scholarly journals Effect of Uneven Electrostatic Forces on the Dynamic Characteristics of Capacitive Hemispherical Resonator Gyroscopes

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1291 ◽  
Author(s):  
Zeyuan Xu ◽  
Guoxing Yi ◽  
Meng Er ◽  
Chao Huang
Keyword(s):  
Scale Factor ◽  
Harmonic Amplitude ◽  
Electrostatic Forces ◽  
Zero Bias ◽  
Output Error ◽  
Vibratory Gyroscope ◽  
Influence Mechanism ◽  
Hemispherical Resonator ◽  
Order Of Magnitude ◽  
Modification Rate

The hemispherical resonator gyroscope (HRG) is a typical capacitive Coriolis vibratory gyroscope whose performance is inevitably influenced by the uneven electrostatic forces caused by the uneven excitation capacitance gap between the resonator and outer base. First, the mechanism of uneven electrostatic forces due to the significantly uneven capacitance gap in that the non-uniformity of the electrostatic forces can cause irregular deformation of the resonator and further affect the performance and precision of the HRG, was analyzed. According to the analyzed influence mechanism, the dynamic output error model of the HRG was established. In this work, the effect of the first four harmonics of the uneven capacitance gap on the HRG was investigated. It turns out that the zero bias and output error, caused by the first harmonic that dominates mainly the amplitude of the uneven capacitance gap, increase approximately linearly with the increase of the amplitude, and periodically vary with the increase of the phase. The effect of the other three harmonics follows the same law, but their amplitudes are one order of magnitude smaller than that of the first one, thus their effects on the HRG can be neglected. The effect of uneven electrostatic forces caused by the first harmonic on the scale factor is that its nonlinearity increases approximately linearly with the increase of the harmonic amplitude, which was analyzed in depth. Considering comprehensively the zero bias, the modification rate of output error, and scale factor nonlinearity, the tolerance towards the uneven excitation capacitance gap was obtained.

scholarly journals Damping Asymmetry Trimming Based on the Resistance Heat Dissipation for Coriolis Vibratory Gyroscope in Whole-Angle Mode

Micromachines ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 945
Author(s):  
Kechen Guo ◽  
Yulie Wu ◽  
Yongmeng Zhang ◽  
Jiangkun Sun ◽  
Dingbang Xiao ◽  
...  
Keyword(s):  
Parallel Plate ◽  
Heat Dissipation ◽  
Scale Factor ◽  
Control Force ◽  
Rate Measurement ◽  
Symmetrical Structure ◽  
Tuning Method ◽  
Vibratory Gyroscope ◽  
Hemispherical Resonator ◽  
The One

Damping asymmetry is one of the most important factors that determines the performance of Coriolis Vibratory Gyroscope. In this paper, a novel damping tuning method for the resonator with parallel plate capacitors is presented. This damping tuning method is based on resistance heat dissipation and the tuning effect is characterized by the control force in Whole-Angle mode. As the damping tuning and stiffness tuning in the resonator with parallel plate capacitors are coupled with each other, a corresponding tuning system is designed. To verify the tuning effects, experiments are conducted on a hemispherical resonator gyroscope with Whole-Angle mode. The damping tuning theories is demonstrated by the testing results and 87% of the damping asymmetry is reduced by this tuning method with a cost of 3% decaying time. Furthermore, the angle-dependent drift in rate measurement after tuning is only 15.6% of the one without tuning and the scale factor nonlinearity decreases from 5.49 ppm to 2.66 ppm. The method can be further applied on the damping tuning in other resonators with symmetrical structure.

scholarly journals The control algorithm of whole angle mode for HRG based on the vector composition

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Wanliang Zhao ◽  
Yuxiang Cheng ◽  
Shaoliang Li ◽  
Lijun Song
Keyword(s):  
Control Algorithm ◽  
High Reliability ◽  
Energy Transition ◽  
Life Time ◽  
Mathematics Model ◽  
Operating Modes ◽  
Hemispherical Resonator ◽  
Order Of Magnitude ◽  
Electrostatic Control ◽  
Space Launcher

AbstractThe Hemispherical Resonator Gyroscope (HRG) has many advantages such as high precision, high reliability and long life-time, it is widely used in the space-launcher and the satellites. The HRG has been mechanized to operate in the distinct operating modes, the Force to Rebalanced (FTR) mode and the Whole Angle (WA) mode. In the paper, different from the traditional control algorithm is based on average methods which usually used for the WA mode, a new electrostatic control algorithm is presented, which based on the vector composition and decomposition method to control the equivalent drive force in order to track the phase of the standing wave. The mathematics model and the control algorithm are presented in the paper, and the hardware experimental circuit system is implemented, the HRG has a range of more than 300°/s with the linearity of 40 ppm. Meanwhile, the energy transition efficiency increases by an order of magnitude.

