Engineering knowledge formalization and proposition for informatics development towards a CAD-integrated DfX system for product design

Target design methodologies (DfX) were developed to cope with specific engineering design issues such as cost-effectiveness, manufacturability, assemblability, maintainability, among others. However, DfX methodologies are undergoing the lack of real integration with 3D CAD systems. Their principles are currently applied downstream of the 3D modelling by following the well-known rules available from the literature and engineers’ know-how (tacit internal knowledge).This paper provides a method to formalize complex DfX engineering knowledge into explicit knowledge that can be reused for Advanced Engineering Informatics to aid designers and engineers in developing mechanical products. This research work wants to define a general method (ontology) able to couple DfX design guidelines (engineering knowledge) with geometrical product features of a product 3D model (engineering parametric data). A common layer for all DfX methods (horizontal) and dedicated layers for each DfX method (vertical) allow creating the suitable ontology for the systematic collection of the DfX rules considering each target. Moreover, the proposed framework is the first step for developing (future work) a software tool to assist engineers and designers during product development (3D CAD modelling).A design for assembly (DfA) case study shows how to collect assembly rules in the given framework. It demonstrates the applicability of the CAD-integrated DfX system in the mechanical design of a jig-crane. Several benefits are recognized: (i) systematic collection of DfA rules for informatics development, (ii) identification of assembly issues in the product development process, and (iii) reduction of effort and time during the design review.     

Optimal operating conditions to maximize the net power of polymer electrolyte membrane fuel cells: The stack-system interface of a commercial 18 kW module

A new, experimental method based on air flow rate rather than current is presented to optimize operating parameters for the stacks and systems of proton exchange membrane fuel cells (PEMFCs) for maximizing their net power. This approach is illustrated for a commercial 18 kW PEMFC module. The impact of contamination pressure drop across the cathode air filter is also investigated on the compressor behavior. It is further shown that a 4V reduction in the compressor voltage reduces its power consumption by 9.1%. Using the 3D graphs of the power-pressure-flow data, it is found that the stack pressure of 180 kPaa is superior to the higher tested pressures as it enhances the net power by 7.0 and 13.7% at different conditions. Application of the present study will lead to the development of PEMFCs with higher power output by optimizing stack pressure, stoichiometry and air flow to properly deliver the system design specifications.     

喀拉通克铜镍矿选矿车间管理信息子系统的设计与实现

介绍了选矿车间管理信息子系统的用户界面设计和通用模块的主要代码设计，讨论了基于C／S模式，综合运用Power Builder7．0和Oracle8．0开发管理信息系统(MIS)的设计思路与开发步骤。该系统经现场调试和使用表明，运行良好，效益显著，为同类系统的开发提供了借鉴经验。     

利用界面分析仪实现浓缩机自动控制

介绍了界面分析仪的原理以及在选煤浓缩机检测方面的应用，设计了一套浓缩机自动控制系统。     

硬脂酸改性硅灰石机理的红外光谱研究

通过对硅灰石改性前后红外光谱的测试，分析了硅灰石在高速搅拌条件下的改性机理。研究表明在这种情况下硬脂酸对硅灰石的改性主要是一种化学键合作用，红外光谱可以对硬脂酸的用量进行定量分折。     

硫化矿细菌浸出的半导体能带理论分析

许多硫化矿物为半导体 ,硫化矿氧化浸出过程实际是一半导体 溶液界面电子或空穴转移的过程。基于传统的半导体界面氧化理论 ,系统分析细菌存在时硫化矿 溶液界面电子或空穴转移步骤 ,提出黄铁矿、黄铜矿、铜兰细菌浸出过程的半导体 溶液界面电子及空穴转移模型 ,从半导体能带理论角度揭示了硫化矿细菌氧化浸出机理     

基于SJA1000的CAN_RS232/485接口卡的设计

论文针对煤矿监测监控系统中CAN总线与RS-485总线及PC串口如何互联的问题，提出了CAN_RS232／485接口卡的设计方案，介绍了基于SJA1000的CAN_RS232／485接口卡的功能，并详细描述了硬件模块设计、软件模块设计，最后说明了该卡的测试结果及应用背景。     

基于神经网络和Dempster-Shafter信息融合的煤岩界面预测

针对煤岩界面识别精度无法满足采煤机自动调度的情况，提出采用神经网络融合工作面的三边信息，使用D－S证据理论再将此信息和不断获得的煤岩界面识别信息进行二次融合，从而实现在线融合和在线预测，不断提高预测精度，仿真结果显示：该方法不仅对地质条件好的工作面有效，而且对断层也有一定的适应性；同时，具有优良的容错性。     

井下高压电网智能化综合保护系统的研究

在分析电网漏电故障规律的基础上,设计了一种适于不同中性点接地方式的电网的新型智能化综合保护系统。本文重点分析保护系统的原理,并介绍了硬件结构和软件框图。该保护系统经试验运行性能稳定,运行可靠,具有推广价值。     

基于P89LPC932A1容栅传感器智能接口的设计

在精密检测和高精度生产过程中,基于容栅式传感器的测量器具得到广泛运用,但一般为单机工作,不便于联机处理。研制了以P89LPC932A1单片机为核心的智能接口,并采用可视化编程工具C++Builder实现其与PC机的接口控制和数据处理功能,基于此接口实现了容栅传感器在生产过程中的检测与控制。