Dynamisches Handling im Vakuum

Dynamic handling in vacuum The usage of dynamic systems in vacuum requires unusual solutions. To ensure a long durability the selection of materials and components and just as much their design have to be done very carefully. Often the drive has to be inside the chamber. In etching processes the repeatability of dynamic motions is of prime importance, in coating processes the accuracy it is. Rotary feedthroughs mostly are not applicable. The particle emission und the outgassing of used materials and components inside the chamber should be well noticed and attended. Clever constructions, experience and knowledge perform developement and production of modular systems.     

圆锥体测量与数据处理

针对圆锥体轴线和顶角的检测问题 ,提出了一种通过测量锥体表面点来间接计算结果的方法。描述了采样规则 ,介绍了数据处理过程 ,并给出程序框图。该方法具有一定实用价值     

Handling high specific activity tritium

The Chalk River Nuclear Laboratories' (CRNL) Tritium Laboratory was designed and built to develop techniques and methods for the safe handling and storage of pure tritium (T₂). The laboratory currently handles up to 20 000 Ci (0.74 PBq). The laboratory, its components and equipment selected for use with tritium, the monitoring system, and health and safety procedures are described. The design and operation of uranium and titanium beds, used for tritium transfer and storage, are also discussed.     

Handling constraints using multiobjective optimization concepts

In this paper, we propose a new constraint‐handling technique for evolutionary algorithms which we call inverted‐shrinkable PAES (IS‐PAES). This approach combines the use of multiobjective optimization concepts with a mechanism that focuses the search effort onto specific areas of the feasible region by shrinking the constrained search space. IS‐PAES also uses an adaptive grid to store the solutions found, but has a more efficient memory‐management scheme than its ancestor (the Pareto archived evolution strategy for multiobjective optimization). The proposed approach is validated using several examples taken from the standard evolutionary and engineering optimization literature. Comparisons are provided with respect to the stochastic ranking method (one of the most competitive constraint‐handling approaches used with evolutionary algorithms currently available) and with respect to other four multiobjective‐based constraint‐handling techniques. Copyright© 2004 John Wiley & Sons, Ltd.     

Handling hostile environments at a stroke

Premature seal failure in reciprocating pumps present users with both operational and maintenance problems. In general, standard elastomers in the plunger packing fail due to frictional heat and abrasion generated by the mechanical movement of the plunger. In this article Fred Pipper of Utex Industries, describes the development and testing of a new nitrile-based elastomer system for sealing reciprocating pumps, which possesses high wear and anti-abrasion properties.     

换热站噪音处理

文章分析换热站噪音来源,介绍噪音处理的方法.     

工作流系统的异常处理

工作流执行时可能存在多种潜在的工作流异常,对这些异常进行预测并及时处理已经成为当前学者和软件开发商密切关注的课题。本文介绍了工作流系统的异常处理问题,综述了国内外的研究现状,明确了异常处理的概念和相关处理方法,并基于对现有研究方法的分析与评价,指出了工作流异常处理研究的发展方向。     

采场爆破质量事故处理实践

在地下采矿的中深孔爆破中,出现多起铵油炸药拒爆的质量事故,通过事故分析和模拟实验,找出了可能产生事故的多种原因,并采取相应技术和管理措施,达到了满意的效果,为同类采场爆破事故处理提供借鉴。     

Automatic Data Handling of Film Records

This paper discusses ways of automatically retrieving brightness data from photographic emulsions and processing them in an electronic computer. Consideration is given to the correction of the errors inherent in photographic systems and it is pointed out that if this correction is sufficiently comprehensive the way is open to the much fuller exploitation of the potential of such systems.     

Data Handling and Recording by Laser

This article introduces the second group of contributions to the special issue of Optica Acta on ‘Optics at Philips in Hamburg’. These papers deal with opto-electronic interfaces for sequential and parallel modulation, optical interaction with matter for remanent and reversible storage along with concepts and designs of opto-electronic systems, highlighting physical and technological progress required to marry optical techniques with present-day system objectives.     

A Material Handling System Selection Model

A technique is presented which can be used to design, or assist in the design of, an integrated materials handling system for a manufacturing facility or a major department of the facility. The developed procedure selects the materials handling equipment to be used to perform a given set of moves in order to miriimize the system's costs associated with the handling, assuming the plant arrangement remains fixed. To demonstrate the selection procedure, an example problem is presented. Since the method is heuristic, no claim of optimality is made.     

A Generalized Materials Handling Simulation System

Materials handling systems have been found to follow a general model, consisting of moves and equipment required to execute these moves. The model is described and some results of its application are discussed. The use of the model enables an engineer or manager to simulate his own materials handling system quickly and easily, and test proposed changes.     

新型单轨悬挂搬运系统设计

目的满足现代物流仓储搬运的自动化需求与空间利用最大化的要求。方法借助三维软件建立系统模型,合理设计该系统的布置与基本结构,包括搬运功能区的布置与流程、总体结构方案的设计、升降机构的设计与牵引车的设计。利用Solid Works软件对新型机构和牵引车的运行速度进行仿真分析。结果新型升降机构升降高度和牵引车的运行速度满足设计要求,达到了预期的设计目的。结论该系统可以实现快速、高效搬运,能够满足制造业和配送中心对空间利用率的要求。     

Preparing Students for Careers in Material Handling

This report summarizes the proceedings of a roundtable discussion of materials handling educational issues by a panel consisting of practitioners in the materials handling industry. The objective of the discussion was to: (i) understand how practitioners apply their engineering expertise to industrial problems, (ii) identify critical skills and attributes required of practicing materials handling engineers, and (iii) determine how ties between universities and the practicing community could be strengthened to prepare material handling students for successful careers in the material handling industry. The discussion was centered around five issues related to the above objectives. The panel felt that a vast majority of the materials handling problems faced by practitioners fall in the operational analysis category. Simulation modeling, group problem solving, project management and simple operational analysis based on fundamental mechanical and electrical engineering principles appear to be the primary analytic methods used for problem solving. Graduating engineers entering the materials handling field must possess strong communication, interpersonal and analytical skills, be able to organize and lead a project successfully, and exhibit a high degree of creativity. Because the role of a materials handling engineer will often be that of an internal consultant, they must be able to lead and work effectively in multi‐disciplinary teams. Increased automation on the shop‐floor and globalization of the business world demand that the engineer have a strong multi‐disciplinary background. Materials handling students in the nation's universities must be familiar with various equipment types including their functionality, applications, strengths and weaknesses, have a firm grasp of the analytical and simulation based problem solving tools, and be able to take the “big picture,” systems approach in problem solving. Classroom instruction must include project and case based learning and coverage of theoretical topics. While the former is important for students to be able to solve practical problems, the latter is valuable for imparting analytical skills and creativity. Increased collaboration between the industry and universities will help prepare successful materials handling engineers.     

欠驱动搬运机器人轨迹跟踪控制

目的为了解决欠驱动搬运机器人的中心和质心不重合的轨迹跟踪问题。方法建立非完整性约束的欠驱动机器人的运动学和动力学的模型,基于反步法控制策略生成新的虚拟反馈量,设计跟踪控制器,同时,利用自适应技术对具有不确定跟踪控制器的参数进行校正,通过Lyapunov理论验证控制器的稳定性。结果仿真实验结果表明,欠驱动搬运机器人的实际轨迹可以快速地跟踪期望轨迹,验证了基于反步法设计的跟踪控制器的可行性和有效性。结论设计的控制器能够使搬运移动机器人达到良好的轨迹跟踪效果,并且保证了控制器的自适应性。