This communication presents the design principle and experimental validation of two novel configurations magnetic negative stiffness dampers (MNSDs), both which are composed several permanent magnets arranged in a conductive pipe. The MNSD, as passive device, efficiently integrates eddy-current damping simple compact design, behavior depends on different arrangements magnets. When applied to structural vibration control, MNSD may achieve performance comparable with semi-active or active...

Stay cables are vulnerable to excessive vibration because of their inherently low damping properties. Described in this paper is an experimental investigation the control performance due passive negative stiffness dampers (NSDs) installed on a scaled stay cable model. The NSD used experiment was composed viscous damper and magnetic spring with adjustable coefficient close one end transverse direction. In general, performed much more effectively than conventional mitigating cable. As strength...

This paper systematically investigates the dynamic behavior of stay cables with passive negative stiffness dampers (NSD) installed close to cable end. A NSD is modeled as a combination spring and viscous damper. Through both analytical numerical approaches, parametric analysis damping are conducted evaluate vibration control performance on cables. Since an unstable element, boundary for maintain stability also derived. Results reveal that asymptotic approach only applicable positive or...

The installation of dampers close to cable anchorages is a common approach for stay-cable vibration mitigation. Inspired by the force-deformation relationship produced actively controlled dampers, passive negative-stiffness (NSDs) were proposed stay cables in past achieve excellent vibration-control performance. However, systematic comparison between NSDs and active control mitigation has rarely been reported literature. This paper systematically compares performances NSD performance two...

The present study formulated a three-dimensional (3D) vehicle-pavement coupled model to simulate the pavement dynamic loads induced by interaction where both vehicle vibration and deformation were considered. Based on this model, effects of road surface conditions, parameters, driving speed analyzed. impact factor, load coefficient, frequency distribution mainly concerned in study. simulated results indicated that under rough conditions vehicles are significantly higher than static loads....

Long bridge cables are vulnerable to unanticipated large vibrations induced by earthquakes, wind, and traffic loads. The use of various dampers, including inerter dampers (IDs), as an effective approach for the mitigation cable vibration has been extensively studied in recent years. This work presents innovative strategy wherein electromagnetic shunt damper (EMSD) is applied emulate mechanical behavior traditional IDs. proposed EMSD–ID design exploits analogous relationships between...

Abstract Among active, semiactive, and passive vibration isolation methods, active control can provide the best performances. However, high‐energy consumption hinders its wide applications in civil engineering field. This paper proposes a novel technique based on negative stiffness spring (NSS) semiactive device (SAD), aiming to achieve an performance by using low‐power technique. Due nature of potential energy, NSS enables system transient power flow that injects into structure avoids...

Soil embankment settlement causes concrete approach slabs of bridges to lose their contact and support from the soil. When soil occurs, slab will bend in a concave manner that sudden change slope grade near its ends. Meanwhile, loads on also redistribute ends slab, which may result faulting across roadway at slab. Eventually, rideability bridge deteriorate. The current American Association State Highway Transportation Officials code specifications do not provide clear guidelines design...

A linear theory for the free and forced vibration problems of a slightly sagging planar inclined cable with Tuned mass damper (TMD) installed is proposed using an analytical approach in this paper. Parameters such as geometry-elasticity parameter, internal damping, inclination, parameters position damping ratio, cable-damper proportion ratio stiffness are taken into consideration derived equations. Special cases discussed some simpler models can be obtained. Complex solutions equations their...

With increasing transportation speed, the excessive vibrations of high-speed trains (HSTs) have become a critical issue to be solved. This study presents an innovative semiactive suspension system consisting magnetorheological (MR) damper in parallel with magnetic negative stiffness (NS) element. The proposed dampers, called MRNS are integrated into secondary HST improve riding comfort. design can effectively enhance vibration mitigation performance MR dampers and compensate for gap between...

Inerter dampers (IDs) and other inerter-based vibration absorbers have elicited growing interest for mitigation of stay cables. This study systematically investigates the mechanism tuned IDs (TIDs) cables based on a continuous cable model. A TID consists an ID connected with spring stiffness in series (TID-S) or parallel (TID-P). On basis systematical parametric analyses, impact connections is evaluated, interrelations among ID, TID-S, TID-P are elaborated. Subsequently, detailed tuning...

High-energy consumption of an active control system hinders its wide applications for cable vibration control, whereas a semi-active damper (SD) alone cannot fully produce the target forces calculated from algorithm. To date, to emulate force using SD remains challenging due clipping phenomenon. Here, we propose low-power strategy track by with passive negative stiffness (NS) device embedded, which potential energy will be released at proper time project into vibrating enhancing performance....

This work proposes and investigates re-centering negative stiffness dampers (NSDs) for vibration suppression in high-speed trains. The merit of the feature is demonstrated by active controllers on a train. inspires replacement with NSDs, which are more reliable robust than controllers. proposed damper design consists passive magnetic spring semi-active positioning shaft function. former produces control forces, latter prevents amplification quasi-static deflection. Numerical investigations...

In this article, behaviors are investigated when the piezoelectric harvester array, consisting of four lead zirconate-titanate (PZT) circular diaphragms, charges ultracapacitors. It exhibits that V-I characteristic array is approximately linear within 3RC, demonstrates could be equivalent as source. Relevant factors on ultracapacitor charging power P, including circuitry impedance R, capacitor C, operating frequency f, and connection patterns, also studied. Meanwhile, interrelation between...

Many metropolitan cities suffer from a shortage of land supply, which results in new development areas with high building density. Construction activities, particularly piling processes, may generate excessive ground-borne vibrations. The nearby sensitive people, facilities and buildings (e.g. hospitals healthcare institutions) are often vulnerable to such However, the impact construction-induced vibrations on medical equipment is rarely discussed. vibration limits commonly adopted by...

Abstract Energy-harvesting vibration control strategy has been proposed and applied in different applications, including but not limited to automotive, mechanical, civil engineering. However, when facing uncertainties from both internal external environments, the robustness of its performance rarely evaluated. The energy-harvesting tuned mass damper (EHTMD) is a representative device integrated with function. This study investigates an EHTMD installed on structure multi-uncertainties. First,...