scholarly journals A Digital Mode-Matching Control System Based on Feedback Calibration for a MEMS Gyroscope

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
Bo Yang ◽  
Lei Wu ◽  
Chengfu Lu ◽  
Gang Wang
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Frequency Tuning ◽  
Amplitude Ratio ◽  
Mode Matching ◽  
Sense Mode ◽  
Mems Gyroscope ◽  
Average Analysis ◽  
Simulation Results ◽  
Bias Instability

A digital mode-matching control system based on feedback calibration, where two pilot tones are applied to actuate the sense mode by the robust feedback controller, is presented for a MEMS gyroscope in this paper. A dual-mass decoupled MEMS gyroscope with the integrated electrostatic frequency tuning mechanisms, the quadrature correction electrode, and the feedback electrode is adopted to implement mode-matching control. Compared with the previous mode-matching method of forward excitation calibration, the proposed mode-matching scheme based on feedback calibration has better adaptability to the variation in the frequency of calibration pilot tones and the quality factor of the sense mode. The influences of calibration pilot tone frequency and the amplitude ratio on tuning performance are studied in theory and simulation. The simulation results demonstrate that the tuning error due to the amplitude asymmetry of the sense mode increases with a frequency split between pilot tones and the drive mode and is significantly reduced by the amplitude correction technology of pilot tones. In addition, the influence of key parameters on the stability of the mode-matching system is deduced by using the average analysis method. The MATLAB simulation of the mode-matching control system illustrates that simulation results have a good consistency with theoretical analysis, which verifies the effectiveness of the closed-loop mode-matching control system. The entire mode-matching control system based on a FPGA device is implemented combined with a closed-loop self-excitation drive, closed-loop force feedback control, and quadrature error correction control. Experimental results demonstrate that the mode-matching prototype has a bias instability of 0.63°/h and ARW of 0.0056°/h1/2. Compared with the mode-mismatched MEMS gyroscope, the performances of bias instability and ARW are improved by 3.81 times and 4.20 times, respectively.

scholarly journals A Digital Calibration Technique of MEMS Gyroscope for Closed-Loop Mode-Matching Control

Micromachines ◽  
2019 ◽  
Vol 10 (8) ◽  
pp. 496
Author(s):  
Cheng Li ◽  
Bo Yang ◽  
Xin Guo ◽  
Lei Wu
Keyword(s):  
Theoretical Analysis ◽  
Real Time ◽  
Closed Loop ◽  
Mode Matching ◽  
Loop Analysis ◽  
Calibration Technique ◽  
Mems Gyroscope ◽  
Real Time Mode ◽  
Digital Excitation ◽  
Bias Instability

A digital excitation-calibration technique of dual-mass MEMS gyroscope for closed-loop mode-matching control is presented in this paper. The technique, which takes advantage of the symmetrical amplitude response of MEMS gyroscope, exploits a two-side excitation signal to actuate the sense mode to obtain the corresponding DC tuning voltage. The structural characteristics of dual-mass decoupled MEMS gyroscope and the tuning principle of excitation-calibration technique are introduced firstly. Then, the scheme of digital excitation-calibration system for the real-time mode-matching control is presented. Simultaneously, open-loop analysis and closed-loop analysis are deduced, respectively, to analyze the sources of tuning error and system stability. To verify the validity of the scheme and theoretical analysis, the system model was established by SIMULINK. The simulation results are proved to be consistent with the theoretical analysis, verifying the feasibility of the digital excitation-calibration technique. The control algorithms of the system were implemented with a FPGA device. Experimental results demonstrate that digital excitation-calibration technique can realize mode-matching within 1 s. The prototype with real-time mode-matching control has a bias instability of 0.813 ∘ /h and an ARW (Angular Random Walk) of 0.0117 ∘ / h . Compared to the mode-mismatching condition, the bias instability and ARW are improved by 3.25 and 4.49 times respectively.

scholarly journals A Design Methodology of Digital Control System for MEMS Gyroscope Based on Multi-Objective Parameter Optimization

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 75 ◽  
Author(s):  
Haoyu Gu ◽  
Wei Su ◽  
Baolin Zhao ◽  
Hao Zhou ◽  
Xianxue Liu
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Digital Control System ◽  
Sense Mode ◽  
Loop Control ◽  
Mems Gyroscope ◽  
Closed Loop Control System ◽  
Objective Parameter ◽  
Loop Control System

This paper presents a novel multi-objective parameter optimization method based on the genetic algorithm (GA) and adaptive moment estimation (Adam) algorithm for the design of a closed-loop control system for the sense mode of a Microelectromechanical systems (MEMS) gyroscope. The proposed method can improve the immunity of the control system to fabrication tolerances and external noise. The design procedure starts by deriving a parameterized model of the closed-loop of the sense mode. The loop parameters are then optimized by the GA. Finally, the ensemble of optimized loop parameters is tested by Monte Carlo analysis to obtain a robust optimal solution. Simultaneously, the Adam-least mean square (LMS) demodulator, which is appropriate for the demodulation of very noisy signals, is also presented. Compared with the traditional method, the time consumption of the design process is reduced significantly. The digital control system is implemented by the print circuit board based on embedded Field Programmable Gate Array (FPGA). The experimental results show that the optimized control loop has achieved a better performance, the system bandwidth in open-loop and optimal closed-loop control system is about 23 Hz and 101 Hz, respectively. Compared to a non-optimized closed-loop system, the bias instability reduced from 0.0015°/s to 7.52 × 10−4°/s, the scale factor increased from 17.7 mV/(°/s) to 23 mV/(°/s) and the non-linearity of the scale factor reduced from 0.008452% to 0.006156%.

