High‐performance vibration isolation technique using passive negative stiffness and semiactive damping

Abstract

Among active, semiactive, and passive vibration isolation methods, active control can provide the best isolation performances. However, high-energy consumption hinders its wide applications in civil engineering field. This paper proposes a novel vibration isolation technique based on a passive negative stiffness spring (NSS) and a semiactive device (SAD), aiming to achieve an active isolation performance by using a low-power semiactive technique. Due to its nature of negative potential energy, an NSS enables the semiactive isolation system to provide negative transient power flow that injects power into the structure and avoids the clipping phenomenon of semiactive control forces. Consequently, the combined NSS and SAD isolation system can perfectly generate the theoretical control forces calculated by an active control algorithm and achieve a considerably improved semiactive isolation performance. The prospects and performance advantages of the proposed NSS and SAD isolation system are validated through a series of numerical simulations of single-degree-of-freedom and multi-degree-of-freedom structures excited by various types of ground motions and a benchmark building model excited by seismic ground motions.

A control strategy using negative stiffness and semi‐active viscous damping for fully tracking active control force for bridge cables: Principles and simulations

“…Through both theoretical 29–31 and experimental 32–35 studies, SDs can achieve better vibration control performances than passive dampers. To evaluate the performance of the SD, the performance of ideal active control was also analyzed for comparison in some studies 36–39 . In general, there still exists a performance gap between the SD and the active control system.…”

“…To evaluate the performance of the SD, the performance of ideal active control was also analyzed for comparison in some studies. [36][37][38][39] In general, there still exists a performance gap between the SD and the active control system. Compared with the target control force calculated from the control algorithm, the control forces produced by the SD are often clipped due to its intrinsic constraint.…”

“…Interestingly, the analysis of active cable vibration control revealed that the active control forces regulated by the linear quadratic regulator (LQR) algorithm possess a negative stiffness (NS) feature. [37][38][39] Therefore, NS in a passive or semi-active manner was proposed by some researchers to produce similar force hysteresis of the active control system. The merits of both semi-active NS 39,40 and passive NS [41][42][43][44][45][46][47][48][49] have been studied for cable vibration control.…”

Suppressing vibration of structures using nonlinear single unit impact dampers via Taguchi method

“…5 The optimal performance of these controllers in different power conditions is not guaranteed, and therefore their use is limited. 6 Otherwise, active control systems also reduce the system response depending on the force applied. 7 This applied force is generated by active control devices connected to the building.…”

Seismic adaptive control of building structures with simultaneous sensor and damper faults based on dynamic neural network

“…The use of active control strategies for improving the seismic behavior of structures has attracted much attention in recent decades (Adeli & Saleh, 1998, 1997; Kayabekir et al., 2021). However, in civil infrastructures, the high capacity actuator is required that is not practical and economical (Shi et al., 2021). As an alternative solution, semi‐active control with smart variable dampers is widely accepted by engineers (Gutierrez Soto & Adeli, 2019; Zelleke & Matsagar, 2019; Zhang & Phillips, 2019).…”