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Title: On-line monitoring for multiloop control systems under load disturbance
Authors: Wang, B.
Chiu, M.-S. 
Keywords: L(c,max)
Multiloop control system
On-line monitoring
Relay bias
Relay feedback
Issue Date: May-2000
Citation: Wang, B., Chiu, M.-S. (2000-05). On-line monitoring for multiloop control systems under load disturbance. Chemical Engineering Research and Design 78 (4) : 605-611. ScholarBank@NUS Repository.
Abstract: Recently, relay based on-line monitoring procedures were proposed to identify the maximum closed-loop log modulus, L(c,max), for both SISO and multiloop control systems. However, the frequent load disturbances in the processes can usually distort the oscillations generated in the relay experiments. Consequently the identified L(c,max), which is calculated from the system stationary oscillations, will be less accurate. In this paper, an efficient procedure for tuning the relay bias is proposed to counteract the effect of load disturbances. Simulation results including a nonlinear stirred mixing tank example are used to illustrate the effectiveness of the proposed monitoring procedure.
Source Title: Chemical Engineering Research and Design
ISSN: 02638762
Appears in Collections:Staff Publications

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