首页|High-static-low-dynamic stiffness isolator based on an electromagnetic negative stiffness spring with long linear stroke

High-static-low-dynamic stiffness isolator based on an electromagnetic negative stiffness spring with long linear stroke

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Negative stiffness mechanisms can improve low-frequency vibration isolation performance and have been widely used in the vibration isolation of precision equipment.However,the negative stiffness mechanism usually introduces a nonlinear stiffness,resulting in a nonlinear response and worsening the vibration isolation performance,especially under large amplitude vibration.In this paper,an electromagnetic spring with linear negative stiffness(ESLNS)is proposed,in which the antagonistic ampere forces of the energized coils are used to generate negative stiffness within a long linear stroke.The magnetic field distribution is improved through the design of the magnetic circuit,thereby increasing the stiffness generation efficiency.The stiffness can be adjusted bidirectionally by current within the range of positive and negative stiffness.An electromagnetic stiffness model was established based on the equivalent magnetic circuit method.Experimental measurements verified the accuracy of the model and proved the linearity of the electromagnetic spring.A vibration isolator with high static and low dynamic stiffness(HSLDS)based on the ESLNS is designed and tested.The experimental results prove that the introduction of the ESLNS can effectively expand the isolation frequency band without changing the equilibrium position.Moreover,the vibration isolator with ESLNS does not produce nonlinear response.The proposed electromagnetic spring with linear negative stiffness extends the application range of HSLDS isolators to a large amplitude vibration environment.

linear negative stiffness mechanismlow-frequency vibration isolationelectromagnetic springvibration control

YUAN ShuJin、WU YaJun、SONG DaiPing、PU HuaYan、MOU LiSheng、HOU Lei、ZHAO JingLei、LI XuePing、LUO Jun、WU Jie、HUANG XiaoXu

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State Key Laboratory of Mechanical Transmissions,Chongqing University Chongqing 400044,China

China Aerodynamics Research and Development Center Mianyang 621000,China

College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

国家自然科学基金国家自然科学基金国家自然科学基金中国博士后科学基金Program of Shanghai Academic/Technology Research Leader重庆市自然科学基金

6232530262203076621030652021M70058421XD1421400cstc2020jcyjzdxmX0014

2024

10.1007/s11431-023-2586-y

中国科学:技术科学(英文版)
中国科学院

中国科学:技术科学(英文版)

CSTPCDEI
影响因子：1.056
ISSN：1674-7321
年,卷(期)：2024.67(3)
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