Apparatus and method for calibrating accelerometer by using bullet beam with variable cross-section to generate wide pulse

Abstract

The invention relates to a device and a method for calibrating an accelerometer by using a variable-section bullet beam to generate a wide pulse. The original bullet beam is replaced by a bullet beam composed of four bullet heads, and a large-size shaper is used. Beneficial effects: due to the use of bullet beams and the large-size shaper, the pulse width of several groups of acceleration excitation pulses can be guaranteed to be the same. The assembly is simple and feasible, and the geometric shape of the conical front end of the bullet, which mainly determines the excitation pulse waveform, can be changed arbitrarily, so as to meet the requirements of different pulse widths and g values. Using a large-size shaper can effectively protect the impact end of the calibration rod, and ensure that the pulse width of the excitation pulse generated by each impact is the same. The decrease in the amplitude of the excitation pulse caused by the shaper can be compensated by increasing the wave impedance and impact velocity of the bullet material. . The standard metering pulse with wide pulse width and high amplitude generated by the method is also suitable for accurate calibration of dynamic linearity of various dynamic speed sensors and displacement sensors.

Description

technical field [0001] The invention belongs to a device and a method for calibrating an accelerometer with a wide pulse, and relates to a device and a method for calibrating an accelerometer with a wide pulse generated by a variable-section bullet beam. Based on the Hopkinson rod device, the bullet beam with variable cross-section is used to hit the calibration rod. By changing the assembly method of each bullet in the bullet beam, three or more groups of high-g acceleration standard metering pulses with the same main frequency and different amplitudes are generated. The target pulse width generated by the cross-section bullet can reach more than 200μs, so as to achieve accurate calibration of the dynamic linearity of the high-g value accelerometer in a wider frequency range lower than the natural frequency of the accelerometer. Background technique [0002] refer to image 3 , Document 1 (Li Yulong, Guo Weiguo, Jia Dexin, etc., Research on the Calibration System of High-g ...

AI Technical Summary

Problems solved by technology

[0004] In fact, when calibrating the dynamic linearity of a high-g value accelerometer, the main frequency of the excitation pulse should not be too high, that is, the pulse width should not be too narrow, otherwise it may excite the natural frequency of the accelerometer to be tested, resulting in a large Calibration error

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