Active isolation using a Kalman estimator-based controller

A novel feed-forward active vibration/shock isolation scheme that is based on the use of a Kalman estimator (KE) has been developed. It does not require real-time adaptation and yet maintains its effectiveness when the attributes (such as the frequencies) of the disturbance change. The proposed controller is always second order, regardless of the complexity of the structure under control. In addition to feeding forward the measured base acceleration, the acceleration at the location of interest on the structure is measured and fed back through the KE gain. Using numerical and experimental data, the KE-based controller is demonstrated to be highly effective in reducing the transmission of the base excitation to the structure.