Method and system of measuring resonant frequency of loudspeaker vibration component by vibration exciter

The method and system of measuring resonant frequencies of loudspeaker vibration components is presented by using vibration exciter in this paper. The vibration exciter is used as an excitation source to excite the vibration of measured component. The vibration acceleration (including amplitude and phase) of the testing fixture is measured by acceleration sensor in real time and the measured component clamped by the fixture can be ensured to vibrate up and down smoothly in the measured frequency range. Meantime, the vibration displacements of the measured component at different frequencies are measured by the laser displacement sensor to obtain the frequency response curve of the ratio of the vibration acceleration of the measured component to the vibration acceleration of the fixture, and finally to calculate the resonant frequency of the measured component. The experimental results show that the measured frequency response curve is the same as the theoretical one, the repeatability and accuracy of measurement results are good, and the types and range of measuring vibration components are wider.