Nonlinear Model Order Reduction Using Block Structured Models for Large Processes

13th Topical on Refinery Processing
2010 AIChE Spring Meeting
AIChE Spring Meeting and Global Congress on Process Safety
March 21, 2010 - 8:00pm

Please note: sound does not begin until approximately 30 seconds into the presentation.

Typically mathematical models of physical and chemical processes are large and complex because of complications and nonlinearities of physical processes. The importance of mathematical models is evident for optimization and control purposes. Large rigorous mathematical models are cause of high computational loads and computational times, restricting the use of such models for online applications. This provides the opportunity to use reduced models, which are match of NL processes within defined 'operational domain' which can achieve low computational loads and faster simulation times.

Block structured models (in particular Hammerstein structure) have been used for identification purposes efficiently, but have not been used for model reduction purposes. Block structured models have advantage in approximation and identification; the approximated or identified block structures give insight to the complex and complicated process, hence providing handle for reduction. In this study, input-state (IS) Hammerstein block structure is used for the approximation and model reduction of NL process. Initially input-output Hammerstein block structure has been used for approximation (identification) of NL process. The methodology has been extended to IS Hammerstein structure. In this work, it is shown that I/S Hammerstein structure can be derived by Taylor series expansion (under trivial assumptions). Mathematically, I/S Hammerstein structure is given (as in equation below) and is shown in Fig. (1);

This recording is FREE to members of the Fuels and Petrochemicals Division of AIChE. AIChE members may join the Division for only $10. Join F&PD now and return to this page with your new log-in and you will receive this presentation for FREE.
F&PD Members: Simply click on “click here to buy this archived webcast ” below and your ‘0’ price will appear in your shopping cart.
Professional Development Hours
0.5 PDHs
You will be able to download and print a certificate for these PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.
Presenter(s): 

Would you like to access this content?

No problem. You just have to complete the following steps.

You have completed 0 of 2 steps.

  1. Log in

    You must be logged in to view this content. Log in now.

  2. Purchase Technical Presentation

    You must purchase this technical presentation using one of the options below.
    If you already purchased this content recently, please click here to refresh the system's record of ownerships.

Pricing

Credits 0.5 Use credits
List Price $25.00 Buy now
AIChE Members $15.00 Buy now
AIChE Fuels and Petrochemicals Division Members Free Free access
AIChE Undergraduate Student Members Free Free access
AIChE Graduate Student Members $15.00 Buy now
Related Topics: