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1.
Abhijit S. BadweSachin C. Patwardhan Ravindra D. Gudi 《Journal of Process Control》2011,21(7):1056-1071
Model accuracy plays a key role in the performance of advanced, model predictive control algorithms. Model fidelity is usually affected by routine operating condition changes, which necessitate reidentification. From several theoretical and practical considerations, it is recommended that such re-identification be performed under closed-loop conditions. The direct approach for closed-loop identification, owing to its simplicity, is better suited for MPC. In order to yield unbiased and consistent parameter estimates, however, this approach requires the noise model to be sufficiently parameterized. Towards this objective, high order ARX models are the most suitable candidates from the viewpoint of ease of parameter estimation. For multivariable systems, however, the identification of high order ARX models would require longer experiments to be performed. This being undesirable from a practical viewpoint, there is a need for a parsimonious parameterization that would retain the benefits of high order ARX models. In this work, we propose to use generalized orthonormal basis filters (GOBFs) to achieve this parsimonous parameterization. Further, we propose an approach to obtain reduced order models by emphasizing important frequencies so as to suitably shape the bias. We also show that the choice of the GOBF parameterization has another important merit, viz. their ability to perform well even with minimal perturbation data or short experiment times. The efficacy of the proposed approach is demonstrated via simulations on the benchmark Shell Control Problem and a laboratory quadruple tank setup. 相似文献
2.
This study proposes a technique based upon Fuzzy C-Means (FCM) classification theory and related fuzzy theories for choosing an appropriate value of the Variable Precision Rough Set (VPRS) threshold parameter (β) when applied to the classification of continuous information systems. The VPRS model is then combined with a moving Average Autoregressive Exogenous (ARX) prediction model and Grey Systems theory to create an automatic stock market forecasting and portfolio selection mechanism. In the proposed mechanism, financial data are collected automatically every quarter and are input to an ARX prediction model to forecast the future trends of the collected data over the next quarter or half-year period. The forecast data are then reduced using a GM(1, N) model, classified using a FCM clustering algorithm, and then supplied to a VPRS classification module which selects appropriate investment stocks in accordance with a pre-determined set of decision-making rules. Finally, a grey relational analysis technique is employed to weight the selected stocks in such a way as to maximize the rate of return of the stock portfolio. The validity of the proposed approach is demonstrated using electronic stock data extracted from the financial database maintained by the Taiwan Economic Journal (TEJ). The portfolio results obtained using the proposed hybrid model are compared with those obtained using a Rough Set (RS) selection model. The effects of the number of attributes of the RS lower approximation set and VPRS β-lower approximation set on the classification are systematically examined and compared. Overall, the results show that the proposed stock forecasting and stock selection mechanism not only yields a greater number of selected stocks in the β-lower approximation set than in the RS approximation set, but also yields a greater rate of return. 相似文献
3.
讨论了利用ARX在AutoCADR14上进行变径二岔 管和三岔管曲面CAD二次的方法,文中讨论了的方法可用于其它类似的基于AutoCAD的CAD系统的二次开发。 相似文献
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本文针对AutoCAD中常用图形变换方法与MFC的冲突,提出利用ARX的AcGe库的图形“先变换后显示”,不仅能解决上述冲突,还加快了绘图速度,增加了编程与显示的灵活性。 相似文献
6.
ARX是基于AutoCAD进行CAD软件开发的新一代开发工具。本文讨论了利用ARX在AutoCAD RM上进行岔管过渡段曲面CAD开发的方法。 相似文献
7.
介绍了面向对象的设计思想和对象的抽象机理在电网 CAD( PWCAD)系统中的应用以及 Object ARX编程技术。阐述了通过利用 Auto CAD核心数据库的开放结构和 Object ARX提供的基类及类的继承、派生机制定义专业对象的过程以及建模系统的数据交换技术 ,并由此建立了 PWCAD的对象模型。 相似文献
8.
利用AutoCAD提供的COM接口,在Visual J 6.0环境下开发了一个Java应用程序,实现了AutoCAD的动态加载以及ARX应用程序和相应的菜单、工具条的动态自动加载. 相似文献
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利用AutoCAD开发工具ARX ,在VisualC ++5 .0环境下编程开发水力机组辅助设备元件图ARX应用程序 ,并将它装入AutoCADR1 4软件中 ,直接作为AutoCAD的命令使用 相似文献