Temporal variation in modal properties of a base-isolated building during an earthquake

Temporal variation of dynamical modal properties of a base-isolated building is investigated using earthquake records in the building. A batch processing least-squares estimation method is applied to segment-wise time-series data. To construct an input-output system, an auto-regressive model with exogenous input （ARX） of second-order including a forgetting coefficient as a weighting coefficient is used for the estimation of modal parameters. The fundamental and second natural frequencies and the damping ratios of the fundamental and second natural modes of the base-isolated building are identified in the time domain. The identified results are consistent with the results obtained from the micro-tremor vibration data, forced-vibration test data and earthquake records in the present base-isolated building in the case of taking into account the amplitude-dependency of the iso- lators and viscous dampers. It is finally pointed out that several factors, e.g., amplitude dependency of the isolator and damper system and special characteristics of the series-type viscous damper system, may be related complicatedly with the temporal variation in modal properties of the above-mentioned system.     

Iterative learning control of SOFC based on ARX identification model

This paper presents an application of iterative learning control (ILC) technique to the voltage control of solid oxide fuel cell (SOFC) stack. To meet the demands of the control system design, an autoregressive model with exogenous input (ARX) is established. Firstly, by regulating the variation of the hydrogen flow rate proportional to that of the current, the fuel utilization of the SOFC is kept within its admissible range. Then, based on the ARX model, three kinds of ILC controllers, i.e. P-, PI- and PD-type are designed to keep the voltage at a desired level. Simulation results demonstrate the potential of the ARX model applied to the control of the SOFC, and prove the excellence of the ILC controllers for the voltage control of the SOFC.     

基于Object ARX的剃前齿轮滚刀CAD系统二次开发

在分析Auto CAD2000不足的基础上，提出以Object ARX为二次开发工具，以参数化设计为基础，用Visual C＋＋编程，开发剃前齿轮滚刀CAD系统，从而实现了剃前齿轮滚刀设计的参数化绘图，有效地提高了剃前齿轮滚刀设计效率和设计水平。     

基于Oracle的AutoCAD图纸文档管理

简述了Oracle数据库在AutoCADARX二次开发中的应用。重点讨论了使用0040 C＋＋ ClassLibrary访问Oracle数据库LOB数据类型的解决方法。     

基于AutoCAD二次开发的钣金件CAD/CAM系统的设计与实现

介绍了使用Object ARX在Auto　CAD2000平台上钣金件CAD/CAM系统的实现,该系统以数据库为支撑,由排样任务设置、优化排样、后置处理三个模块组成,具有集成度高,操作性好,功能强大的特点,具有良好的推广价值。     

基于Object ARX的综合地理信息系统的构建与应用

阐述了综合地理信息系统在地理信息系统技术发展中的重要位置,以Object ARX等技术为基础了构建了综合地理信息系统平台,并对其在三维地学建模方面的应用试验进行了研究,对综合地理信息系统的发展进行了展望.     

基于ARX液压CAD软件的研究与开发

以液压产品数据库为基础,利用AucoCAD 2002作二次开发,以VC~( )6．0为开发环境,结合SQL Server数据库考虑开发了一套从系统原理图绘制、静态参数计算到按设计参数选择元件、空间管道布局集于一体的液压系统CAD软件。     

ObjectARX2000应用程序自动加载的实现

通过采用修改注册表法对ObiectARX所开发应用加载的讨论，表明该方法便于程序化实现，可以利用安装程序实现MⅨ应用程序自动加载，给出了VC 实现ARX应用的自动加载和安装实例，可给应用ARX开发应用的人员提供有益的参考。     

ARX模型在液位控制系统中的应用研究

以比例阀的输出为系统输入,液位值为系统输出,对液位控制系统进行ARX建模研究。选用AIC准则作为系统模型阶次的选择原则,以最小二乘法来辨识模型参数,辨识了系统的ARX模型。模型的预测输出和实际输出的比较结果证实了ARX建模在液位控制系统中的有效性。     

Auto CAD二次开发在钢岔管设计中的应用

介绍了Auto CAD二次开发的背景和现状,总结了二次开发中常用的工具和方法。然后,通过钢三梁岔管二次开发系统的实例证实了开发中常用手法的应用。