Scheduling of jobs and maintenance in a textile company

In this paper we consider a periodic maintenance scheduling problem in a textile company. In our research, a periodic maintenance schedule consists of several maintenance periods and each maintenance period is scheduled after a periodic time interval. The purpose of this paper is to find a schedule that minimizes the maximum tardiness subject to periodic maintenance and nonresumable jobs. An efficient heuristic is developed to provide the near optimal schedule for the problem. A branch-and-bound algorithm is also proposed to find the optimal schedule. Some important theorems associated with the problem are implemented in the algorithm. Computational results show that the proposed heuristic is highly accurate and efficient.     

动态联盟公司异地生产计划调度与控制系统的研究

针对复杂任务问题的求解，提出了一种基于敏捷企业间组成的动态联盟公司的运行模式，并给出了一种异地生产计划调度与控制系统的结构模式。详细讨论了分布式生产调度的协同控制方法。     

金属橡胶成型工艺研究及其应用

主要研究了金属橡胶的成型工艺,介绍了金属橡胶材料在工业中的应用.     

金属橡胶成型工艺研究及其应用

金属橡胶是一种具有广阔应用前景的新型材料,这里主要对金属橡胶的成型工艺进行了研究,并介绍了金属橡胶材料在工业中的应用。     

锥形橡胶减振器静特性的分析研究

从理论上对橡胶减振器的静态特性,特别是静刚度进行了分析研究,得出了锥形橡胶减振器静刚度的计算公式,并把该公式用于北京型内燃机车的减振系统,得到了比较满意的结果。     

基于多调度约束的人机协同调度工具的研究与实现

针对以往生产调度研究中未涉及配作约束的情况，在对实际生产调度过程中考虑的各种调度约束进行抽象和分类的基础上，建立了基于多调度约束的调度数学模型，并给出了3个关键算法依据这些算法开发的调度工具较好地解决了精密零件生产中含有配作约束的车间调度问题。     

基于一种改进遗传算法的ERP车间调度研究

ERP系统已成为我国企业管理的一个有效工具，然而目前所有的ERP系统还不完善，其中关于JSP问题则是一个一直没有得到很好解决的难点。正是在深入研究这一问题之后，首先建立一种更加适应企业实际应用的JSP模型，在此基础上对遗传算法做出相应改进，增加对该模型的适应度，并且用该改进算法来解决ERP系统的JSP问题。最后结合具体案例在VB环境下实现该算法软件设计，初步实现ERP软件中的JSP功能，增强ERP系统的完善性。     

Tribological and vibroacoustic behavior of a contact between rubber and glass (application to wiper blade)

The wiping of the windshield of a car is carried out with the reciprocating motion of a rubber blade on glass that removes the water from glass. This function is realized by a contact dimension between the rubber and glass of a few tens of micrometers. A good wiping is characterized by a homogeneous disposal of the water, without noise generation and by limiting as much as possible the phenomenon of wear (loss of wiping or noise presence). This wiping is only possible by a good understanding of the tribological, mechanical and vibroacoustic parameters that control completely the contact. Our article proposes to approach four typical phenomena occurring on rubber wiper blades. Also, we will describe the evolution of dry friction coefficient with temperature. Later, we will approach the influence of velocity on the friction coefficient of a wiper rubber blade by water. Then we will talk about a phenomenon called tacky friction where the friction coefficient reaches a very important value. And in conclusion, we try to give a relationship between the stick–slip and the squeal noise.     

ANSYS二次开发及其在起重机轮叉设计中的应用

参数化设计语言(APDL)和用户界面设计语言(UIDL)是大型有限元分析软件ANSYS为用户二次开发提供的实用工具。这里探讨了用UIDL添加用户菜单和用户命令,调用APDL程序,来自动进行有限元结构分析的方法,并对起重机轮叉设计进行了实际的开发研究。     

制造系统动态监测与调控技术研究

为了提高制造系统的可控性和运行效率，需要及时掌握其运行状态信息，并以此为依据采取相应的措施。通过对车间控制系统现状的研究，提出一种基于智能反馈的制造系统动态监测与调控方法，采用一定的算法高效地监测制造系统的运行状态，并针对出现的不确定性因素进行系统的重组织。最后。通过实例分析了该方法的工作流程。     

Scheduling of Flexible-Sequenced Process Plans in a Mould Manufacturing Shop

Process planning and scheduling used to be two very separate processes. However, owing to the recognition of the intricate relationship between them, recent work has focused on integrating the two processes. The use of flexible process plans in scheduling allows more flexibility in production and thus gives substantial cost savings. It also increases the solution space of the optimisation problem and makes it more critical to have an effective optimisation algorithm than for traditional scheduling problems. This paper describes a process-planning and scheduling system that makes use of the branch and bound approach to optimise priority weighted earliness of jobs scheduled in a mould manufacturing shop. Instead of consideing a flexible manufacturing system, this paper focuses on the demands of less integrated factories, which are especially typical of mould manufacturing shops. The layout of the system, the methodology of the algorithm and effectiveness of performance measures for real industrial use are discussed in the paper.     

