Active vibration control using piezoelectric elements has been extensively studied due to the requirement for increasingly high performances. Semi-active control, such as Synchronized Switch Damping, is an alternative technique. It consists in switching a piezoelectric element to a specific circuit synchronously with the motion of the structure, unlike active control. This method requires very low power supply, but performances remain poor in the case of broad bandwidth excitation. This article proposes a new method which is a combination of the SSDI semi-active control and technique developed for active control and has low power supply requirements. It extends semi-active control to any type of excitation, while optimizing modal damping on several targeted modes. Experimental measurements carried out on a clamped free beam are presented and a significant damping on targeted modes is demonstrated.
Smart structures controlled by active algorithms proved their high efficiency. But active control requires external energy and heavy amplifier which strongly limit the applications in the transportation field. An alternative to active control is given by semi-active control which does not require operative energy but which is less efficient than active control. The proposed hybrid control associates the active control with semi-active control in order to benefit from the respective advantages of both methods. This hybrid control is intended to control vibration modes with the same performances than active control while reducing significantly the operative energy. An application on the second mode of clamped-free smart beam is presented. The results show that this new control approach appears to be able to decrease the required external energy and to reduce the power and consequently the weight of the active control amplifiers while maintaining the same damping performances. This control can be used, for example, in the transportation field to improve the lifetime of systems which use smart structure.
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