基于并行式绿色设计的包装机械开发模式探讨

针对传统串行式开环包装机械的设计模式所存在的产品生命周期各环节相互独立、顺序作业、缺乏必要、及时的信息交流和反馈、开发周期长的问题,提出了包装机械开发中应用并行式闭环绿色设计方法,对于优化包装机械设计、缩短开发周期、提高质量、降低成本,以及增强包装机械寿命周期全过程的"绿色度"均有着极其重要的现实意义.     

浅谈包装工程专业及学生的双向培养

本文阐述了开设包装工程专业的必要性及该专业的特点,强调了为适应社会需要现阶段对学生从两个方向培养,详细叙述了两个方向学生学习的侧重点及课程的倾向性.     

“包装容器结构设计与制造”课程教学改革的探讨

分析了"包装容器结构设计与制造"课程的特点,指出了传统教学过程中存在的问题,并结合郑州大学课程教学改革实际,从教学内容、教学方法与手段、实践教学和考核方式等方面提出了"包装容器结构设计与制造"课程教学改革的几点建议,旨在提高学生的综合能力。     

Hydrodynamics performance and tray efficiency analysis of the novel vertical spray packing tray

Column setup has been widely utilized in the petroleum and chemistry industries. However, with the fast progress of industries and the increasingly serious energy shortage, designing a new column setup with better performance and higher capacity becomes more urgent. In order to improve column's capacity and expand operating condition, a new type of column tray named novel vertical spray packing (NVSP) tray was designed and experimented. The performances of the novel tray, including pressure drop, weeping, entrainment and tray efficiency, were tested in a plexiglass column. In addition, performances of the novel tray were compared with that of the sieve tray and the Glitsch V1 valve tray. Based on the experiment data, the mathematical correlations of pressure drop, weeping and entrainment for the novel tray were established by regression analysis method. A fundamental model of dry pressure drop of the novel tray was promoted at the form of sum mode. The results indicate that the novel tray has wider operating condition and better performance.     

A Stochastic Pocket Model for Aluminum Agglomeration in Solid Propellants

A new model is derived to estimate the size and fraction of aluminum agglomerates at the surface of a burning propellant. The basic idea relies on well‐known pocket models in which aluminum is supposed to aggregate and melt within pocket volumes imposed by largest oxidizer particles. The proposed model essentially relaxes simple assumptions of previous pocket models on propellant structure by accounting for an actual microstructure obtained by packing. The use of statistical tools from stochastic geometry enables to determine a statistical pocket size volume and hence agglomerate diameter and agglomeration fraction. Application to several AP/Al propellants gives encouraging results that are shown to be superior to former pocket models.     

Optimal layout design of a satellite module

Layout design of a satellite module directly concerns its structure, performance, service life, and cost of assembly and maintenance. It is an important and NP-complete problem. The main difficulties consist of combinatorial optimizations in mathematics and system complexity in engineering practice, and relevant researches are far from enough. This paper proposes a basic solution strategy for the optimal layout design of a satellite module, which consists of two stages, global (or loose) layout design and detailed layout design. Corresponding algorithms are then developed while taking the layout design of an international commercial communication satellite as an example. They are the centripetal balancing method for global layout design and a quasi Traveling Salesman Problem (TSP) model-based Ant Colony Optimization (ACO) algorithm for layout optimization. The proposed method demonstrates its feasibility and validity on an application instance. Existing problems and further research directions are finally discussed.     

挤封填充堵漏技术在山074-61井的应用

山074-61井位于长庆南梁西区油田,该区块地层存在裂缝发育,失返性井漏时有发生.该井在钻至华池组地层时发生失返性漏失,在采取3次桥塞挤封堵漏和2次填充堵漏后,最终堵漏成功.介绍了堵漏过程并对其进行了分析.该井堵漏的成功对于今后在该区域施工井的井漏处理有一定的借鉴作用.     

减少海外EPC项目现场紧急采购的对策

研究海外EPC项目现场施工过程中发生的因设备材料与原设计赊购不符而产生的现场紧急采购,并提出了减少这种紧急采购量的方法。通过自身执行项目的经验,分析了海外EPC项目采购流程中的几个重要环节,包括请购文件的准备、生产厂家选择、设备材料的制造以及施工现场的材料管理,从而找出导致最终交付施工的设备材料与原设计不符的主要原因,并根据这些原因,提出了可以应用在将来的EPC项目管理中的解决方案。     

Experimental study on the packing of uniform spheres under three-dimensional vibration

Densification of mono-sized sphere packings under three-dimensional (3D) vibration is experimentally studied. The effects of an operational condition, such as vibration amplitude and frequency and feeding method, on packing density are systematically investigated. The results indicate that the dense packings can be achieved by proper control of both vibration amplitude and frequency. The feeding method plays an important role in densification. Higher packing densities can be obtained when the number of particles fed per batch is less than one layer. Packing density decreases with increasing number of particles fed per batch, but keeps constant when the number of particles per batch is larger than three layers. Through the extrapolation on packing density obtained from different sized containers, the maximum packing density is 0.69 for the total feeding method and 0.74 for the batch-wise feeding under the present experimental condition. The formation of ordered structure is discussed based on the particle interlayer diffusion.     

基于MOLDFLOW保压曲线优化设计在托盘中的应用

以学校食堂用塑料托盘为例,用MOLDFLOW软件模拟制件在模腔内流动与保压过程,由于制件尺寸大而薄,在生产中很易由于保压不均匀而导致制件各部位体收缩不一致,从而产生严重的翘曲变形,通过对保压曲线的优化,得到了最佳的保压曲线,很大程度上减小了制件的翘曲变形量.对减小翘曲变形的保压曲线优化给予了原则上的说明,同时也说明了影响翘曲变形的各个因素之问的相互联系.