A Lifetime Prediction Method for Electric Propulsion Hollow Cathode Based on Failure of Tungsten Top Hole
A hollow cathode and life prediction technology, which is applied in the fields of electrical digital data processing, instrumentation, design optimization/simulation, etc., can solve problems such as difficulties in life evaluation, inability to obtain exact life and failure of hollow cathodes
Active Publication Date: 2020-05-12
HARBIN INST OF TECH
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Problems solved by technology
[0005] The present invention is to solve the problem that the exact life and failure confidence data of the hollow cathode cannot be obtained, and the life evaluation is difficult. Now it provides a method for predicting the life of the electric propulsion hollow cathode based on the failure of the tungsten top hole
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specific Embodiment approach 1
[0019] Specific implementation mode one: refer to Figure 1 to Figure 3 Specifically explain this embodiment, a method for predicting the life of an electric propulsion hollow cathode based on the failure of a tungsten top hole described in this embodiment,
[0020] Using COMSOL software, a small hole corrosion model is established for the hollow cathode to be tested. This experimental model can see the change of air pressure and the appearance of small hole corrosion.
[0021] Use this small hole corrosion model to simulate the small hole corrosion process of the experimental components. The corrosion of the tungsten top hole causes the hole diameter to become larger, and the larger hole diameter leads to a smaller internal air pressure. If the air pressure is small enough, the entire cathode will be unable to ignite or work too much and fail. The lifetime of the cathode is therefore related to the corrosion of the pinholes. The corrosion of the small hole corresponds to th...
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A life prediction method for an electric-propulsion hollow cathode based on tungsten top hole failure relates to the technical field of hollow cathode detection and aims to solve the problem that hollow cathode life evaluation is difficult. The life prediction method disclosed by the invention comprises the steps that a tungsten top hole erosion model is established at first; a hollow cathode used for simulation is put into the tungsten top hole erosion model for simulation; a time-based changing curve of air pressures inside the hollow cathode tungsten top hole simulated each time can be obtained; then, high-acceleration stress degeneration experiments are conducted to the hollow cathode with different to-be-predicted lives, so that a time-based changing curve of air pressures inside the hollow cathode tungsten top hole can be obtained; and finally, the two curves are compared. If the curves are consistent, the hollow cathodes with the maximum pressure and the minimum pressure inside the tungsten top hole in the hollow cathode with the to-be-predicted life are taken as standard hollow cathodes; the lives corresponding to the two standard hollow cathodes are taken as life scope end point values of the to-be-predicted life; and further, a life scope of the hollow cathode with the to-be-predicted life can be obtained.
Description
technical field [0001] The invention belongs to the technical field of hollow cathode detection. Background technique [0002] As more and more electric propulsion devices enter the engineering application stage from the early design and development stage, the reliability becomes an important factor limiting the entry of electric propulsion devices into space. It is an indispensable part of the two propulsion systems on the two mainstream space electric thrusters. The hollow cathode has a harsh working environment and thus becomes a weak point in the thruster system, and its life directly limits the entire electric propulsion device. The reliability of the hollow cathode can be said to be the "heart" of the entire electric thruster, so it is of great significance to explore the lifetime reliability of the hollow cathode. [0003] Since the hollow cathode has the characteristics of high cost, high reliability, long life (the life can even reach tens of thousands of hours), a...
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IPC IPC(8): G06F30/20G06F119/04G06F119/14
CPCG06F30/20G06F2119/04G06F2119/06
Inventor 宁中喜王亚楠王福锋刘晨光
Owner HARBIN INST OF TECH