Bladed rail; High modal density; Lightly damped structure
Abstract :
[en] Although simple and effective, the performance of passive control techniques is limited in terms of authority and robustness. This paper studies the potential of using an active control system for mitigating the vibrations of a bladed rail assembly. First, we discuss the optimal placement of the piezoelectric patches. Although locating the patches at the blade root maximizes the strain energy, it results in important perturbations of the aerodynamic flow. Therefore, a pair of sensor and actuator is placed inside the bladed rail in order to have an as large as possible electromechanical coupling and a collocated system, i.e., alternating pole and zero. Second, an active control strategy using an integrator is designed and assessed in terms of attained closed-loop damping. The performance of the active damping is eventually compared with that of classical piezoelectric shunt damping.
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