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Dynamic study of a bounded cantilevered nonlinear spring for vibration reduction applications: a comparative study

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Abstract

The objective of this study is to develop, simulate and verify experimentally a model of a nonlinear spring, based on the principle of a cantilevered beam with a mass on its tip, and whose overall lateral vibration is constrained by a specially shaped rigid boundary. The focus here is the use of this spring for vibration reduction applications. The modeling approach uses concepts of plane kinematics of rigid bodies, combined with quasi-static analysis to develop suitable equations of motion for a base-excited spring with a ninth-order geometric nonlinearity. In addition, a parametric identification procedure is implemented for obtaining the required coefficients for computational simulations. An approximated analytical solution to the model is completed with the aid of the method of harmonic balance and its stability is assessed through Floquet theory. Finally, the model is experimentally verified, with the use of two specimens, fabricated specifically for this study. The model, simulations and experimental measurements show the hardening and broadband behavior of the nonlinear spring.

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Acknowledgements

The authors would like to express their appreciation to the National Secretariat of Science, Technology, and Innovation, of the Government of Ecuador, and The Graduate School at Purdue University, for their financial support.

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Appendix

Appendix

The selection of a ninth-order polynomial of the form \(P(u) = a_1 u+a_9 u^9\) as the form of the nonlinear characteristic of the device was made based on analyzing several possible fit options to the theoretical deformation of the beam for a set force, using a discretization of 600 points for the fit.

Fig. 14
figure 14

Linear and cubic fit

Fig. 15
figure 15

Full ninth-order polynomial fit

Fig. 16
figure 16

Linear and ninth-order fit

  1. 1.

    The classic cubic shape, very common in other types of NES, did not fit the special property of the beam NES to have a quasi-asymptotic stiffness toward the edge of the boundary. Figure 14 shows a cubic fit case. The goodness of fit corresponding to this case was found to be \(R^2 = 0.952\), for a root mean-squared error of \(\mathrm {RMSE} = 5.31\%\)

  2. 2.

    A high-order full polynomial was also tested as an option, including more terms to capture as most of the behavior as possible. In this case, a better fit was obtained, but at the cost of having a wavy behavior (see Fig. 15) that would produce unwanted dynamics in the model. The goodness of fit for this case was increased to an \(R^2 = 0.9982\), and an \(\mathrm {RMSE} = 1.23\%\).

  3. 3.

    The final option analyzed was a pure ninth-order function with a linear component. This case offered a reasonably well fit curve, without compromising the smoothness or continuity. The goodness-of-fit parameters were found to be fairly close to those on the full polynomial, \(R^2 = 0.9916\), and an \(\mathrm {RMSE} = 2.65\%\). This fit is shown in Fig. 16. Additionally, this option resulted in a simplified derivation of the harmonic balance method for obtaining the approximate exact solution of the EOM of the system, thus providing a balance between computational efficiency and result accuracy.

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Silva, C.E., Gibert, J.M., Maghareh, A. et al. Dynamic study of a bounded cantilevered nonlinear spring for vibration reduction applications: a comparative study. Nonlinear Dyn 101, 893–909 (2020). https://doi.org/10.1007/s11071-020-05852-8

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