Superharmonic vibration and its reduction in SSD control by increase of voltage inversion time

Synchronized switch damping (SSD) techniques have been developed for structural vibration suppression in recent years. In SSD control, a self-sensing approach can invert the voltage on piezoelectric materials without sensors or real-time controllers. However, this approach has been challenged since the voltage generated by the vibration of controlled mode becomes minor compared with noises as the increase of damping performance. Furthermore, the voltage decay caused by the current leakage is dominant when the host structure vibrates at a low frequency. This paper proposes a self-sensing approach based on the zero-crossing detection (ZCD) technique with voltage decay compensation. The switching delay, voltage decay, and higher-order harmonic vibration are considered in the electromechanical model of the SSD system. Accordingly, a band-limited proportional-differential (PD) circuit is implemented to offset the voltage decay and generate zero-crossings at displacement extrema simultaneously. Experiments show that the proposed method is still effective when the voltage decay in the SSD control is dominant.

Section: Implementation Of Signal Conditioning Circuitmentioning

confidence: 99%

Self-sensing synchronized switch damping based on zero-crossing detection with voltage decay compensation

Zhang

Deng

et al. 2023

“…To enhance the performance, the inverted voltage is magnified in SSDV technique by using external voltage sources in series with the inductor. On the dark side, the large voltage source may induce instability because additional vibrations at super-harmonic frequencies are usually excited due to the rectangular waveform of the switched actuator voltage [20].…”

Section: Introductionmentioning

confidence: 99%

Adaptive switching vibration control of flexible piezoelectric structure

Wei¹,

Ren²,

Wang³

et al. 2019

This paper aims at developing a compact-size and low-power active control system for harmonic vibration attenuation. A new switching control system is proposed for this purpose. In the new system, the power amplifier in charge of voltage amplification is replaced by a filterless switching circuit, which directly receives digital pulse control signal from the external adaptive controller and produces high voltage in pulse form across PZT. The compact circuit design combining with adaptive filter dramatically simplifies the control system by removing digital-toanalog converter and voltage (current) feedback originally used in most amplifiers for less distortion. In particular, the hybrid switching control mode of the new system is specially addressed. The theoretical and experimental analysis reveals that hybrid switching control brings a great power reduction at the price of small control performance loss. Finally, the validating experiments are carried out, and experimental results show remarkable effectiveness for vibration suppression.

“…In SSD semi-passive systems, the piezoelectric voltage is inverted repeatedly by switching the shunt circuit synchronously with mechanical displacement. Several variations of the SSD methods, including SSD on short circuit (SSDS) [16], SSD on inductor (SSDI) [17][18][19], and SSD on voltage source (SSDV), have been developed [20,21]. The SSDI technique is the most prevalent of the SSD methods because of several advantages; it does not require a very large inductor for lowfrequency application and it is robust to environmental variation.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental analysis of self-sensing SSDNC technique for semi-active vibration control

Wei

Wang

Ren

et al. 2018

A semi-active vibration control technique using nonlinear synchronized switch damping on negative capacitance (SSDNC) is proposed in this article. SSDNC, as one of the effective nonlinear vibration damping techniques, has been intensively investigated and discussed in recent years. In comparison with the classical SSDNC technique, the proposed self-sensing approach realizes the SSDNC technique by using analog circuits, which require neither external sensors nor controllers. In particular, the stability of the switching shunt circuit using negative capacitance (NC) is addressed. The theoretical and experimental analysis reveals that the saturation of the operational amplifier in synthetic NC can prevent the proposed SSDNC circuit from trapping into instability and yielding the best attenuation performance. The final experiments show that the proposed approach exhibits excellent single-mode damping performance and is sufficiently robust.