Quality factor estimates of resonant beams with nonlinear vibrations

YAN Bin; LIU Yunfeng; DONG Jingxin

doi:10.16511/j.cnki.qhdxxb.2016.22.038

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Journal of Tsinghua University(Science and Technology) ›› 2016, Vol. 56 ›› Issue (10) : 1055-1060. DOI: 10.16511/j.cnki.qhdxxb.2016.22.038

Quality factor estimates of resonant beams with nonlinear vibrations

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Abstract

Vacuum resonant accelerometers have nonlinear sweeping frequency response, so the regular method cannot be used to measure the quality factor. A nonlinear model of the resonant beam is used here to monitor the effect of the vacuum package. The system calculates the quality factor through fitting the sweeping frequency data for the nonlinear vibrations. Tests on a resonant accelerometer verify the consistency and accuracy of the method. The measured quality factors of the accelerometers are all above 2×10⁵. In addition, this method is also used to measure the relationship between the pressure and the quality factor, which indicates that the pressure inside the vacuum package is about 0.1 Pa. The temperature tests and long-term monitoring tests show the reliability of the vacuum packaging.

Key words

resonant accelerometer / nonlinear vibration / quality factor / vacuum package

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YAN Bin, LIU Yunfeng, DONG Jingxin. Quality factor estimates of resonant beams with nonlinear vibrations[J]. Journal of Tsinghua University(Science and Technology). 2016, 56(10): 1055-1060 https://doi.org/10.16511/j.cnki.qhdxxb.2016.22.038

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