Measuring Method of Accelerometer Scale Factor Stability

Abstract

The invention provides a method for detecting accelerometer scale factor stability. The method includes the following steps: installing surfaces of a hexahedron installing device is equipped with accelerometers in different states; the hexahedron installing device equipped with the accelerometers is put in a thermostat in a cycle period, first preset temperature is kept for preset duration, the temperature falls to a second preset temperature after the preset duration, and a four-point rolling test is conducted in a gravity field to calibrate an accelerometer scale factor; and after N periods of circulation, data processing is performed on the accelerometer scale factor obtained in each period, thereby obtaining an accelerometer scale factor change law. The method for detecting the accelerometer scale factor stability provided by the invention can rapidly assess the scale factor stability of the accelerometers, and save production cost.

Description

technical field [0001] The invention relates to the technical field of accelerometer testing, in particular to a method for detecting the stability of the scale factor of the accelerometer. Background technique [0002] As an important device for inertial navigation, guidance and control, quartz flexible accelerometer (hereinafter referred to as accelerometer) has the advantages of high measurement accuracy and good stability. Affected by environmental loads such as temperature and vibration and changes in the characteristics of the accelerometer’s internal component materials, the stability of the accelerometer’s parameters will drift over time, resulting in navigation errors. At present, the inertial navigation system usually uses regular calibration methods to solve the parameters Drift problem. [0003] The problem of the long-term stability of the current accelerometer scale factor: the components of the accelerometer are connected by adhesive or welding, the residual ...

AI Technical Summary

Problems solved by technology

[0003] The problem of the long-term stability of the current accelerometer scale factor: the components of the accelerometer are connected by adhesive or welding, the residual stress generated during the adhesive curing process and the welding process, and the assembly stress generated during the assembly process, these residual stresses change with the environmental load The influence of the permanent magnet material will be released, which will not only cause mechanical relaxation, but also cause relative displacement of the bonded components; the stability of the permanent magnet material will change with the influence of environmental factors such as temperature and vibration, and the stability of the magnetic properties will change. The above factors Changes lead to poor long-term stability of the accelerometer scale factor. In order to ensure the accuracy of the system, the inertial system usually needs to be calibrated regularly, which consumes a lot of manpower, material resources and financial resources.

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