Optimal Hilbert transform parameter identification of bistable structures

Q Liu, Y Zhang, Z Hou, Y Qiao, J Cao, Y Lei - Nonlinear Dynamics, 2023 - Springer
Nonlinear Dynamics, 2023Springer
Nonlinear bistable structures have received significant attention in the field of energy
harvesting and vibration absorption. Obtaining their precise nonlinear restoring force is of
significance to predict and enhance the system's performance. However, it is difficult to
measure their nonlinear restoring force in experiments due to the distinct characteristic of
snap-through. Moreover, the traditional Hilbert transform-based method may have
insufficient identification accuracy or even be incapable because numerical integration or …
Abstract
Nonlinear bistable structures have received significant attention in the field of energy harvesting and vibration absorption. Obtaining their precise nonlinear restoring force is of significance to predict and enhance the system's performance. However, it is difficult to measure their nonlinear restoring force in experiments due to the distinct characteristic of snap-through. Moreover, the traditional Hilbert transform-based method may have insufficient identification accuracy or even be incapable because numerical integration or differentiation procedure is sensitive to noise disturbance. To address these issues, an optimal Hilbert transform parameter identification is proposed to precisely estimate the parameters in the bistable dynamic equation. The Hilbert transform interval estimation of mass, damping and nonlinear restoring force coefficients are derived for obtaining the reasonable range of identified parameters. Furthermore, an optimization fitness function is established to obtain the optimal value of nonlinear parameters in bistable structures. Numerical simulation of an asymmetric bistable dynamic equation shows that the proposed method exhibits an NMSE value of 2.52% for free vibration and 1.64% for forced periodic oscillation under 20 dB noise level. Besides, the damping effects on identification results are discussed. Experimental measurements of a magnetic coupled bistable cantilever beam under different conditions are performed to identify the nonlinear system parameters. Results indicate that the proposed method can effectively identify the nonlinear bistable structures with an average NMSE value of 8.23% for free vibration and 6.39% for forced periodic responses, respectively.
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