Experimental investigation of a vibration isolation system using negative stiffness structure

Le, Thanh Danh; Ahn, Kyoung Kwan

doi:10.1016/j.ijmecsci.2013.02.009

Cited by 221 publications

(68 citation statements)

References 12 publications

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“…Experimental validation of NS vibration isolation mechanisms with their designs based on Euler post-buckled beams have been presented in [12][13][14][15][16]. In automotive engineering, applications include the design of NS suspensions [17,18] as well as vibration isolation seats [19][20][21] for improved passenger comfort. A highspeed railroad vibration isolation system employing NS elements was discussed in [22].…”

Section: Introductionmentioning

confidence: 99%

Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions

Chronopoulos

Antoniadis

Ampatzidis

2017

Extreme Mechanics Letters

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a b s t r a c tDespite the fact that the concept of incorporating Negative Stiffness (NS) elements within mechanical systems was formulated and validated more than 40 years ago, it has only recently received consistent attention. In this work, the design of a layered mechanical metamaterial having implemented NS inclusions is presented and its acoustic wave propagation properties are modelled. A dedicated twodimensional periodic structure theory scheme is developed in order to compute the frequency dependent damping loss factor of the metamaterial structure. The acoustic transmission properties through the modelled panel are computed within a Statistical Energy Analysis (SEA) scheme. It is demonstrated that the suggested layered metamaterial exhibits highly superior acoustic insulation performance close and above the acoustic coincidence range, thanks to the drastic increase of its structural damping properties implied by the NS elements. Additionally, the proposed configuration presents superior performance in a broadband frequency range when compared to a viscoelastic damping constraint layer of equivalent mass.

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Section: Introductionmentioning

confidence: 99%

Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions

Chronopoulos

Antoniadis

Ampatzidis

2017

Extreme Mechanics Letters

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“…Passive vibration control of a seating system can reduce vibration by using conventional spring and damper components in the seat suspension system, but due to its characteristic limitations, vibration control that targets multiple frequencies cannot be achieved even with a well-tuned traditional positive spring-damper system. Therefore, a quasi-zero static stiffness seat suspension system based on the combination of negative stiffness and positive stiffness springs was proposed by Le and Ahn (2013) [11] to improve the vibration control efficiency of a seating system, since the characteristics of high static stiffness and low dynamic stiffness can be used to eliminate seat vibration. In [12], a poly-optimal solution was sought for a seating system combined with a pneumatic spring and damper.…”

Section: Figurementioning

confidence: 99%

A Review of Low-Frequency Active Vibration Control of Seat Suspension Systems

Zhao

Wang

2019

Applied Sciences

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As a major device for reducing vibration and protecting passengers, the low-frequency vibration control performance of commercial vehicle seating systems has become an attractive research topic in recent years. This article reviews the recent developments in active seat suspensions for vehicles. The features of active seat suspension actuators and the related control algorithms are described and discussed in detail. In addition, the vibration control and reduction performance of active seat suspension systems are also reviewed. The article also discusses the prospects of the application of machine learning, including artificial neural network (ANN) control algorithms, in the development of active seat suspension systems for vibration control.

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“…This hinders the development of vertical seismic isolation systems. In recent years, negative stiffness structures (NSS) and quasi-zero stiffness (QZS) systems have been developed to overcome this disadvantage [9,10]. Nevertheless, the new approaches' applications are for the isolation of mechanical engineering only, and very limited researches focus on vertical seismic isolation.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Analysis of an Isolated Structure with QZS under Near‐Fault Vertical Earthquakes

Liu

Sheng

et al. 2018

Shock and Vibration

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Seismic isolation devices are usually designed to protect structures from the strong horizontal component of earthquake ground shaking. However, the effect of near-fault (NF) vertical ground motions on seismic responses of buildings has become an important consideration due to the observed building damage caused by vertical excitation. As the structure needs to maintain its load bearing capacity, using the horizontal isolation strategy in vertical seismic isolation will lead to the problem of larger static displacement. In particular, the bearings may generate large deformation responses of isolators for NF vertical ground motions. A seismic isolation system including quasi-zero stiffness (QZS) and vertical damper (VD) is used to control NF vertical earthquakes. The characteristics of vertical seismic isolated structures incorporating QZS and VD are presented. The formula for the maximum bearing capacity of QZS isolation considering the stiffness of vertical spring components is obtained by theoretical derivation. From the static analysis, it is found that the static capacity of the QZS isolation system with vertical seismic isolation components increases when the configurative parameter reduces. Seismic response analyses of the seismic isolated structure model with QZS and VD subjected to NF vertical earthquakes are conducted. The results show that seismic responses of the structure can be controlled by setting the appropriate static equilibrium position, vertical isolation period, and vertical damping ratio. Adding a damping ratio is effective in controlling the vertical large deformation of the isolator.

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Experimental investigation of a vibration isolation system using negative stiffness structure

Cited by 221 publications

References 12 publications

Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions

Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions

A Review of Low-Frequency Active Vibration Control of Seat Suspension Systems

Seismic Response Analysis of an Isolated Structure with QZS under Near‐Fault Vertical Earthquakes

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