In this paper

neural network technology is used to solve the position and the extent of of damaged frame structure.Vibrate modal analysis technology is used to calculate the dynamic parameter of frame structure and combined structure

draw a series of frequency and vertical displacement and horizontal displacement

the relation of this number is used to train as network sample.Use this number to numerically simulated all kinds of one damage identify and two damage identify in a combined structure and a frame structure

draw some conclusion

how to choose the best number of implication layers and how to optimize mode of vibration vector approach and it was feasible that use low order frequency and certain mode of vibration or their derived quantity incorporation came by way of structural impair position

extent of damage.