广西大新锰矿280m平硐掘进机械化作业线的配套方式

简述国内平巷掘进机械化作业线的配套方式和适用条件,介绍了广西大新锰矿280m平硐掘进机械化作业线的配套方式。采用YT-28气腿式凿岩机、LD-120型挖斗式装岩机、8m3的S8型梭式矿车和10 t架线式电机车机械化作业线配套方式取得较好效果。     

Generalized neural network and wavelet transform based approach for fault location estimation of a transmission line

To maintain the efficient and reliable operation of power systems, it is extremely important that the transmission line faults need to be detected and located in a reliable and accurate manner. A number of mathematical and intelligent techniques are available in the literature for estimating the fault location. However, the results are not satisfactory due to the wide variation in operating conditions such as system loading level, fault inception instance, fault resistance and dc offset and harmonics contents in the transient signal of the faulted transmission line. Keeping in view of aforesaid, a new approach based on generalized neural network (GNN) with wavelet transform is presented for fault location estimation. Wavelet transform is used to extract the features of faulty current signals in terms of standard deviation. Obtained features are used as an input to the GNN model for estimating the location of fault in a given transmission systems. Results obtained from GNN model are compared with ANN and well established mathematical models and found more accurate.     

Installation and commissioning of a cryogen distribution system for the TPS project

A cryogen distribution system was installed and commissioned to transfer liquid nitrogen (LN₂) and liquid helium (LHe) from storage dewars to superconducting radio-frequency (SRF) cavities for the 3-GeV Taiwan Photon Source (TPS) project. The cryogen distribution system comprises one distribution valve box (DVB), four control valve boxes (CVB) and seven sections of multichannel transfer line (MCL). The DVB distributes the LHe and LN₂ to the CVB, and then to the SRF cavities through independent vacuum-jacketed transfer lines. The vaporized GHe and GN₂ from the cryomodules are collected via the MCL. The cryogen distribution system was installed and commissioned from October 2014 to the end of March 2015. This paper presents the installation, pre-commissioning and commissioning of the cryogen distribution system, and describes the heat load test. Thermal acoustic oscillation (TAO) was found in the GHe process line; this phenomenon and its solution are also presented and discussed.     

Modular product platform configuration and co-planning of assembly lines using assembly and disassembly

Formation of products platforms is carried out during the planning stage and very often separately from the planning of corresponding assembly lines. There is a dearth of literature which considers the different aspects of fully integrating platform design, product family formation, assembly line design, delayed product differentiation, and new concepts of mass customization. A Modular Product Platform Configuration model which uses assembly and disassembly for configuring product variants and Co-Planning of products platforms (MPCC) and their assembly Lines is presented. It is used to co-plan the common platform components and the associated product families simultaneously with the planning of its corresponding mixed-model assembly line. Using both assembly and disassembly to customize the product family platform in order to generate product variants is not commonly discussed in literature. It is defined as the formation of platforms for use to derive multiple products by including many components not shared by every product. The platform is then customized by assembling or disassembling components to form different product variants. The model is formulated using mixed integer mathematical programming to minimize the number of assembly stations and cycle time. Two case studies are used for verification and demonstration. They illustrated the ability of the MPCC model to integrate the planning of product platform, product families and the number of assembly stations required to assemble and disassemble components from mass-assembled product platforms to derive new product variants.     

双向拉伸聚酯薄膜生产线的技术创新

综述了国内外双向拉伸聚酯薄膜(BOPET)生产线技术水平的差异。并在现有的生产线配套系统上,进行了技术改进和创新,并取得了较好的效果。     

PECSTAR2．1系统在提高铸造企业信息化管理水平中的应用

介绍了铸造二厂工业电炉及自动造型线微机在线电力监控系统的研发及拓展，并介绍了在提升设备管理水平方面的应用。应用表明，该系统为铸造二厂降低动能费用支出、提高自动线开动率发挥了重要作用，已成为管理者的一项重要管理工具。     

Absenteeism as a major cause of bottlenecks in assembly lines

This paper analyses the effects of absenteeism in assembly lines. The analysis shows that assigning temporary workers as substitutes for absentees has a major potential for generating bottlenecks. Such a bottleneck typically appears when an inexperienced worker replaces an absentee worker at their position. The inexperienced worker starts their learning curve, and for the initial period is significantly slower than other stations, and therefore is a bottleneck. The paper analyses the effect of typical absenteeism rates on the throughput, and shows it has strategic magnitude. This is verified using simulation. The effect of the absenteeism and turnover on the throughput is found to be related to the cycle time, and the amount and rate of learning. The paper discusses the simulation results, staffing requirements, strategies for overcoming absenteeism, and future research directions.     

全寿命周期设计理论在输电线路设计中的应用

传统的设计思路已经不再适应现阶段输电线路需要，应给予改进，才能迎合目前输电工程需求。本文就全寿命周期设计理论在输电线路设计中的应用进行分析，以供参考。     

A Pareto biogeography-based optimisation for multi-objective two-sided assembly line sequencing problems with a learning effect

This research presents a Pareto biogeography-based optimisation (BBO) approach to mixed-model sequencing problems on a two-sided assembly line where a learning effect is also taken into consideration. Three objectives which typically conflict with each other are optimised simultaneously comprising minimising the variance of production rate, minimising the total utility work and minimising the total sequence-dependent setup time. In order to enhance the exploration and exploitation capabilities of the algorithm, an adaptive mechanism is embedded into the structure of the original BBO, called the adaptive BBO algorithm (A-BBO). A-BBO monitors a progressive convergence metric in every certain generation and then based on this data it will decide whether to adjust its adaptive parameters to be used in the next certain generations or not. The results demonstrate that A-BBO outperforms all comparative algorithms in terms of solution quality with indifferent solution diversification.     

浅谈上跨营业线双机联合起升架梁施工技术

本文按照双机联合起升架梁施工工艺流程进行了论述，使读者能够清晰掌握现场施工程序。并结合工程实际，提出了相关优化措施，希望对于指导今后类似工程施工能够起到一定借鉴作用，并能为相关工作者提供参考。