Abstract: A method to determine the resonant frequency of forced and damped vibrating system is introduced.After combining the amplitude-frequency with the phase- frequency characteristics of the vibrating system,we enhance the response contrast ratio and minimize the jamming signal of the vibrating system so as to get higher accuracy resonant frequency. This method can be used to other systems which have similar relationship of amplitude- frequency and phase-frequency.

Key words: resonance frequency, correlation detection method, interference signal