基于COSMOSworks的钢板焊接件的工程分析

机械零件的工程分析是产品设计的一个重要组成部分,随着计算机辅助技术的发展,运用计算机对机械零件进行相关的工程问题分析已成为一个重要的发展方向.SolidWorks 作为三维CAD软件的代表,也提供了相应的CAE功能,本文就该问题进行专门的探讨.     

基于PXI总线的工程车辆液压自动检测系统设计

介绍了一种工程装备液压系统性能自动检测系统.该系统以PXI总线系统构成硬平台,可更换适配器构成液压系统测试传感器与测试资源的物理连接与各种信号的调理,以LabWindows/CVI构成软平台,实现了从仪器自检-系统标定-自动检测-数据处理分析-打印测试报告等的自动化处理.实践表明,该系统拥有优良的可扩展性和工程实用性,在液压系统检测和故障诊断领域具有广阔的应用前景.     

基于机电综合特征的发电机转子故障诊断系统的研究

首先分析了转子绕组匝间短路、气隙静偏心、气隙动偏心、转子不平衡等发电机转子故障发生时的振动特征和定子绕组并联支路间环流变化特征,得出不同故障引起的环流特征和振动特征的机电综合特征存在差别,从而提出了基于转子振动和定子绕组并联支路环流的机电综合特征的发电机振动故障识别方法。然后利用LabVIEW软件和PCI-6251数据采集卡,研制了基于虚拟仪器技术发电机故障检测系统,能够实现发电机信号的采集、在线分析、数据库管理、发电机参数查询、故障诊断等功能,并在SDF-9型故障模拟实验机组上完成调试,达到预期效果。     

Oat lipids

Oats are a significant world crop. While nutritional interest in food oats has concentrated on oats as a source of dietary fiber, the lipid component has both nutritional and technological potential. Thus, the lipid fraction of the oat grain determines in large measure its energy content and has a significant impact on nutritional quality. The oat lipids mediate the pasting properties of oat starch and hence influence functionality. Lipids are also implicated in the flavor/off-flavor attributes of oats. These aspects of oat lipids are reviewed together with analytical methods for assessing the lipid content of oats.     

低温乙烯贮存装置C02/C03压缩机振动原因及对策

对低温乙烯贮存装置闪蒸气压缩机振动原因进行了分析。并据此提出了减小振动的措施,从而使压缩机得以稳定运行,且延长了运行周期。     

Nondestructive determination of fatty acid composition of husked sunflower (Helianthus annua L.) seeds by near-infrared spectroscopy

Determination of the fatty acid composition of sunflower (Helianthus annua L.) seeds by near-infrared (NIR) spectroscopy was examined. Sunflower seeds were husked (removed from their hulls by a husking machine or manually with a knife). NIR spectra of these seeds were scanned from 1100 to 2500 nm at 2-nm intervals in a whole-grain cell with a wideangle moving drawer for machine-husked seeds or in a single-grain cup for a manually husked single-grain seed. The extracted oils from machine-husked seeds also were scanned by sandwiching them between a pair of slide glasses to create a thin layer and by placing them on a syrup cup. For extracted oil, the absorption band around 1720 nm filled out to the shorter wavelength region in the NIR second-derivative spectra as the percentage of the linoleic acid moiety increased, because linoleic acid absorbs in this region. On the other hand, for husked seeds and for a single-grain seed, as the percentage of linoleic acid increased, the trough at 1724 nm where oleic and saturated acids absorb decreased in the second-derivative NIR spectra. Determination of the fatty acid composition of sunflower seeds could be carried out successfully according to the NIR spectral pattern for both extracted oil (r=−0.989) and kernel seed (r=−0.993). This is important, especially for a manually husked single-grain seed (r=−0.971), because it can still be germinated after such nondestructive analysis.     

VBA程序接口在仪表设计中的应用

基于VBA二次开发工具,给出Auto CAD PID图自动生成仪表索引表和坐标文件自动生成仪表位置图的设计思路与主要程序。实际应用结果表明:该程序可极大地减少设计仪表时的工作量和人为误差。     

镶装式密封环热应力的有限元分析

通过圆柱面过盈联接公式计算镶装式密封环过盈量,采用有限元分析方法建立了二维轴对称模型,并施加了合理的边界条件,得出了镶装式密封环最小过盈量和最大过盈量的应力场和温度场分布。     

试井资料确定平面压力分布场方法研究

本文以数值试井技术为依托进行试井资料确定平面压力分布场方法研究,形成了一种以数值试井为主、集动静态分析和油藏工程方法于一体的综合分析方法,解决了中低渗砂岩油藏开发中注采对应关系、水驱开发状况确定等难题。在介绍数值试井基本特点的基础上,阐述了数值试井的技术原理和参数敏感性分析,并介绍了该技术在中原油田的应用实例和效果。     

煤化工项目在线水质分析仪的选型与应用

煤化工项目中的在线水质分析仪主要应用在水处理及热电锅炉系统,其适用性对装置的安全、节能、环保运行极其重要。论述了煤化工在线水质分析仪的选型原则,结合工程实例介绍了p H值与电导率分析仪、溶解氧与浊度分析仪、COD与NH3-N分析仪等在线水质分析仪的选型,并结合现场实际应用中存在的问题,提出了改造措施。