniques facilitated the accumulation of new insights in the morpho-functional and structural organization of the hepatic sieve. Various aspects of hepatic endothelial fenestrae regarding their structure, origin, dynamics, and formation will be explored throughout this paper by comparing the results of confocal laser scanning-, correlative fluorescence and scanning electron-, atomic force-, and whole-mount electron microscopy. Furthermore, the recent advances of vitrifying cells with the vitrobot in combination with the glove box for the preparation of cells for cryo-electron microscopic investigation will be discussed. Finally, the first transmission electron tomography data of the liver sieve in three-dimensions are presented. The obtained data unambiguously show the involvement of special domains in the de novo formation and disappearance of hepatic fenestrae, and focuses future research into the (supra)molecular structure of the fenestrae-forming center, defenestration center and fenestrae-, and sieve plate cytoskeleton ring by using advanced cryo-electron tomography.     

Histochemical and ultrahistochemical localization of heavy metals in calf organs

Cadmium, zinc, selenium, and copper were administered, singly or in combination, orally or subcutaneously. Experiment I included 32 calves of both sexes; six received Cd (two groups), Zn, Cd, and Zn, and Cd and Se (two groups) and one group was a control. In Experiment II (21 bulls), three were given Cd, Cd, and Cu, and Cd and Zn, respectively, and one group was a control. For light microscopy, in Experiment I the highest amounts of silver granules were present in the samples of liver, small intestine, and vesicular gland of all the exposed groups; in Experiment II the most affected organs were liver, kidney, and small intestine. For electron microscopy, in Experiment I, after administration of Cd and Zn, the highest amounts of granules were seen in the cytoplasm of hepatocytes and cells of the proximal and distal renal tubules and the lowest amounts were found in glandular cells of the pancreas. Administration of Cd and Se resulted in the presence of large numbers of granules in the nuclei and nucleoli of spermatogonies. In Experiment II, ingestion of Cd and Zn in feed led to the appearance of highest amounts of granules in the nucleoli, nuclei, and cytoplasm of cells in testes, kidneys, and pancreas. Following Cd intake, the highest accumulation of granules was observed in the nucleoli of hepatocytes and cells of the proximal and distal renal tubules. Combined Cd and Cu produced the highest number of granules in cells of the proximal and distal renal tubules and in the nucleoli and nuclei of germinal epithelium.     

振动子结构综合与修正方法研究综述

在大型复杂的结构设计过程中,子结构综合与修正方法由于其快速、动态、综合等特点越来越广泛地应用于现代结构设计之中,以完善子结构综合与修正方法知识参考、引起国内学者关注该技术研究为目的,阐述了振动子结构与系统之间的综合与修正方法。在子结构综合方法中,主要对比分析了模态缩减与综合、频域JETMUNDSEN、REN、机械阻抗导纳法综合法、频响函数奇异值分解降噪法、子系统转角自由度刚柔等效及转换方法的原理及应用,评述了上述方法的优点与不足,就尚未解决的问题作了进一步探讨;在子结构修正方法中,对比分析了多重参考基准修正法、目标函数动态修正法、参数型修正、神经网络型修正、灵敏度修正、频响函数修正等方法的应用,总结了模型修正方法中存在的一些问题。最后,提出了振动子结构综合及修正方法的研究趋势。