Active vibration control of rocket RX-250-LPN payload structures

As it has been reported that there was a possibility of LAPAN rocket payload function failure due to excessive vibrations during lift-off. It is the purpose of this paper to investigate the feasibility of controlling actively vibrations of rocket RX-250-LPN payload structure during the launch and throughout its flight. This paper also serves as a preliminary process before conducting an active vibration control experiment in the Structural Dynamics Laboratory. In the analysis the payload and its structures were modeled as a single-degree-of-freedom lumped mass system. The structural system is excited at the base by the rocket-payload base interface acceleration in modal coordinates. The sensor measures response acceleration of the system, then it is fed back to the controller. In order to evaluate the effectiveness, three types of controllers, based on Active Vibration Absorber (AVA), state estimator by using Pole Placement (PP) method, and Linear Quadratic Gaussian (LQG) regulator, were designed for active vibration control process. Performance of each controller is presented to show the possibility of using the active control method to reduce vibrations of rocket payload structures. A new controller, a combination of AVA and LQG controller is introduced to improve the performance of AVA controller when the AVA controller mass used is very light.