Closed-Loop Control and Output Stability Analysis of a Micromechanical Resonant Accelerometer
In this study, a dynamic equation for a micromechanical resonant accelerometer based on electrostatic stiffness is analyzed, and the parameters influencing sensitivity are obtained. The sensitivity can be increased by increasing the detection proof mass and the area facing the detection capacitor pl...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-08-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/13/8/1281 |
| _version_ | 1797408827957575680 |
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| author | Heng Liu Yu Zhang Jiale Wu |
| author_facet | Heng Liu Yu Zhang Jiale Wu |
| author_sort | Heng Liu |
| collection | DOAJ |
| description | In this study, a dynamic equation for a micromechanical resonant accelerometer based on electrostatic stiffness is analyzed, and the parameters influencing sensitivity are obtained. The sensitivity can be increased by increasing the detection proof mass and the area facing the detection capacitor plate and by decreasing the stiffness of the fold beams and the initial distance between the plate capacitors. Sensitivity is also related to the detection voltage: the larger the detection voltage, the greater the sensitivity. The dynamic equation of the closed-loop self-excited drive of the accelerometer is established, and the steady-state equilibrium point of the vibration amplitude and the stability condition are obtained using the average period method. Under the constraint conditions of the PI controller, when the loading acceleration changes, the vibration amplitude is related to the reference voltage and the pre-conversion coefficient of the interface circuit and has nothing to do with the quality factor. When the loading voltage is 2 V, the sensitivity is 321 Hz/g. Three Allan variance analysis methods are used to obtain the frequency deviation of 0.04 Hz and the amplitude deviation of 0.06 mVwithin 30 min at room temperature. When the temperature error in the incubator is ±0.01 °C, the frequency deviation decreases to 0.02 Hz, and the resolution is 56ug. The fully overlapping Allan variance analysis method (FOAV) requires a large amount of data and takes a long time to implement but has the most accurate stabilityof the three methods. |
| first_indexed | 2024-03-09T04:04:15Z |
| format | Article |
| id | doaj.art-16981fac92b94ac08d815865cf2ede6a |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-09T04:04:15Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-16981fac92b94ac08d815865cf2ede6a2023-12-03T14:08:10ZengMDPI AGMicromachines2072-666X2022-08-01138128110.3390/mi13081281Closed-Loop Control and Output Stability Analysis of a Micromechanical Resonant AccelerometerHeng Liu0Yu Zhang1Jiale Wu2School of Electronic & Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, ChinaSchool of Electronic & Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, ChinaSchool of Electronic & Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, ChinaIn this study, a dynamic equation for a micromechanical resonant accelerometer based on electrostatic stiffness is analyzed, and the parameters influencing sensitivity are obtained. The sensitivity can be increased by increasing the detection proof mass and the area facing the detection capacitor plate and by decreasing the stiffness of the fold beams and the initial distance between the plate capacitors. Sensitivity is also related to the detection voltage: the larger the detection voltage, the greater the sensitivity. The dynamic equation of the closed-loop self-excited drive of the accelerometer is established, and the steady-state equilibrium point of the vibration amplitude and the stability condition are obtained using the average period method. Under the constraint conditions of the PI controller, when the loading acceleration changes, the vibration amplitude is related to the reference voltage and the pre-conversion coefficient of the interface circuit and has nothing to do with the quality factor. When the loading voltage is 2 V, the sensitivity is 321 Hz/g. Three Allan variance analysis methods are used to obtain the frequency deviation of 0.04 Hz and the amplitude deviation of 0.06 mVwithin 30 min at room temperature. When the temperature error in the incubator is ±0.01 °C, the frequency deviation decreases to 0.02 Hz, and the resolution is 56ug. The fully overlapping Allan variance analysis method (FOAV) requires a large amount of data and takes a long time to implement but has the most accurate stabilityof the three methods.https://www.mdpi.com/2072-666X/13/8/1281resonant accelerometersensitivityself-excited oscillationfrequency stabilityAllan variance |
| spellingShingle | Heng Liu Yu Zhang Jiale Wu Closed-Loop Control and Output Stability Analysis of a Micromechanical Resonant Accelerometer Micromachines resonant accelerometer sensitivity self-excited oscillation frequency stability Allan variance |
| title | Closed-Loop Control and Output Stability Analysis of a Micromechanical Resonant Accelerometer |
| title_full | Closed-Loop Control and Output Stability Analysis of a Micromechanical Resonant Accelerometer |
| title_fullStr | Closed-Loop Control and Output Stability Analysis of a Micromechanical Resonant Accelerometer |
| title_full_unstemmed | Closed-Loop Control and Output Stability Analysis of a Micromechanical Resonant Accelerometer |
| title_short | Closed-Loop Control and Output Stability Analysis of a Micromechanical Resonant Accelerometer |
| title_sort | closed loop control and output stability analysis of a micromechanical resonant accelerometer |
| topic | resonant accelerometer sensitivity self-excited oscillation frequency stability Allan variance |
| url | https://www.mdpi.com/2072-666X/13/8/1281 |
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