b. Passive and Active Shock & Vibration Control


Principal Investigator: Jae-Hung Han
Participated Graduate Research Assitant: N/A
Related Project: N/A


Summary:
Vibration control group in the triple S Lab develops the vibration suppression techniques for aerospace structures using smart materials such as piezoelectric materials. In order to suppress a low-frequency, low-damping vibration, we applied shunted piezoelectric materials to a cantilevered beam and a plate in a passive or a semi-active way. We analyzed the sensitivities of the damping performance for shunted piezoelectrics with different shunt circuit types.


Related Recent Publication:
Park, J.-W., Han, J.-H.,, and Oh, H.-U., “Sensitivity Analysis of Shunted Piezoelectrics in Vibration Damping Performance under Temperature Variation,” International Congress on Sound and Vibration (ICSV19), Vilnius, Lithuania, Jul.10, 2012.
Park, J.-W., Han, J.-H.,, and Kang, L.-H., “Vibration Control using Shunted PUMPS,” The 7th World Congress on Biomimetics, Artificial Muscles and Nano-Bio (BAMN), Jeju Island, Korea, Aug. 26-30, 2013.


  • Vibration Control using Shunted Piezoelectric Materials

1. Goals

– Enhencement of damping performance at a resonant frequency of a structure
– Development of a simple, light-weight, and robust damping device for aerospace applications

2. Approaches

– Analytical modeling of shunted piezoelectric using electro-mechanical coupling
– Experimental implementation of shunted piezoelectrics
– Analytical and numerical analysis of performance sensitivity

3. Research Achievements

▶ Performance Analysis of Shunted Piezoelectrics

– Mathematical modeling of shunted pieozlectrics using piezoelectric coupling effect
– Tuning of shnut circuit element for the maximum damping at a mechanical resonance

Complex stiffness of shunted piezo

▶ Experiment Setup for Vibration Control in Passive and Semi-active Ways

– Experiment setup and implementation of shunt circuit
– Construction of semi-active switching controller for shunt circuit

Exp Setup

– Experiment results using semi-active synchronized switching controller

Experiment Results - cantilevered plate

▶ Sensitivity Analysis of Damping Performance for Shunted Piezoelectrics

– Damping performance index for RES is selected as a loss factor from an effective modulus
– Damping performance indices for RSPs are selected as maximum magnitudes of a transfer functions around resonances

 SA1

– Sensitivities for a resistive shunting are analytically derived using a Taylor’s series

SA2

– Sensitivities for resonant shuntings are numerically derived with parameter variations

SA3

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