Abstract:

Based on the conception of the discrete modal filter, a force identification model is proposed to emend the classical modal model method. By exciting at the other sites instead of the actual input points that are usually not accessible, identifying the modal parameters of the system and estimating the dynamic loads through computation under both modal and physical coordinates, the errors caused by the usual modification to the structure or the boundary conditions are consequently evitable with this approach. The result of the numerical experiment through a cantilever with impact load acted shows its good accuracy, and the reconstructed force by using the algorithm is consistent with the operational one.

Key words: force identificatio n, modal filter, frequency domain, Frequency Response Funct ions( FRFs), error