Communication Dans Un Congrès Année : 2024

Calibration of a Digital Piezoelectric Shunt for Vibration Mitigation from Capacitance Measurements

Résumé

Piezoelectric shunts can be used efficiently to reduce vibrations of flexible structures when the electrical impedance is designed correctly and precisely tuned to enhance the overall damping performance. The electrical impedance can be composed of physical electrical components such as resistors, inductors, and capacitors, or it can be synthesized using a digital control unit. Such a digital control unit connected to a piezoelectric transducer is often referred to as a digital piezoelectric shunt and allows, in theory, any electrical circuit to be synthesized by measuring voltage and imposing current. Several calibration methods exist in the literature for piezoelectric shunts, allowing a suitable calibration to be chosen depending on the individual application of the shunt. However, a coherent use of these methods requires knowledge of the structural parameters in terms of the natural frequency, the modal capacitance, and the electromechanical coupling factor. When a detailed numerical model is unavailable, these parameters must be determined experimentally. In this study, it is demonstrated that the required structural parameters can be obtained from measurements of the dynamic capacitance of the piezoelectric transducer. The influence of the non-targeted vibration modes on the calibration of the shunt is included in a modal blocked capacitance, allowing calibration methods from the literature to be used directly on analog or digital shunts for vibration damping of a flexible structure. A numerical example of a cantilever beam illustrates the accuracy of the proposed method for the calibration of a series RL shunt. The measurement of the dynamic capacitance can be performed directly using the digital shunt hardware when applying a current and measuring the voltage across the piezoelectric electrodes. Therefore, additional sensors or actuators are not required for calibration of the shunt.
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Dates et versions

hal-04853858 , version 1 (22-12-2024)

Identifiants

  • HAL Id : hal-04853858 , version 1

Citer

Jens Richardt, Boris Lossouarn, Jan Høgsberg, Jean-François Deü. Calibration of a Digital Piezoelectric Shunt for Vibration Mitigation from Capacitance Measurements. 33rd International Conference on Adaptive Structures and Technologies, ICAST 2024, May 2024, Atlanta, United States. ⟨hal-04853858⟩
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