Abstract
A performance assessment method for nonlinear feedforward and feedback control systems is proposed in this paper. First, the existence of minimum variance performance bound for two nonlinear systems with different structures is analyzed, and the closed-loop model of nonlinear system is obtained with the help of iterative orthogonal least squares identification method. Then, the technology of variance analysis is introduced to establish the variance contributions due to both disturbances and controller. A nonlinear performance index for the feedforward and feedback control systems is estimated using an ANOVA-like variance decomposition method. Finally, a meaningful example is simulated to show the effectiveness of our method.
Highlights
The technology of control performance assessment (CPA) has attracted much attention in recent years, due to the extensive application of automatic control systems in industrial area
A feedforward variable is both measured and used in a feedforward and feedback control scheme, and the performance of the individual controllers can be assessed by the result of this paper, such that we can determine which controller should be principally adjusted to improve the performance of feedforward and feedback control systems
The problem of control performance assessment for nonlinear feedforward and feedback system is investigated in this paper
Summary
The technology of control performance assessment (CPA) has attracted much attention in recent years, due to the extensive application of automatic control systems in industrial area. For a special class of nonlinear SISO processes that can be described by the superposition of a nonlinear dynamic model and additive linear disturbance, Harris and Yu [15] presented a method to estimate the MVPLB using closedloop data. Continuing this idea, estimates of the MVPLB for the moderate valve stiction cases are proposed by Yu et al [16]. Yu et al [17] proposed a new CPA performance index for general nonlinear SISO models based on an ANOVAlike variance decomposition method. Based on some methods for the performance assessment of linear feedforward and feedback control systems, this paper is an extension to nonlinear systems.
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