Design of 3D Quasi-zero Stiffness Vibration Isolator with High Payload Capacity via Combination of Gas-magnetic-metal Springs

doi:10.3901/JME.2025.05.050

Abstract

Abstract: A three directional(3D) quasi-zero stiffness vibration isolator with high payload capacity via combination of gas-magnetic-metal springs is proposed. The horizontal quasi-zero stiffness is achieved through a tonnage load thrust aerostatic bearing combined with an adjustable leaf spring mechanism. The vertical quasi-zero stiffness is achieved through a high linear annular magnetic negative stiffness mechanism in parallel with the metal spring. Based on the numerical simulation method, the influence of structural and working parameters on the load capacity and stiffness of aerostatic bearing is analyzed, and the optimal design is carried out. Based on the magnetic charge method, a calculation model of negative stiffness is established to analyze the influence of structural parameters of magnets on the magnitude and linearity of negative stiffness and optimize the design. A prototype of high payload 3D quasi-zero stiffness vibration isolator consists of gas-magnetic-metal spring is developed, and a unit test platform is built to verify the tonnage bearing capacity of the aerostatic bearing and the quasi-zero stiffness characteristics of the magnetic negative stiffness mechanism in parallel with the metal spring. The test results show that the load capacity of the developed aerostatic bearing mechanism is greater than 1 200 kg, and the error between the calculation and experimental measurement of load capacity is less than 5%. The error between theoretical and experimental results of the vertical negative magnetic stiffness is less than 7%, and the comprehensive stiffness of the vertical quasi-zero stiffness component is 20.3 N /mm. All indicators meet the design requirements. The proposed vibration isolator can realize tonnage load and 3D quasi-zero stiffness, and is suitable for ultra-low frequency vibration isolation with six degrees of freedom.

Key words: aerostatic bearing, payload capacity, negative stiffness, quasi-zero stiffness, vibration isolation

CLC Number:

TB535

ZHOU Yifan, GAO Ruiqi, WU Mingkai, WU Jiulin, CHEN Xuedong, JIANG Wei. Design of 3D Quasi-zero Stiffness Vibration Isolator with High Payload Capacity via Combination of Gas-magnetic-metal Springs[J]. Journal of Mechanical Engineering, 2025, 61(5): 50-61.

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