Limiting performance of a new nonlinear spring

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (23) : 1-7.

CHEN Zhengqing1, ZENG Jiongkun1, PEI Bingzhi2, ZHANG Menzhe3

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Abstract

Flexible structures with low damping may have large-amplitude displacements under excitation of external loads, which cause damages of the components, and even structural failure in severe cases.Here, the buffering and limiting performance of a bi-directional nonlinear spring restrictor for flexible structures was studied, and the theoretical calculation formula for force and deformation of the device was derived and verified with pseudo-static tests.Finally, based on a single-DOF main structure model, buffer limit performances of linear and nonlinear restrictors were compared and analyzed, and effects of the nonlinear spring stiffness on its performance were studied.Results showed that the calculated results with the theoretical calculation formula of the nonlinear spring do not agree well with test ones, then a theoretical calculation formula considering initial displacement is proposed; when the initial displacement is smaller, both two theoretical calculation formulas can be a theoretical basis for practical application; the nonlinear spring restrictor has characteristics of quasi-zero stiffness, when it starts to work, it can reduce the main structure’s motion speed more gently; under random loads, the nonlinear spring has the same limiting capacity as that of a linear spring, and can significantly reduce recoil action on structure; the reasonably setting of its stiffness not only can effectively control displacements of the main structure, but also reduce its recoil force on the main structure.

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structural vibration / nonlinear spring / loading test / position limiting performance / recoil force

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CHEN Zhengqing1, ZENG Jiongkun1, PEI Bingzhi2, ZHANG Menzhe3. Limiting performance of a new nonlinear spring[J]. Journal of Vibration and Shock, 2020, 39(23): 1-7

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