A practical way to reduce the vibration of large structures is to use decentralised velocity feedback loops, where each actuator is driven by an input voltage proportional to the local velocity of the structure under control. One way of tuning the feedback gain is by minimising the global kinetic energy of the structure. However, in a practical system, this tuning technique requires many sensors scattered on the structure in order to estimate the kinetic energy. An alternative solution is to maximise the power absorbed by the controllers. In this paper, a rectangular plate with two inertial actuators subjected to random excitation is analysed. Two feedback loops are implemented, and control gains are tuned to minimise the global kinetic energy of the plate. Stability of the system is investigated through the root loci method, and local power absorbed by each actuator is analysed showing that the minimum of kinetic energy generally does not correspond to the maximum of power absorbed.
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