Modeling a Mechanical Molecular Spring Isolator with High-Static-Low-Dynamic-Stiffness Properties

A mechanical molecular spring isolator (MMSI) is proposed for the purpose of isolating the low-frequency vibration of a heavy payload. The MMSI is a passive vibration isolation technique mimicking molecular spring isolator characteristics of high-static-low-dynamic stiffness (HSLDS). An MMSI consist...

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Main Authors: Zhanyong Li, Qian Chen, Fengshou Gu, Andrew Ball
Format: Article
Language:English
Published: Hindawi Limited 2020-01-01
Series:Shock and Vibration
Online Access:http://dx.doi.org/10.1155/2020/8853936
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spelling doaj-c876a1aa00a24b8ca2b1b8d171a642fa2020-11-25T03:42:13ZengHindawi LimitedShock and Vibration1070-96221875-92032020-01-01202010.1155/2020/88539368853936Modeling a Mechanical Molecular Spring Isolator with High-Static-Low-Dynamic-Stiffness PropertiesZhanyong Li0Qian Chen1Fengshou Gu2Andrew Ball3State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaState Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaThe Centre for Efficiency and Performance Engineering, University of Huddersfield, Huddersfield, UKThe Centre for Efficiency and Performance Engineering, University of Huddersfield, Huddersfield, UKA mechanical molecular spring isolator (MMSI) is proposed for the purpose of isolating the low-frequency vibration of a heavy payload. The MMSI is a passive vibration isolation technique mimicking molecular spring isolator characteristics of high-static-low-dynamic stiffness (HSLDS). An MMSI consists of a piston-cylinder container filled with the liquid and some hydraulic spring accumulators. The piston would support a lump of mass and be subjected to a specific external vibration excitation force. Those accumulators can get intercommunication by the liquid to produce the transformation from high static stiffness to low dynamic stiffness. The stiffness model of the MMSI with several identical accumulators is established based on the hydrostatic law. After that, some parameters that significantly influence the stiffness characteristics are studied. Results show that the stiffness property of this kind of MMSI demonstrates a piecewise linearity of three segments. It applies the averaging method to acquire amplitude-frequency and phase-frequency relationships of the piecewise linear vibration isolation system. An inevitable jump phenomenon may occur when the exciting force reaches the critical value. The vibration isolation performance is evaluated by energy transmissibility. Finally, an experimental prototype was designed to carry out quasi-static and dynamic experiments to verify the stiffness model and the dynamic properties as an HSLDS vibration isolator.http://dx.doi.org/10.1155/2020/8853936
collection DOAJ
language English
format Article
sources DOAJ
author Zhanyong Li
Qian Chen
Fengshou Gu
Andrew Ball
spellingShingle Zhanyong Li
Qian Chen
Fengshou Gu
Andrew Ball
Modeling a Mechanical Molecular Spring Isolator with High-Static-Low-Dynamic-Stiffness Properties
Shock and Vibration
author_facet Zhanyong Li
Qian Chen
Fengshou Gu
Andrew Ball
author_sort Zhanyong Li
title Modeling a Mechanical Molecular Spring Isolator with High-Static-Low-Dynamic-Stiffness Properties
title_short Modeling a Mechanical Molecular Spring Isolator with High-Static-Low-Dynamic-Stiffness Properties
title_full Modeling a Mechanical Molecular Spring Isolator with High-Static-Low-Dynamic-Stiffness Properties
title_fullStr Modeling a Mechanical Molecular Spring Isolator with High-Static-Low-Dynamic-Stiffness Properties
title_full_unstemmed Modeling a Mechanical Molecular Spring Isolator with High-Static-Low-Dynamic-Stiffness Properties
title_sort modeling a mechanical molecular spring isolator with high-static-low-dynamic-stiffness properties
publisher Hindawi Limited
series Shock and Vibration
issn 1070-9622
1875-9203
publishDate 2020-01-01
description A mechanical molecular spring isolator (MMSI) is proposed for the purpose of isolating the low-frequency vibration of a heavy payload. The MMSI is a passive vibration isolation technique mimicking molecular spring isolator characteristics of high-static-low-dynamic stiffness (HSLDS). An MMSI consists of a piston-cylinder container filled with the liquid and some hydraulic spring accumulators. The piston would support a lump of mass and be subjected to a specific external vibration excitation force. Those accumulators can get intercommunication by the liquid to produce the transformation from high static stiffness to low dynamic stiffness. The stiffness model of the MMSI with several identical accumulators is established based on the hydrostatic law. After that, some parameters that significantly influence the stiffness characteristics are studied. Results show that the stiffness property of this kind of MMSI demonstrates a piecewise linearity of three segments. It applies the averaging method to acquire amplitude-frequency and phase-frequency relationships of the piecewise linear vibration isolation system. An inevitable jump phenomenon may occur when the exciting force reaches the critical value. The vibration isolation performance is evaluated by energy transmissibility. Finally, an experimental prototype was designed to carry out quasi-static and dynamic experiments to verify the stiffness model and the dynamic properties as an HSLDS vibration isolator.
url http://dx.doi.org/10.1155/2020/8853936
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AT qianchen modelingamechanicalmolecularspringisolatorwithhighstaticlowdynamicstiffnessproperties
AT fengshougu modelingamechanicalmolecularspringisolatorwithhighstaticlowdynamicstiffnessproperties
AT andrewball modelingamechanicalmolecularspringisolatorwithhighstaticlowdynamicstiffnessproperties
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