Affiliations: College of Aerospace Engineering, State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
Correspondence:
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Corresponding author: Xing Shen, College of Aerospace Engineering, State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, No. 29 Yudao Street, Nanjing 210016, Jiangsu, China. Tel./Fax: +86 25 84895702; E-mail:shenx@nuaa.edu.cn
Abstract: Synchronized switch damping (SSD) techniques using piezoelectric materials
have been used by different researchers for many years for the structure
vibration control. In these techniques, a piezoelectric patch is bonded on
or embedded into the vibrating structure and connected to or disconnected
from a network of electrical components through an electronic switch, which
is controlled by a digital signal processor (DSP), in synchronous with the
structure motion. Recently, Self-powered SSD techniques have emerged in
which the DSP is replaced by a low pass filter, thus making the whole system
self-powered. The control performance of the previously used Self-powered
SSD techniques heavily relied on the electrical quality factor of the shunt
circuit, thus limiting their control performance as the electrical quality
factor could not be increased beyond certain limit. However, in order to
bypass the influence of the electrical quality factor on the control
performance, a new Self-powered SSD technique has been proposed in this
paper in which the inductance in the previous Self-powered SSD techniques
has been replaced with a negative capacitance thus making the whole circuit
capacitive without resonance. However, it is found that the voltage on the
piezoelectric patch can still be inverted. In order to access the control
performance of the proposed technique in comparison with the previous
Self-powered SSD techniques, experiments are performed on a cantilever beam
subjected to both single mode and multimode excitations. Keeping the value
of negative capacitance slightly greater than the inherent capacitance of
the piezoelectric patch gave the optimum damping performance. Experiments
results confirmed the effectiveness of the proposed technique as compared to
the previous SSD techniques.
