To provide a method and a device for a vibration analysis by a single-point excitation experimental property matrix identification method.

This system comprises a process which obtains the coordinate data of a measuring point of an object to be analyzed, a process which carries out single-point excitation of the object to be analyzed and obtains the frequency response function, a process which obtains a constrained expression between property matrix components from the principles of mechanics, such as, a mass matrix of arbitrary elastic structure model can be converted into a rigid mass matrix, the rigid mass matrix serves as a certain special element constitution, and in a state of rigid body motion, the object to be analyzed will not produce distortions or stresses in all the regions, a process which establishes the resonance frequency within identified frequency band, and identifies the mode characteristics. Additionally, a program which includes a process for obtaining the mass matrix and the rigid matrix is stored from a storage medium FD101 to a storage device 129, then the program is performed at a central processing device 128, setting an undamped natural frequency and a natural mode which are obtained from the identification of mode characteristics as the target value.