Rigid body inertial parameters including mass, mass center, inertia moment and inertia product are essential ones for structural dynamic simulation, performance optimization, finite element analysis, mounting installation position and angle choosing.Here, simulations were performed contrastively for 3 commonly used methods for structural inertial parametric identification based on tested modes including the direct physical parametric identification (DPPI) method, the residual inertia (RI) one or the mass line (ML) one and the modal model (MM) one.The results showed that the 3 methods have advantages and disadvantages in identification accuracy, test conditions and realization difficulty, respectively.Through simulation analysis for a flat plate structure, it was shown that when each method is used singly, the recognition results can be affected by structural support stiffness, noise, coordinate error of measured point, and modal parametric identification results, or some parameters need to be known in advance.Aiming at problems mentioned above, an improved identification method combining DPPI and RI was proposed.Through tests of a certain type train bogie structure, the proposed method was verified in engineering.The result showed that the proposed method is applicable and reliable even in an environment of higher noise; it can reduce the number of measured points but keep the accuracy unchanged.
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