Active/semi-active hybrid isolation system with fuzzy switching controller

Abstract

This article designs an active/semi-active hybrid isolator using magnetorheological elastomer isolator and piezoelectric stack actuator to suppress the wide-frequency vibration in precision platform, which can be switched to active isolator, semi-active one, and passive one according to the spectrum signature of the excitation. First, the structure of the hybrid isolator is introduced. Then, the dynamic model of the hybrid isolation system is established, the model parameters are identified, and the switching condition for the hybrid isolator is derived by experiments. Next, considering variable amplitude and frequency vibration of the isolated system, an active and semi-active fuzzy switch controller is designed for piezoelectric stack actuator and magnetorheological elastomer hybrid isolator, which are independent of the system model, self-tuning, and robust. Finally, the numerical simulations are conducted under variable frequency excitations to evaluate the performance of the designed fuzzy switch controller, and the results show that the hybrid isolator, combined with the fuzzy switch controller, can attenuate full frequency vibration effectively.

Dynamic modeling and vibration control for isolation systems based on magnetorheological elastomers

“…A common method to address the uncertainty and the nonlinear phenomenon of systems is the fuzzy logical control algorithm. The simple output signals and calculation can effectively reduce the time delay of control algorithms to the utmost extent (Fu et al, 2018; Nguyen et al, 2018a). The displacement x ( t ) and the velocity x · ( t ) of the MRE-based isolator are selected to serve as input signals, and the motion of the machine is calculated for the transmissibility.…”

“…Besides the increasing research on modeling of MRE, it has been applied broadly for intelligent devices in varies fields, such as vibration absorbers (Bian et al, 2018; Kumbhar et al, 2018; Qian et al, 2017; Xin et al, 2017; Yuan et al, 2019) and vibration isolators (Behrooz et al, 2014; Fu et al, 2019; Nguyen et al, 2018b; Yang et al, 2014; Yu et al, 2015) due to the frequency shifting property. Several control methods, such as on–off control (Yang et al, 2014), fuzzy control (Fu et al, 2018; Nguyen et al, 2018a), Lyapunov-based seismic control (Behrooz et al, 2014), H-infinity control (Yu et al, 2015) and sliding mode control (Nguyen et al, 2018b) have been employed in control systems based on MRE. Considering that the time delay in control systems may result in unsatisfied effect or system instability, the response time of MRE material was investigated (Zhu et al, 2018).…”

Design and Control of a Dual-Stage Actuation Active Vibration Isolation System

“…J. Fu et al designed a hybrid isolator using PZT and magnetorheological elastomer isolator to suppress the wide-frequency vibration in precision platform. The results showed that the hybrid isolator can attenuate full frequency vibration effectively [21]. The most badly influenced disadvantage of the PZT is the short stroke [22].…”

Comprehensive predictive control for vibration suppression based on piecewise constant input formulation

“…Chen et al (2013) proposed a self-powered semi-active control method using one out of three piezoelectric devices as the power source. Subsequently, Fu et al (2018) proposed a hybrid system consisting of a magnetorheological elastomer isolator and piezoelectric stack actuator. Semi-active vibration control using charge inversion circuits has recently been developed.…”