Abstract
Models for nonlinear vibrations commonly employ polynomial terms that arise from series expansions about an equilibrium point. The analysis of symmetric systems with cubic stiffness terms is very common, and the inclusion of asymmetric quadratic terms is known to modify the effective cubic nonlinearity in weakly nonlinear systems. When using low (second, in this case)-order perturbation methods, the net effect in these cases is found to be a monotonic dependence of the free vibration frequency on the amplitude squared, with a single term that depends on the coefficients of the quadratic and cubic terms. However, in many applications, such a monotonic dependence is not observed, necessitating the use of techniques for strongly nonlinear systems, or the inclusion of higher-order terms and perturbation methods in weakly nonlinear formulations. In either case, the analysis involves very tedious and/or numerical approaches for determining the system response. In the present work, we propose a method that is a hybrid of the methods of averaging and harmonic balance, which provides, with relatively straightforward calculations, good approximations for the free and forced vibration response of weakly nonlinear asymmetric systems. For free vibration, it captures the correct amplitude–frequency dependence, including cases of non-monoticity. The method can also be used to determine the steady-state response of damped, harmonically driven vibrations, including information about stability. The method is described, and general results are obtained for an asymmetric system with up to quintic nonlinear terms. The results are applied to a numerical example and validated using simulations. This approach will be useful for analyzing a variety of system models with polynomial nonlinearities.
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Notes
Note that the exact solution of the free oscillation given in Eq. (11) of Ref. [41] is obtained from an elliptic integral of the conservative system, and is expressed in terms of the total energy of the system \(E_\textrm{tot}\) rather than in terms of the amplitude of oscillation a. However, the relation between these two quantities is simply \(E_\textrm{tot}=\omega _0^2x_\textrm{max}^2/2+\alpha _2x_\textrm{max}^3/3+\alpha _3x_\textrm{max}^4/4\), where \(x_\textrm{max}=a+\sum _{k=0,k\ne 1}^{5}a_k\), and therefore, we can easily compute \(\omega _\textrm{exact}\) in terms of a.
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Funding
This work is supported by BSF under Grant No. 2018041. SWS is also supported by NSF grant CMMI-1662619. OS is also supported by the Pearlstone Center of Aeronautical Engineering Studies at Ben-Gurion University of the Negev. S.R. acknowledges the financial support of the Kreitman school of advanced graduate studies at Ben-Gurion University of the Negev under the Negev-Tzin Scholarship. Just prior to submission, we learned of a concurrent formulation of a very similar technique by Mark Dykman that will be used in a forthcoming paper; discussions with him helped to clarify and expand our understanding of the approach.
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Transient dynamics
Transient dynamics
Here, we demonstrate the main shortcoming of the proposed approach, namely its inability to correctly capture the full transient dynamics. To this end, we numerically integrated both Eq. (2) and Eqs. (8)-(9) with identical initial conditions and compared their transient dynamics. To extract the amplitude a(t) and phase \(\phi (t)\) of the fundamental harmonic from Eq. (2), we heterodyned the numerically obtained signal x(t) with the in-phase and quadrature components at the drive frequency \(\omega \), and passed the mixed signals through a band-pass filter to remove the overtones and DC components [26]. We then use the resulting slowly-varying (with respect to \(\omega ^{-1}\)) quadratures of the fundamental harmonics, u(t) and v(t), to construct the amplitude and phase. The top panel of Fig. 4 depicts this process. The simulation results shown in the bottom panel of Fig. 4 clearly demonstrate that the transient dynamics from our analysis [Eqs. (8)-(9)] are distinctly different from those of the original system [Eq. (2)].
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Shaw, S.W., Rosenberg, S. & Shoshani, O. A hybrid averaging and harmonic balance method for weakly nonlinear asymmetric resonators. Nonlinear Dyn 111, 3969–3979 (2023). https://doi.org/10.1007/s11071-022-08065-3
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DOI: https://doi.org/10.1007/s11071-022-08065-3