Abstract
To address low-frequency vibration isolation, an issue that engineers often face, this paper first studies the nonlinear energy transfer of a flexible plate, with arbitrary boundary, with the coupling of high-static-low-dynamic-stiffness (HSLDS) isolator. The nonlinear coupled dynamic equation was derived via the Lagrange method, and the improved Fourier series and Rayleigh–Ritz methods provide modal coefficients of the arbitrary boundary flexible plate with nonlinear vibration isolators. The Galerkin and harmonic balance methods approximate the frequency response functions of power flow for the coupled system. The numerical method, via direct integration of the dynamic equation, validates the analytical results of the frequency response functions. In addition, the finite element simulation, used here, validates the analytical results of the mode shapes for flexible plate. The experiment is carried out to validate the isolation performance of the nonlinear vibrator supported on a flexible plate. On these bases, increasing damping and controlling HSLDS can improve the low-frequency isolation efficiency, and nonlinear jumping-phenomena could disappear over a low-frequency range (either frequency overlap or frequency jump). Hence, a properly configured flexible plate could improve the bearing capacity and low-frequency isolation efficiency while avoiding frequency mistune. An explanation for these is offered in the article.
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The data used to support the findings of this study are available from the corresponding author upon request.
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Funding
This study was funded by the National Natural Science Foundation of China (Grant Nos. 11872037, 11872159, and 11572182) and the Innovation Program of Shanghai Municipal Education Commission (Grant No. 2017-01-07-00-09-E00019).
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Appendix
Appendix
Detailed expressions for zi, wi
Compared with the vertical displacement x, α, and β are smaller, and the above equation can be rewritten as,
where, xpi and ypi represent the connected position coordinates in op−xpyp.
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Hao, RB., Lu, ZQ., Ding, H. et al. A nonlinear vibration isolator supported on a flexible plate: analysis and experiment. Nonlinear Dyn 108, 941–958 (2022). https://doi.org/10.1007/s11071-022-07243-7
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DOI: https://doi.org/10.1007/s11071-022-07243-7