Influence of mechanical layout of shape memory alloy damping inerter (SDI) systems for vibration control

Abstract

A shape memory alloy damping inerter (SDI) with an SMA placed in parallel with an inerter and then in serial with a spring was developed as a vibration control device, where the inerter is utilized to amplify the deformation of SMA to improve the energy dissipation capacity. However, SDI can have other mechanical layouts when an SMA, an inerter and a spring are involved, which may exhibit different control effectiveness. Moreover, explicit design methods aiming to achieve the optimal performance of the SDI systems remain unexplored. In this study, SDIs with different mechanical layouts are proposed and compared, and design method for the SDI-equipped structure is developed. Firstly, the mechanical model of a structure with SDI systems is separately established. Parametric analysis is then conducted in terms of the displacement response, acceleration response and damping enhancement effect. Selection for appropriate SDI mechanical layout can be identified based on parametric analysis results. Additionally, design method based on maximizing the damping enhancement effect to fully develop the energy dissipation capacity of the SMA under the target structural response mitigation ratio is proposed. The performance of the optimal designed SDI-equipped structures is finally evaluated in the time-domain. Results show that both the displacement and acceleration responses of the SDI-equipped structures can be effectively mitigated by using the proposed optimal design method. Among the optimized SDI systems, the energy dissipation capacity of SMA is almost similar. Different SDI systems differ in the energy dissipation characteristic. The SMA-spring-paralleled SDI exhibits minimum damping force, indicating a better damping enhancement effect and less material demand of SMA than the other SDI systems.

Characterization of energy dissipative cushions made of Ni–Ti shape memory alloy

“…The experimental study showed that the proposed restrainer exhibits a stable energy dissipator with self-centering capability. Zhang et al [49] amplified the SMA deformation using different inerter mechanisms to improve its energy dissipation capacity and vibration mitigation. It was found that the SMA-spring-paralleled inerter system enhances damping characteristics and requires lesser SMA material.…”

Optimization of inerter system for seismic response control based on a modified genetic algorithm with differential crossover strategy

“…Structural vibration control techniques can effectively control the dynamic response of a structure under earthquake loads. [1][2][3][4][5][6][7][8] Based on many studies, energy dissipation devices can effectively reduce the structural vibration response caused by earthquake loads. 9,10 As a new type of energy dissipation and damping device, the inerter system has attracted much attention in the engineering field.…”

Optimal Design of Damped Structure with Inerter System Based on Modified Harmony Search Algorithm

“…Pan and Zhang et al [29][30][31] proposed principles and methods for the optimal design of inerter system considering structural performance demand and control cost simultaneously based on random vibration theory. Subsequently, Zhang and Pan et al [32][33][34] discovered the principle of damping enhancement of the inerter system based on the analytical solution of the random vibration response, and the principle can provide a clear physical explanation of the mechanism of the inerter system.…”