一种采用激振器激励的扬声器振动部件共振频率测量方法及系统

提出了一种采用激振器激励方式的扬声器振动部件共振频率测量方法及系统。采用激振器作为激励被测部件振动的激励源，并通过加速度传感器实时检测夹具的振动加速度（包括幅度和相位），以确保被夹具夹持住的被测部件在测量频率范围内上下平稳振动；通过激光位移传感器测量被测部件在不同频率点振动时的振动位移，可得到被测部件振动的频率响应（被测部件振动加速度和夹具振动加速度的比值的频率响应）；根据该频率响应进行计算最后可得到被测部件的共振频率。实验结果表明，实测频率响应的曲线与理论分析相一致，测量结果的可重复性和准确性良好，可测量的振动部件的种类和范围更广。

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.