A quasi-zero-stiffness vibration isolator using a cam mechanism with user-defined profile

Li, Ming; Cheng, Wei; Xie, Ruili

doi:10.1016/j.ijmecsci.2020.105938

Cited by 80 publications

(6 citation statements)

References 36 publications

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“…While the VLD graphs give a great indication of the vibration isolation performance across the frequency range, there are instances where the there is only minor vibration amplification in the APU foam at 12 Hz; however, the transmissibility is 150% at this frequency. The cam‐roller QZS mechanism developed by Li showed the transmissibility amplification peaked at a 2 Hz and then rapidly diminished from the 5 to 20 Hz range [ 25 ] to become isolation; however, the metamaterial isolator developed showed vibration isolation across the entire frequency range. Apparatus like the cam‐roller does show more predictability in their transmissibility and vibration isolation capacity across their working frequency range, whereas the metamaterial springs require fine tuning and are application specific due to the varying transmissibility in their working range.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

Zolfagharian,

Picken,

Bodaghi

et al. 2023

Adv Eng Mater

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This research introduces a novel approach for reducing the vibrations experienced by passengers in vehicles using metamaterials embedded in polyurethane foam to improve the existing vibration isolation capacity of car seats. An exploration of quasi‐zero and negative stiffness metamaterials has been conducted to develop metamaterial springs that exhibit a region of high‐static and low‐dynamic stiffness to achieve vibration isolation. Metamaterials were developed using low‐cost open‐source additive manufacturing methods and thermoplastic polyurethane filament. This investigation followed a process of determining the geometric, material, and systemic design requirements, to identify the quasi‐zero and negative stiffness force‐displacement regions. Small‐scale models of a car seat were developed by embedding the designed metamaterials into different grades of polyurethane foam and completing static and dynamic testing. The results demonstrated practical applications for implementing metamaterial springs into polyurethane foam to enhance vibration isolation under dynamic loading. The developed material library, and the key geometric variables in the metamaterial design allow for application specific solutions where the selection of the appropriate metamaterial and foam combination can be tailored to suit the system requirements.This article is protected by copyright. All rights reserved.

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Section: Experiments and Resultsmentioning

confidence: 99%

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

Zolfagharian,

Picken,

Bodaghi

et al. 2023

Adv Eng Mater

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“…As one of the vibration isolation devices, the quasi-zero stiffness (QZS) isolation system has received much research attention [22][23][24][25][26][27][28][29]. The pioneer book of Alabuzhev et al [30], which was published in 1980, systematically introduced the vibration protecting system with QZS characteristics.…”

Section: Introductionmentioning

confidence: 99%

A new magnetorheological quasi-zero stiffness vibration isolation system with large zero stiffness range and highly stable characteristics

Deng

Sun

et al. 2023

Preprint

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Various quasi-zero stiffness (QZS) systems have been developed and applied in the vibration control domain in recent years. However, most QZS systems are usually unstable against external disturbances, and the QZS ranges of them are very limited. To address the above issues, this study develops a highly stable QZS vibration isolation system integrated with magnetorheological fluids (MRFs). The MRFs endow the vibration isolation system with stiffness variability in vertical and lateral directions against external disturbances, which innovatively solves the unstable problem of the QZS system. Meanwhile, the stiffness variability also makes the system adaptable to vibrations with different frequencies, so the system can deliver the best vibration isolation performance in response to various excitations. The system consists of a vertical isolation unit and a lateral isolation unit. Through paralleling a nonlinear positive stiffness QZS component with a nonlinear negative stiffness QZS component in the vertical isolation unit, a large QZS range in the vertical direction and smaller stiffness are realised, thus improving the vibration isolation performance. In this study, the vibration isolation system is designed and prototyped; its QZS characteristics and adjustable stiffness features in both the vertical and lateral directions are experimentally verified; the frequency responses of the system are obtained experimentally; the stability and the vibration isolation performance of the system are also evaluated by experiments. This study provides a solution to overcome the unstable problem of QZS systems and extend the limited QZS range, whilst realising QZS characteristics in both vertical and lateral directions, thus broadening the application of QZS systems.

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“…How to realize negative stiffness is a key issue for designing QZS isolators. Negative stiffness can be generated by many ways (Gatti et al, 2022; Heidy et al, 2021; Liu et al, 2021a; Valeev et al, 2015; Yang et al, 2021), such as cam-roller (Li et al, 2020, 2021; Ye et al, 2020; Zhou et al, 2015), magnet (Oyelade, 2020; Wang et al, 2020a; Zhao et al, 2020a; Zhou et al, 2021), coil springs (Liu and Yu, 2018; Wang et al, 2018), elastic beams (Heo and Shim, 2021), air springs (Chen et al, 2021) and bio-inspired limb-like structures (Bian and Jing, 2019; Wang and Jing, 2019). These QZS isolators have mechanical properties of high static and low dynamic stiffness, high loading capacity, and low initial frequency of vibration isolation.…”

Section: Introductionmentioning

confidence: 99%

“…Harmonic excitation with amplitude of 10 mm was numerically simulated to obtain the amplitude frequency response curve of the pneumatic vibration isolation platform in Vo et al (2021). A QZS isolator based on the cam mechanism with user-defined profile was designed with the horizontal length of 138 mm and tested under the excitation amplitude of less than 3 mm Li et al (2021). A bio-inspired polygonal skeleton constituted by the skeleton structure of the cat’s body was proposed to explore its potential application in the suppression of vibration and then tested under the maximum displacement amplitude of 4 mm in Yan et al (2020).…”

Section: Introductionmentioning

confidence: 99%

Enhanced design of the quasi-zero stiffness vibration isolator with three pairs of oblique springs: Theory and experiment

Zhao

Cao

Luo

et al. 2022

Journal of Vibration and Control

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Quasi-zero stiffness vibration isolators have been extensively studied due to superior passive vibration isolation performance. As the quasi-zero stiffness region of the isolators is generally small, the research on their responses to the excitation with high amplitude is currently quite limited. This paper presents an improved design of the quasi-zero stiffness isolator with three pairs of oblique springs to increase the amplitude of the excitation. Theoretical formulations are derived for stiffness and force, and then the influences of three independent parameters on the quasi-zero stiffness region are studied to obtain optimal design parameters. A prototype is fabricated and tested for displacement excitations with amplitudes of 5 mm, 10 mm, and 15 mm in a frequency range of 1.5–10 Hz. The absolute displacement transmissibility of the enhanced quasi-zero stiffness isolator is theoretically and experimentally compared with that of the corresponding linear isolator and that of the previous isolators with three pairs of oblique springs using the same parameter conditions of the loaded mass, the horizontal length of oblique springs, and the vertical spring. The experimental results show that the enhanced design of the quasi-zero stiffness isolator with three pairs of oblique springs can achieve lower displacement transmissibility and deal with the displacement excitation with higher amplitude.

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A quasi-zero-stiffness vibration isolator using a cam mechanism with user-defined profile

Cited by 80 publications

References 36 publications

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

A new magnetorheological quasi-zero stiffness vibration isolation system with large zero stiffness range and highly stable characteristics

Enhanced design of the quasi-zero stiffness vibration isolator with three pairs of oblique springs: Theory and experiment

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