智能表库物流系统设计——以内江电业局计量中心为例

介绍了一种智能表库物流系统的设计方法,并列举了一个实例.应用最小二乘法进行需求分析与预测;紧接着优化作业流程,应用SLP方法进行功能区的布局设计;继而通过对托盘立体库和周转箱立体库的设施设备选型等对仓库进行了详细设计;最后进行经济性评价.     

自动化仓库模块化单元式货架的优化设计

提出一种模块化单元式货架自动化仓库。根据仓储空间损失最小的原则,建立了货架的数学模型,对结构进行了优化,并与普通单元式货架进行了比较分析。用此仓库频繁存储不同种类、不同大小的货物,能更有效提高空间利用率和存储灵活性。     

Performance evaluation of manufacturing systems based on dependability management indicators—case study: chemical industry

Dependability is a key decision factor in today’s global business environment affecting product cost and process. Dependability reflects user confidence in fitness for use by attaining satisfaction in product performance capability, delivery, service availability upon demand, and minimizing cost. The main objective of this study is to develop an integrated approach for evaluation of manufacturing systems based on dependability indicators for conducting a better dependability management system (DMS) through integration of the principal component analysis (PCA) and the data envelopment analysis (DEA). To achieve the objective of this study, an industrial sector—chemicals and chemical products in Iran—is selected as the case of this study in accordance with the International Standard for Industrial Classification of all economic activities (ISIC). Firstly, we define dependability indicators, for both inputs and outputs, based on IEC 60300. Due to the extra amount of indicators, we utilize a hierarchical structure to cluster the indicators for an easier analysis. Secondly, for reducing the number of some variables, we apply pair-wise comparison to assign weights and to unify the related sub-criteria to one main criterion. Finally, an integrated DEA–PCA approach is employed to assess the most and the least dependable units and to find critical indicators in macro and micro levels in order to make policy for implementation of DMS in manufacturing systems.     

自动化立体仓库控制系统设计与实现

本文介绍的自动化立体仓库控制系统采用由一台工业控制计算机和3台PLC怕集散型控制网络,实现了集监控、调度、诊断、货位分配、堆垛机运行参数给定等功能于一体的自动化立体仓库控制系统和堆垛机制系统以及立体仓库数据库管理系统。工业现场运行证明了这种设计、控制思路的先进性。     

定制设计AS/RS系统组合式货架方法研究

通过分析AS/RS系统的组合式货架的结构特点建立了组合式货架产品结构模型,结合定制设计技术方法开发了一种可以支持定制化配置组合式货架三维图像系统,实现组合式货架从上至下的变型设计。实验运行表明,系统能够高效、可靠地响应货架变型设计过程中配置数据调整,支持AS/RS组合式货架产品的定制设计工作。     

基于Goldstein模型的员工培训绩效分析

绩效分析是绩效模型的第一步,Goldstein模型是最广泛采用的模型.采用现存数据分析、需求分析和知识工作分析三种方法,讨论某机械公司的培训需求,总结Goldstein模型的缺点和局限性,并寻求改进方法.采用Goldstein模型进行绩效分析时发现,组织分析时忽略了组织环境的分析,没有重视员工自身的情感需求和精神需求,...     

Evaluation and dynamic allocation of AS/RS control rules: A simulation study

The goal of this research is to investigate the performance of an automated storage and retrieval system (AS/RS) which is operated using different control rules. Two phases of study are conducted. Phase 1 evaluates the efficiency of different rules for stacker control, storage-location assignment and job sequencing. Phase 2 studies the impact of these rules on the performance of the AS/RS using a multipass simulation approach. In this paper, the methodology of investigation is discussed, the results are presented and analysed, and suggestions for future study are made.     

Performance evaluation of an innovative design modification of an orifice meter

This paper evaluates the effect of innovative design modification on the performance of an orifice meter. The orifice meter of 10 mm plate thickness is considered as reference meter and the plate has been modified by changing the surface topology to curvature on both the sides of the orifice plate and the performance has been evaluated using CFD. The performance of the meter is evaluated in terms of coefficient of discharge (C_d) and standard deviation. The study reveals very interesting phenomenon. The newly designed orifice meter has higher discharge coefficient with an improvement of about 22% compared to the reference orifice meter with β-value of 0.6. The performance of the new orifice meter with β-value of 0.6 and radius of curvature of 7.07 mm (2R/d = 0.471) is nearly independent of Reynolds number over the entire range of flow conditions studied (10³ ≤ Re ≤ 10⁶).     

