Dynamic Modeling Method Of High-g Accelerometer And Test System

The Dynamic modeling method of High-g Accelerometer and Test System is researched, proposing the methods and procedures of model and establishing the dynamic mathematical model. The amount of dynamic calibration test can be reduced through simulation; also the sensor and the authentic dynamic characteristics of the test system are determined. In this paper, the following aspects are conducted:1. Modeling methods:a new model method is proposed which suits High-g Accelerometer and Test System aiming at identifying the parameters and order of the systems at the same time, whose algorithm combines SIM (IV) and SIM (RF) together. By comparing the known signal and system modeling methods, this method is confirmed to be of high calculating speed and precision. The Order and accuracy of the data are recognized by researching the rules of model order and identifying it using two methods at the same time.2. Data processing:using EMD based on LS-SVR to study the eliminating methods of laser Doppler signal trend item. This method can suppress the edge effect of the original EMD, and the accuracy is much higher. The low-pass filtering method for the narrow width half-sine-shaped of 7-order Chebyshev filter and FRR is researched specifically, whose peak error is 0.45% to meeting project needs.3. Experiments:narrow pulse calibration tests for High-value g sensor are conducted for establishment of a dynamic mathematical model and regression verification; also the operating band and the installing resonant frequency that have been most concerned about are achieved. High acceleration impact test systems are adopted to calibrate laboratory-made high-g acceleration test system, establishing its high-order and second-order mathematical model mathematical models. And the operating band and the resonance frequency of the test system through regression testing and error analysis.4. Application in engineering:the mathematical model for high acceleration of a missile-borne test system is established to get the operating band; and as the frequency range of the measured signal, the design principles of the test system are analyzed and determined.