石英撓性加速度計擺片微運動仿真與狀態(tài)分析研究
[Abstract]:Quartz flexible accelerometer is a classical high precision mechanical pendulum accelerometer, especially as an inertial navigation device, especially in the field of aerospace. According to the current research situation at home and abroad, the imbalance of pendulum is a problem which is easy to appear in its production and application, which greatly affects the quality of its manufacture and application. Therefore, it is very important to study the identification and analysis of quartz flexible accelerometer pendulum. Therefore, this paper starts with improving the precision and stability of quartz flexible accelerometer, and combines many effective signal processing and analysis methods to help improve its performance quality. Quartz pendulum is an important component of accelerometer. The micro-motion simulation analysis of accelerometer quartz pendulum can obtain the technical means and ways to improve the production quality of quartz flexible accelerometer. Starting with the physical model of the accelerometer quartz pendulum, on the one hand, the force analysis of the accelerometer quartz pendulum is made, which reflects more vividly the movement mode of the quartz pendulum, and plays an auxiliary role in analyzing the working state of the accelerometer quartz pendulum; on the other hand, The static calculation and modal analysis of quartz pendulum, a key component of pendulum accelerometer, are carried out by finite element method. The stress field and deformation field of quartz pendulum structure are displayed intuitively, and the natural frequency and matrix of each order are obtained. Through the simulation analysis, the finite element analysis method can help to improve the performance of accelerometer, which has good reference significance in practice. High precision calibration parameters can be used to accurately evaluate the performance and accuracy of accelerometers. Based on the high-order coefficients of the quartz flexible accelerometer model, the nonlinear coefficients of the accelerometer model equation are identified by the multi-direction shaking table test. On the one hand, the mathematical model equation of accelerometer with high precision is established and perfected, the relationship between the working state of accelerometer and its high-order error coefficient is discussed, and the method of identifying the working state of accelerometer through its coefficient variation is sought. On the other hand, on the basis of the traditional time-domain and frequency-domain analysis, the multi-scale fuzzy entropy is used as the characteristic parameter to obtain the efficient acceleration signal representation parameter set. The working state of accelerometer is accurately identified by using support vector machine (SVM) pattern recognition method. Finally, the software of accelerometer vibration testing system is designed to realize the rapid diagnosis of accelerometer state, thus improving the manufacturing quality and yield of accelerometer. The research results show that the related research on quartz flexible accelerometers can accurately identify the working state of the accelerometers, and can effectively improve the manufacturing quality and finished product rate of quartz flexible accelerometers. It is helpful to form a technical way to improve the performance quality of quartz flexible accelerometer.
【學位授予單位】:西南科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TH824.4;TP212
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