Multi-mode electric thruster service life prediction method based on time-varying stress

Abstract

A multi-mode electric thruster service life prediction method based on time-varying stress comprises the following steps: acquiring working modes of different detection stages and working time corresponding to each working mode; obtaining sputtering etching initial degradation rates, drift coefficients and diffusion coefficients under stresses of different working modes through a pre-trained parameter prediction model; calculating the sputtering etching degree of the grid system of the electric thruster under the time-varying stress according to the sputtering etching initial degradation rate, the drift coefficient and the diffusion coefficient; according to the sputtering etching degree of the grid system of the electric thruster under the time-varying stress, the abrasion change condition of the grid under the stress is calculated; setting a sputtering etching threshold value, calculating the time required for reaching the etching threshold value of the acceleration gate in each working mode according to the wear change condition of the gate, and accumulating the time to obtain the service life of the electric thruster; according to the method, the influence of sputtering etching of the electric thruster on the service life in different modes is considered, and the service life of the electric thruster is obtained through accumulation of sputtering etching conditions in all the modes.

Description

Technical field [0001] The present invention relates to the field of electric push power, and more particularly to a multi-mode electric thrust life prediction method based on time-based stress. Background technique [0002] In deep space detection, the detector often fails in deep space for a few years to arrive at the destination. The electric push force acts as a thrust adjustment in flight, and the gesture maintenance is maintained, and the electric push force has reached tens of thousands or even dozens. Thousands of hours, so the lifetime of the thrust is very important for the success or failure of the task. The power supply of the electric push force is mainly based on solar irradiation conversion. Since the detection distance is getting farther, the acquired solar light is constantly changing, the power supply power also changes, requires constant adjustment of the working mode of the electric thruster, different modes The degree of damage to the lower thrust is differen...

AI Technical Summary

Problems solved by technology

The power supply of the electric thruster mainly depends on the conversion of solar radiation. As the detection distance is getting farther and farther, the intensity of the sunlight obtained is constantly changing, and the power supply power is also changing accordingly. It is necessary to constantly adjust the working mode of the electric thruster. Different modes The damage degree of the lower thruster is different. In the past, the influence of the working mode was not considered in the life prediction, and only the life under the average stress was considered during the test.

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