Nonlinear system identification of mechanical interfaces based on wave propagation

Abstract eng:
We study stress wave propagation in an impulsively forced split Hopkinson bar system with a frictional interface. By first considering only the primary-wave transmission and reflection, we reduced the problem to a first-order, strongly nonlinear ordinary differential equation. An Iwan element is chosen to model the frictional interface. The primary-wave propagation model is used to identify the Iwan parameters by maximizing the R-squared value between the experiment and simulation results. Using the optimized Iwan parameters, a high-order finite element model is used to simulate multiple transmissions and reflections across the interface. The results demonstrate that the primary-wave propagation model can be used for nonlinear system identification at a lower computational cost compared to higher-order models.

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