车间批量生产调度及基于OpenGL的仿真研究

针对作业车间批量生产的调度及仿真问题,根据等分批原则,建立分批调度的数学模型,之后把分好的子批看成一个新的工件,对其重新进行编号并计算新的加工时间,利用遗传算法良好的全局搜索性能和禁忌搜索算法优良的局部搜索性能,引入混合优化算法进行生产调度;然后利用OpenGL建立生产车间以及加工设备的三维模型,并赋予场景初始化、设备初始化功能和视点移动、模型整体变换功能;最后利用分批调度计算得出的最终结果,根据工件中每个工序的开始加工时间和加工消耗时间,设置触发器和定时器,并通过读取相应的加工设备编号确定加工的位置坐标,进行实时地调度仿真。     

钢铁生产智能调度系统模型重构的研究

为了满足钢铁企业实时的动态调度需求,分析了钢铁调度模型特点及规律,提出模块化的处理方式对钢铁调度模型进行划分,并提出基于集合的方法解决了钢铁调度模型单一、针对性弱的问题。重点研究了模型与集合的映射关系以及模型的重构算法,并给出了模型重构算法流程图,以实现多个模型的交、并、差运算,从而构建综合多个模型优势的新模型,满足钢铁生产智能调度的需要,避免了重复建模。最后通过两个钢铁热轧调度模型重构实例说明了模型重构的可行性。     

考虑预压量的橡胶减振件刚度特性及其对动力学性能影响

采用yeoh本构模型拟合应力-应变曲线,对橡胶节点预压量与径向及轴向刚度的关系进行了研究,并分析了刚度对动力学性能的影响.结果表明,适量的预压量既能有效满足橡胶节点各向刚度要求,又能调整橡胶节点的动力学性能,为机车车辆橡胶件的研究提供依据.     

Effect of rubber on tribological behaviors of polyamide 66 under dry and water lubricated sliding

The friction and wear behaviors of polyamide 66 (PA 66) and rubber-filled PA 66 (PA 66/SEBS-g-MA) composites were investigated on a block-on-wheel model friction and wear tester under dry sliding and water lubricating conditions. In order to further understand the wear mechanisms, the worn surfaces and scraps of samples were analyzed by scanning electron microscopy (SEM) and differential scanning calorimeter (DSC). The experimental results indicated that the wear mass loss and the friction coefficient of PA 66 decreased with the addition of rubber particles. The friction coefficients of PA 66 and PA 66/SEBS-g-MA composites under water lubricating condition are lower than those under dry sliding condition, but the wear mass losses are higher than those under dry sliding condition. The main wear mechanisms under dry sliding condition are the plastic deformation and mechanical microploughing. Whereas the main wear mechanisms under water lubricating condition are the mechanical microploughing and abrasive wear.     

基于80C196单片机的橡胶硫化仪的研制

利用80C196单片机研制了一种低成本、全自动化橡胶硫化仪。该仪器采用单片机驱动24针打印机和彩色波晶屏，实现了整机自动控制，大大提高了整机的性能价格比，在橡胶加工工业中具有较大的实用价值。     

单件生产系统中动态车间作业计划与监控系统的集成研究

对于动态多变的单件生产系统来说，车间作业计划是最有效的生产管理措施之一；在编制这类生产系统的车间作业计划时，与监控系统有效集成又是必须考虑的最关键的问题。为此研究了单件生产系统中车间作业计划与监控系统的集成问题，又提出了集成的总体结构，基于这一结构，叉提出了日程作业计划的3种确定方法，较详细地分析了在进行车间作业计划滚动编制时，对各种监控反馈信息的处理措施。     

Effects of carbon black on the fatigue life,critical J-value and fracture morphology and a new estimated equation for natural rubber

This study investigated the fatigue lives and mechanical properties of the carbon black filled natural rubber for the vibration-proof parts of the railway vehicle and automobile. The carbon blacks were one of the sources of crack nucleation and crack propagation in the rubber matrix, like the cementite and the maganese sulfide in iron matrix. Different kinds of carbon blacks resulted in different fatigue lives, critical J-values, and fracture morphologies. It was noticed that the critical J-value remained almost the same regardless of the length of a pre-crack. In addition, different kinds of carbon blacks generated different fracture morphologies, and microscopic and macroscopic roughnesses. The critical J-value has linear relations to the roughness, and it seemed related to the size distribution of carbon black particles. By reviewing all the experimental data, we found the factors that were related to the fatigue lives, and the logarithmic value of the fatigue life could be linearly expressed by the combination of the critical J-value and the macroscopic roughness. We also proposed a new estimative equation of fatigue life.     

A study on mechanical and tribological properties of silicone rubber reinforced with white carbon black

This paper analysed the effect of different white carbon black (fumed silica and precipitated silica) on the mechanics and friction property of silicone rubber. The tensile strength, tearing strength, elongation rate and shore hardness of silicone rubber reinforced with different kinds or dosages of white carbon black were investigated in detail. The wear morphology, worn surface analysis and chemical compositions of the rubber sample after the friction test were analysed by means of scanning electron microscopy, three-dimensional profile metre and energy dispersive spectrometer, respectively. Results showed that the mechanics properties of silicone rubber were obviously enhanced with the increase in white carbon black content. Moreover, after the friction test, the vulcanised rubber reinforced with fumed silica has less wear surface protrusions and grinding than that of precipitated silica. The wear rubber filled with fumed silica surface is quite smooth and shows few furrows and grooves, which well corresponds to good anti-wear ability of the reinforcing fillers. In the course of practical application, it is necessary to take into account of the mechanical properties, wear resistance of rubber and the adding amount of filler to achieve the optimum coordination for the best mechanical and friction properties of silicone rubber.     

基于Web的复合材料车间生产计划调度信息系统构建

阐述国内航空企业复合材料制件车间生产计划与调度模型以及存在问题,提出在.net框架下,运用WebServices技术,基于B/S结构对生产计划调度信息系统进行开发.系统运行在国内某航空企业复合材科车间,在实际应用中大大提高了企业生产计划编制和调度的效率,促进了车间管理的信息化发展.