数字化装配环境下产品装配设计方案模糊评价

分析了产品装配设计与规划活动所涉及到的产品设计(装配设计)、制造(装配工艺)、服务(装配维修)和环境(无污染、易回收)等环节的特点,在此基础上利用数字化装配环境,从动态装配过程和静态装配环境两个方面对影响装配的众多因素进行分析和归类,建立了产品装配质量、时间、成本、维修、环境影响模型,给出了各评价指标隶属函数和权重的确定方法,利用模糊层次分析法对产品装配设计方案进行了综合评价.应用表明,该方法能为优选装配设计方案和改进设计提供决策支持.     

Uncertainty evaluation of multivariate quantities: A case study on electrical impedance

The paper discusses the evaluation of the uncertainty of a multivariate quantity using the Law of Propagation of Uncertainty defined in the Guide to the Expression of Uncertainty in Measurement (GUM) and a Monte Carlo method according to the GUM’s Supplement 2. The quantity analysed is the electrical impedance, which is not a scalar but a complex quantity. The used measuring method allows the evaluation of the impedance and of its uncertainty in different ways and the corresponding results are presented, compared and discussed. For comparison purposes, results of the impedance uncertainty obtained using the NIST Uncertainty Machine are also presented.     

齿轮箱减速器设计方案模糊评价方法的研究

机械产品设计方案拟定阶段是产品创新设计的关键,通常可以产生多个可行的设计方案.在设计方案的评价过程中,需要建立准确的评价模型.由于在设计方案设计阶段,存在很多的模糊性以及不确定性,因此传统的评价方法很难做出准确的评价.为此,提出模糊AHP方法,并将其应用于齿轮箱减速器设计方案的评价中,结果证明是有效的.     

Thermal AFM: a thermopile case study

In this work, an atomic force microscope (AFM) with an integrated thermal sensor has been used to obtain the local spatial distribution of temperatures in a micromachined thermopile with submicron resolution. In this communication, we will show how the dimensional, structural and functional characteristics of a thermopile suits well with the requirements for AFM thermal imaging, and how a deeper insight of the thermopile operation can be gained with the aid of these advanced scanning probe-based tools.     

Numerical analysis of installation effects in Coriolis flowmeters: A case study of a short straight tube full-bore design

A fully coupled, partitioned, numerical model that accounts for fluid–structure interaction is applied for a study of installation effects in a straight-tube Coriolis flowmeter. Three flow disturbance elements positioned at different locations upstream of the measuring tube are considered in the study: a single elbow, closely coupled double elbows out-of-plane, and an orifice. The installation effects are estimated by comparing the mass-flow sensitivities obtained for the disturbed and the fully developed flow conditions in the measuring tube. The interpretation of the installation effects is given by analysing the anti-symmetric fluid forces in the measuring tube. The simulation results show that the magnitude of the installation effect in asymmetrically distorted flows varies for the different circumferential positions of the motion sensors. The sensitivity variations around the circumference of the measuring tube are less pronounced for measuring tubes with a higher circumferential stiffness.The predicted installation effects are also affected by changing the vibration direction of the tube with respect to the disturbance elements.     

OPC技术在小型立体仓库监控管理系统上的应用

介绍了利用S7-200PCAccess作为OPC服务器实现了S7-200PLC同时和以WinCC为OPC客户端的监控软件、以VB为客户端的上位库存管理软件之间的通讯实现方法。     

A case study in the design of flexible assembly systems

The design of production systems is generally based on economic considerations, which are related to certain technical criteria, such as capacity, availability, and reliability. To realize a cost-effective design, these technical and economic criteria should be considered in their mutual coherence during the conceptual design process. This paper focuses on a productivity model, which is related to this subject. This model allows an opinion to be formed about the technical and economic performance of conceptual robotic assembly cells, during the process of design. First, the system design process is discussed in brief, after which the productivity variables are presented. An illustration of the model is used to assess the technical and economic behavior of alternative system structures for the assembly of a power plug assortment.     

Thermal deformation of a semi-automatic machine: a case study

Higher speeds and accuracy in machine tools and increasing compactness in design, which tends to decrease the heat dissipation from the machine tool to the surroundings, make it necessary to investigate thermal influences which invariably lead to changes in the alignment accuracy of the machine tool. A semi-automatic chucking machine with a built-in hydraulic system was used to study temperature and deformation of the headstock     

基于Pro/ENGINEER多目标设计研究的优化设计

分析了Pro/ENGINEER多目标设计研究功能与原理,并介绍了其过滤法则。通过实例,详细地叙述了多目标设计研究的具体实施过程,得出了优化模型。通过原始模型和优化模型的比较,证明多目标设计研究能较好地对相互冲突的多个设计目标进行优化。