The stiffness of elastomeric diaphragm in pneumatic springs

The design of pneumatic springs applied in precision vibration isolation platforms requires an accurate mathematical model. Many validation experiments have shown that neglecting the effect of the diaphragm on the response of a isolator can lead to a significant error between the observed and predic...

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Bibliographic Details
Published in:Journal of physics. Conference series 2024-06, Vol.2784 (1), p.12018
Main Authors: Bai, Yumei, Che, Jixing, Wu, Mingkai, Wu, Jiulin, Jiang, Wei
Format: Article
Language:English
Subjects:
Composite materials
Design standards
Diaphragms (mechanics)
Elastic anisotropy
Elastomers
Springs (elastic)
Stiffness
Storage modulus
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Summary:The design of pneumatic springs applied in precision vibration isolation platforms requires an accurate mathematical model. Many validation experiments have shown that neglecting the effect of the diaphragm on the response of a isolator can lead to a significant error between the observed and predicted behavior. This paper modifies the standard pneumatic spring model by considering the effects of the diaphragm on stiffness. A theoretical model for diaphragm stiffness is presented. The model equates the inner and outer rings of the diaphragm into two segments of composite material subjected to unidirectional stretching. The elastic modulus and stiffness of each part of anisotropic materials were obtained using the theory of composite mechanics, combined with the working conditions of the diaphragm. Finally, the dynamic stiffness experimental platform was built to verify theoretical model. The result indicates that considering the stiffness of elastomeric diaphragm, the error is reduced from 27.33% to 7.5%.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2784/1/012018