scholarly journals Highly efficient self-powered perovskite photodiode with an electron-blocking hole-transport NiOx layer

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Amir Muhammad Afzal ◽  
In-Gon Bae ◽  
Yushika Aggarwal ◽  
Jaewoo Park ◽  
Hye-Ryeon Jeong ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Bias Voltage ◽  
High Performance ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Zero Bias ◽  
Decay Times ◽  
Order Of Magnitude ◽  
Self Powered

AbstractHybrid organic–inorganic perovskite materials provide noteworthy compact systems that could offer ground-breaking architectures for dynamic operations and advanced engineering in high-performance energy-harvesting optoelectronic devices. Here, we demonstrate a highly effective self-powered perovskite-based photodiode with an electron-blocking hole-transport layer (NiOx). A high value of responsivity (R = 360 mA W−1) with good detectivity (D = 2.1 × 1011 Jones) and external quantum efficiency (EQE = 76.5%) is achieved due to the excellent interface quality and suppression of the dark current at zero bias voltage owing to the NiOx layer, providing outcomes one order of magnitude higher than values currently in the literature. Meanwhile, the value of R is progressively increased to 428 mA W−1 with D = 3.6 × 1011 Jones and EQE = 77% at a bias voltage of − 1.0 V. With a diode model, we also attained a high value of the built-in potential with the NiOx layer, which is a direct signature of the improvement of the charge-selecting characteristics of the NiOx layer. We also observed fast rise and decay times of approximately 0.9 and 1.8 ms, respectively, at zero bias voltage. Hence, these astonishing results based on the perovskite active layer together with the charge-selective NiOx layer provide a platform on which to realise high-performance self-powered photodiode as well as energy-harvesting devices in the field of optoelectronics.

scholarly journals The Control Algorithm of Whole Angle Mode for HRG Based on the Vector Composition

2020 ◽  
Author(s):  
Wanliang Zhao ◽  
Yuxiang Cheng ◽  
Shaoliang Li ◽  
Lijun Song
Keyword(s):  
Control Algorithm ◽  
High Reliability ◽  
Energy Transition ◽  
Life Time ◽  
Mathematics Model ◽  
Operating Modes ◽  
Hemispherical Resonator ◽  
Order Of Magnitude ◽  
Electrostatic Control ◽  
Space Launcher

Abstract The Hemispherical Resonator Gyroscope (HRG) has many advantages such as high precision, high reliability and long life-time, it is widely used in the space-launcher and the satellites. The HRG has been mechanized to operate in two the distinct operating modes, the Force to Rebalanced (FTR) mode and the Whole Angle (WA) mode. Different from the traditional control algorithm is based on average methods which usually used for WA mode, in the paper, a new electrostatic control algorithm is presented, which based on the vector composition and decomposition method to control the equivalent drive force in order to track the phase of the standing wave. The mathematics model and the control algorithm are presented in the paper. And the hardware experimental circuit system is implemented, the HRG has a range of more than 300°/s with the linearity of 40 ppm. Meanwhile, the energy transition efficiency increases by an order of magnitude, rather than the average methods.

Analysis of compensation for a g-sensitivity scale-factor error for a MEMS vibratory gyroscope

2015 ◽  
Vol 25 (11) ◽  
pp. 115006 ◽  
Author(s):  
Byung Su Park ◽  
KyungJun Han ◽  
SangWoo Lee ◽  
MyeongJong Yu
Keyword(s):  
Scale Factor ◽  
Vibratory Gyroscope

The Simulation Analysis of Temperature Effects on System Performance of Silicon Micro-Gyroscope

2014 ◽  
Vol 529 ◽  
pp. 375-378
Author(s):  
Yun Peng Deng ◽  
Bo Yang ◽  
Xing Jun Wang ◽  
Bo Dai
Keyword(s):  
System Performance ◽  
Closed Loop ◽  
Simulation Analysis ◽  
Simulation Models ◽  
Temperature Characteristic ◽  
Open Loop ◽  
Scale Factor ◽  
Drive System ◽  
Zero Bias ◽  
Relative Change

The effects of temperature variation on the system performance is discussed in this paper. The temperature characteristic of the natural frequency and quality factor is analyzed theoretically firstly. Then the simulation models of the open-loop drive system, the closed-loop drive system, the closed-loop sense system and the quadrature correction system are constructed to simulate the temperature characteristic of the scale factor and zero bias. The simulation results demonstrate the relative change of the scale factor in the closed-loop drive system, that is 1.35%, almost decreases by 67 times relative to the open-loop drive system and the variation of the zero bias in the closed-loop drive system, that is 0.2789°/s, almost decreases by 364 times relative to the open-loop drive system. At the same time, the relative change of the scale factor in the closed-loop sense system, that is 0.000029%, almost decreases by 46551 times relative to the closed-loop drive system. The variation of the zero bias in the closed-loop sense system, that is 1.2×10-11°/s, almost decreases by 2.3×1010 times relative to the closed-loop drive system, which shows the proposed method is feasible and correct.

