Many electronic boards or systems exhibit nonlinear behaviors during shock or vibration tests. One of the challenges for dynamics analysis of electronic boards or systems is to deal with these nonlinearities. In order to solve the nonlinear problem, the nonlinearities need to be revealed and characterized and their effects understood. This paper demonstrates the methods in identifying the nonlinearities and supported with empirical tests. Shock, random vibration and static bending were used to reveal the board system nonlinearities. The empirical results provided direction to update shock FE models.

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