Study of dynamic load identification under unknown initial conditions

Abstract Dynamic load identification belongs to the second inverse problem of structural dynamics, i.e. inversion history in real state by collecting measured data vibration. Some traditional dynamic methods do not consider initial conditions, conditions structure are assumed be zero, however, is always at rest during process vibration response, which leads a large error between identified force and actual using methods. Since measurement very difficult, order solve influence brought process, this paper proposes method based on sparse regularization identify under unknown conditions. Firstly, represented basis functions, response divided into two parts: forced caused free finally used ill-conditioned equation. The experimental simulation results also further verify applicability robustness proposed dealing with