Method for determining stationary phase of accelerometer based on dual-parameter accelerated degradation data

Abstract

The invention provides a method for determining the stationary phase of an accelerometer based on dual-parameter accelerated degradation data. The method is based on the assumption that the zero deviation and scale factors of the accelerometer degrade commonly and meet a power degradation law, the assumption that a high-temperature accelerated degradation test of the accelerometer meets the consistency condition of a failure mechanism, and the assumption that an accelerated model is an Arrhenius equation. The method comprises the following steps of: 1, establishing a degradation track model of the zero deviation and the scale factors; 2, estimating the pseudo-stationary phase of the zero deviation and the scale factors; 3, establishing a stationary phase accelerated model of the zero deviation and the scale factors; and 4, establishing a comprehensive reliable model of the stationary phase of the accelerometer, and determining the stationary phase of the accelerometer under the reliability. In the method, the influence of the zero-deviation degradation and the scale factors on the stationary phase of the accelerometer is taken into consideration simultaneously, horizontal information among different test temperatures is utilized fully by an integral maximum likelihood estimation process, so that the condition of the stationary phase of the accelerometer can be better describedunder the condition of dual-parameter common degradation, and the estimation accuracy is improved effectively.

Description

technical field [0001] The invention provides a method for determining the stability period of an accelerometer based on double-parameter accelerated degradation data, and belongs to the technical field of reliability evaluation of accelerated degradation data. Background technique [0002] The accelerometer is one of the key components of the inertial navigation system. It is used to measure the linear acceleration of the carrier, and then obtain the trajectory (speed and distance) of the carrier through integration. It has a wide range of inertial measurement and guidance in aviation, aerospace, and ships. application. [0003] The measurement accuracy of the accelerometer is mainly determined by the zero bias and the scale factor. However, in the long-term storage process, the zero bias and scale factor will change with the change of accelerometer material, structure and environmental conditions, which will have a bad influence on the measurement accuracy of the accelero...

AI Technical Summary

Problems solved by technology

For a complex product such as an accelerometer, its zero bias and scale factor have degradation characteristics at the same time, and the degree of influence on the stability period of the accelerometer and the degradation rate are equivalent, and the degradation of the zero bias and scale factor must be considered at the same time. A reasonable comprehensive assessment of the impact of the long-term impact, the traditional accelerated degradation test evaluation method obviously cannot meet this requirement

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