combined mimo adaptive and decentralized controllers for broadband active noise and vibration control

model errors in multiple-input multiple-output adaptive controllers for reduction of broadband noise and vibrations may lead to unstable systems or increased error signals. in this paper, a combination of high-authority control (hac) and low-authority control (lac) is considered for improved performance in case of such model errors. a digital implementation of a control system is presented in which the hac (adaptive mimo control) is implemented on a cpu and in which the lac (decentralized control) is implemented on a high-speed field programmable gate array. experimental results are given which demonstrate that the hac/lac combination leads to performance advantages in terms of stabilization under parametric uncertainties and reduction of the error signal.