Linear and Nonlinear Controller Contrast for the Vibration Isolation System

The analysis of smart spring vibration isolation system is analyzed through MATLAB simulation. The results show suppressing dominant vibration mode of platform. In the paper controllers developed for the smart spring are linear and nonlinear. This paper deals with MIMO system analysis of low frequency dominant modes, which are critical, examined first by linear controller techniques and then with nonlinear controller. In this paper, instead of introducing the nonlinear model of system, nonlinear controller is developed in a trivial way, to get the improvement in vibration isolation, catering the disturbances in the system caused by environment, causing the controller to stop working as desired; a nonlinear controller is developed step by step by introducing more and more nonlinearity to the controller. In the paper results show frequency response of system without controller, with linear controller and with non linear controller and finally comparison between the linear and non linear controller. The article shows the achievement of requirement at the expense of introduction of nonlinear controller and shows that nonlinear controller gives a substantial reduction in the magnitude of vibration at the required frequency.