Work

An Instantaneous Minimum Input Energy Control Strategy for Isolation Systems With Co-Varying Stiffness and Damping

Year: 2025

Type: article

Abstract: The seismic isolation stiffness and damping of magnetorheological elastomer (MRE) isolation bearings can adapt instantly to seismic load variations which can provide more intelligent seismic protection for engineering structures. The stiffness and damping change simultaneously following a defined functional relationship. For such systems, an instantaneous minimum input energy (IMIE) control strategy is proposed. This algorithm explicitly establishes the functional relationship between damping and stiffness, converting the optimization problem into a single-variable search for optimal stiffness while automatically determining the corresponding optimal damping. The IMIE strategy operates through total minimization of seismic-induced kinetic energy transmission to the structure and isolation system’s actuation energy consumption during each discrete time interval. A bridge isolation system with MRE isolation bearings is controlled by proposed IMIE algorithm. The control effects under different seismic excitation are compared with passive control, Linear Quadratic Regulation (LQR) control and fuzzy control method. Which reveal that the IMIE algorithm effectively control structural responses under seismic excitation and has unique advantages in reducing the input energy of structural and reducing the displacement of MRE bearings. It provides a new control thought and method for the engineering application of hybrid isolation systems.

Source: IEEE Access

DOI: 10.1109/access.2025.3592026

Authors: Leilei Xia, Dehong Wu, Lu Chen, Jingjing Li

Institutions: Shantou University, Jiaxing Nanhu University

Language: English

Topic: Vibration Control and Rheological Fluids

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $2,075