Comparative Study of Three Output-Error Multi-Input Multi-Output Identification Methods

2020 ◽  
Author(s):  
Renato A. L. de Andrade ◽  
Péricles R. Barros
Keyword(s):  
Least Squares ◽  
Mimo Systems ◽  
Single Input Single Output ◽  
Identification Methods ◽  
Output Error ◽  
Single Output ◽  
Regression Algorithms ◽  
Intrinsic Complexity ◽  
Order Of Magnitude ◽  
Single Input

Multi-input multi-output (MIMO) systems have been a major concern for decades. However, due to the intrinsic complexity raised by the process interactions and optimization issues, MIMO approaches have not been developed as extensively as the single-input single-output ones. Recently, nevertheless, several algorithms have been proposed to address this problem, most of them based on recursive algorithms and many dependent on the assumption that the transfer function denominator polynomials are the same for all subsystems. In this article, an iterative least-squares-based algorithm, a pseudolinear regression and a Gauss-Newton optimization-based algorithm are proposed to provide a continuous-time output-error multi-input single-output model by means of iterative strategies. The numerical simulations indicate the iterative least-squares-based and the pseudo-linear regression algorithms have similar performances and generate more accurate and precise estimates than the Gauss-Newton one, which presented averages and standard deviations of the parameters ranging from twice as large to one order of magnitude higher than those of the other two algorithms.

A Sub 0.8 Degree per Hour Mode-Matching MEMS Vibratory Gyroscope with Closed Loop Control for the Sense Mode

2013 ◽  
Vol 562-565 ◽  
pp. 260-264
Author(s):  
Chun Hua He ◽  
Qian Cheng Zhao ◽  
Da Chuan Liu ◽  
Zhen Chuan Yang ◽  
Gui Zhen Yan
Keyword(s):  
Closed Loop ◽  
Open Loop ◽  
Closed Loop Control ◽  
Mode Matching ◽  
Sense Mode ◽  
Loop Control ◽  
Vibratory Gyroscope ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Order Of Magnitude

A detailed analysis about the nonlinearity of a mode-matching MEMS vibratory gyroscope is presented in this paper, then closed loop control for the sense mode is adopted to improved the performances. Experimental results figure out that the mode-matching gyroscope with closed loop controlled sense mode achieves a scale factor of 65mV/deg/s with nonlinearity of 0.05% and asymmetry of 0.1%, and a bias instability of 0.77deg/h, while they are 60mV/deg/s, 1%, 4.6% and 9.8deg/h in the open loop controlled sense mode system, respectively. These performances can be improved by more than one order of magnitude in the closed loop control system.

scholarly journals Automatic Frequency Tuning Technology for Dual-Mass MEMS Gyroscope Based on a Quadrature Modulation Signal

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 511 ◽  
Author(s):  
Jia Jia ◽  
Xukai Ding ◽  
Yang Gao ◽  
Hongsheng Li
Keyword(s):  
Microelectromechanical Systems ◽  
Frequency Tuning ◽  
Open Loop ◽  
Scale Factor ◽  
Quadrature Modulation ◽  
Automatic Frequency ◽  
Zero Bias ◽  
Static Test ◽  
Loop Detection ◽  
Modulation Signal

In order to eliminate the frequency mismatch of MEMS (Microelectromechanical Systems) gyroscopes, this paper proposes a frequency tuning technology based on a quadrature modulation signal. A sinusoidal signal having a frequency greater the gyroscope operating bandwidth is applied to the quadrature stiffness correction combs, and the modulation signal containing the frequency split information is then excited at the gyroscope output. The effects of quadrature correction combs and frequency tuning combs on the resonant frequency of gyroscope are analyzed. The tuning principle based on low frequency input excitation is analyzed, and the tuning system adopting this principle is designed and simulated. The experiments are arranged to verify the theoretical analysis. The wide temperature range test (-20 ∘ C –60 ∘ C ) demonstrates the reliability of the tuning system with a maximum mismatch frequency of less than 0.3 Hz. The scale factor test and static test were carried out at three temperature conditions (−20 ∘ C, room temperature, 60 ∘ C), and the scale factor, zero-bias instability, and angle random walk are improved. Moreover, the closed-loop detection method is adopted, which improves the scale factor nonlinearity and bandwidth under the premise of maintaining the same static performances compared with the open-loop detection by tuning.

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