A study on the influence of model uncertainties on the performance of a feedback control based ASAC system
نویسندگان
چکیده
An important problem in systems such as aerospace interiors, automobile passenger compartments and other cavities is the control of low frequency interior noise. Active control of this noise may offer a potentially better alternative to passive control due to constraints of weight and space. Active structural-acoustic control (ASAC) is considered as an attractive strategy especially for controlling structure-borne noise. LQG based feedback control is one of the popular strategies that has been used in the context of ASAC. The LQG based strategies utilize an observer that estimates the states of the plant for feedback and therefore is a key element in the whole control loop. Since it uses a copy of the model of the plant for estimation, the accuracy of the model is crucial for its performance. This paper reports a study on the influence of the model uncertainties on the LQG based ASAC system. The influence of the uncertainties on the accuracy of the estimated states as well as on the closed loop system performance is studied. Uncertainties in material properties, geometry and boundary conditions are considered. Study on a rectangular box cavity with a flexible plate is reported.
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