Constant Palstance Control of Combine Cylinder Based On Nonlinear PID

2012 ◽  
Vol 241-244 ◽  
pp. 1164-1167
Author(s):  
Ming Biao Yu ◽  
De An Zhao ◽  
Jun Zhang
Keyword(s):  
Control System ◽  
Pid Controller ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Control Environment ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Nonlinear Pid Controller ◽  
Simulation Results

Considering that the threshing cylinder palstance system has characteristics of nonlinear, time-delay, what’s more the control environment is very complex and multi-disturbance; this paper presented the method of nonlinear PID to control the cylinder palstance. Firstly, The paper analyzes characteristics of the model of the threshing cylinder palstance system .Then the nonlinear PID controller is designed, and with the threshing cylinder palstance system constitute a closed-loop control system. Finally, simulation results show the effectiveness and feasibility of the proposed method.

Design of 2_DOF Simulation Platform for the Testing of Airborne Laser Communication APT System

2014 ◽  
Vol 989-994 ◽  
pp. 3683-3688
Author(s):  
Li Xin Meng ◽  
Ding Xuan Zhao ◽  
Yang Yang Bai ◽  
Li Zhong Zhang
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Closed Loop ◽  
Laser Communication ◽  
Motion Simulation ◽  
Vector Method ◽  
Kinematics Model ◽  
Airborne Laser ◽  
Model And Simulation ◽  
Simulation Results

Lightweight, flexible motion simulation is the demand of airborne laser communication optical transceive when apply to outside test. A new parallel 2_DOF platform that has the function of azimuth and pitching is put forword based on the analysis of airplane position-pose changes affect the performance airborne laster communication APT system, and the kinematics model is established by using closed-loop vector method. Kinematics model is right through the comparison of mathematical model and simulation results of ADAMS, which provides the reference and basis for the design of control system.

The Research of the Asynchronous Motor Vector Control Arithmetic

2012 ◽  
Vol 157-158 ◽  
pp. 878-881 ◽  
Author(s):  
Fang Gao ◽  
Li Wei
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Vector Control ◽  
Closed Loop ◽  
Induction Motors ◽  
Asynchronous Motor ◽  
Flux Vector ◽  
Simulation Results ◽  
Vector Control System ◽  
Control Principle

This paper is based on analysis of mathematical model of the induction motor and the basis of the asynchronous motor vector control principle puts forward a torque of inner closed-loop speed, flux vector control system of induction motors. Using Matlab/Simulink construct simulation model and the simulation results are analyzed.

Modeling and Simulation of Vector Control System for Asynchronous Motor

2013 ◽  
Vol 397-400 ◽  
pp. 1241-1244
Author(s):  
Jun Rong ◽  
Yue Jiao Ding ◽  
Xi Chen
Keyword(s):  
Control System ◽  
Vector Control ◽  
Closed Loop ◽  
Current Model ◽  
Asynchronous Motor ◽  
Simulation Models ◽  
Rotor Flux ◽  
Simulation Results ◽  
Machine Speed ◽  
Vector Control System

Alternating current (AC) machine speed-adjusting system plays a very important role in our daily life. Firstly, this paper studies the basic principle of vector control system for three-phase asynchronous motor based on the MT coordinate system, and this paper especially gives the calculation principle diagram of the current model for rotor flux. Then this paper establishes the double closed-loop vector control system based on the Matlab/Simulink detail, and gives the simulation results. The simulation results of the double closed-loop vector control system verify the correctness of the simulation models and the principle of vector controlling.

FLUENT/SIMULINK Collaborative Simulation for Missile Separation from Cavity

2012 ◽  
Vol 591-593 ◽  
pp. 1902-1906
Author(s):  
Tong Han ◽  
Shang Qin Tang ◽  
Chang Qiang Huang ◽  
Kang Sheng Dong
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Control Method ◽  
Data File ◽  
Control Model ◽  
Collaborative Simulation ◽  
Coupled Problem ◽  
System A ◽  
Share Data ◽  
Simulation Results

In order to solve the dynamics and kinematics highly coupled problem which exists in missile separating from cavity and in order to acquire accurate trajectory parameters and import control system, a parallel collaborative simulation platform was established. The data interface between FLUENT and SIMULINK was developed by the way of share data file, which use the Journal file of FLUENT and S-function of SIMULINK. The missile’s rudder control model was established. The aerodynamics characters and trajectory characters during missile separating from cavity were simulated under uncontrolled and closed-loop controlled conditions. The simulation results verify the feasibility of parallel collaborative simulation and show that rudder control method can effectively improve the characteristics of missile separating from cavity.

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.

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