Device and method for producing wide pulse calibration accelerometer by utilizing variable cross-section bullet beam

Abstract

The invention relates to a device and method for producing wide pulse calibration accelerometer by utilizing variable cross-section bullet beam. The original bullet is replaced with a bullet beam composed of four bullets, and a large-size shaper is adopted. The device has the advantage of guaranteeing that groups of acceleration excitation pulse widths are same by adopting the bullet beam and thelarge-size shaper; the assembling is easy and feasible, the geometric shape of a bullet conical front end which mainly decides the excitation pulse waveform can be any changed, thereby satisfying different pulse widths and g value requirements; a calibration rod impact end can be effectively protected by utilizing the large-size shaper, thereby guaranteeing that the excitation pulse width caused by the every impact is same; the excitation pulse amplitude reduction caused by the shaper can be remedied through the way of increasing the bullet material wave impedance and the impact speed. The standard metering pulse with wide pulse width and high amplitude produced by the method is also suitable for the precise calibration of the 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 , Literature 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

Images