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A life prediction method for electric propulsion hollow cathode under the condition of heating wire failure

A hollow cathode and life prediction technology, which is applied in electrical digital data processing, instrumentation, design optimization/simulation, etc., can solve problems such as difficulties in evaluating the life of hollow cathodes

Active Publication Date: 2019-08-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem of difficult life evaluation of hollow cathodes, and now provides a life prediction method for electric propulsion hollow cathodes under the condition of heating wire failure

Method used

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  • A life prediction method for electric propulsion hollow cathode under the condition of heating wire failure
  • A life prediction method for electric propulsion hollow cathode under the condition of heating wire failure
  • A life prediction method for electric propulsion hollow cathode under the condition of heating wire failure

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specific Embodiment approach 1

[0055] Specific implementation mode one: refer to figure 1 Specifically explain this embodiment, a method for predicting the life of an electric propulsion hollow cathode under the failure condition of a heating wire described in this embodiment, the method is:

[0056] Preliminary preparation: average the resistance values ​​of all the heating wires to be tested μ 0 and variance σ 0 2 , and according to the mean μ 0 Set a reasonable threshold value of resistance value, compare the resistance value of all heating wires to be tested with the reasonable threshold value of resistance value, and remove the heating wires that are not within the threshold value range; select 10 heating wires from the heating wires that meet the threshold value range as the simulation experiment element, and ensure that the resistance of the 10 heating wires satisfies the normal distribution X~N(μ 0 ,σ 0 2 ),

[0057] Simulation Experiment: Establishing a Heating Wire Evaporation Model Using...

specific Embodiment approach 2

[0062] Specific embodiment 2: This embodiment is to further explain the life prediction method of the electric propulsion hollow cathode under the failure condition of a heating wire described in the specific embodiment 1. In this embodiment,

[0063] Filament Evaporation Model It is the evaporation model of the heating wire under constant current heating, and the establishment method of the evaporation model of the heating wire under the constant current heating is as follows:

[0064] Using the heating wire temperature measurement experiment to obtain the heating wire temperature T:

[0065] T=a×W+b=f(W) (1)

[0066] Among them, a and b are constants, the values ​​are 15.140 and 921.649 respectively, W is the heating power,

[0067] Obtain the evaporation rate J of the heating wire according to the heating wire temperature T T :

[0068]

[0069] Among them, K 0 no 0 As a constant, the value is 160331g / cm 2 s, e are natural constants, E 0 is the work function of ...

specific Embodiment approach 3

[0091] Specific embodiment 3: This embodiment is to further explain the life prediction method of the electric propulsion hollow cathode under the failure condition of a heating wire described in the specific embodiment 1. In this embodiment,

[0092] Filament Evaporation Model Be a constant pressure model, the establishment method of described constant pressure model is as follows:

[0093] Using the heating wire temperature measurement experiment to obtain the heating wire temperature T:

[0094] T=a×W+b=f(W) (1)

[0095] Among them, a and b are constants, the values ​​are 15.140 and 921.649 respectively, W is the heating power,

[0096] Obtain the evaporation rate J of the heating wire according to the heating wire temperature T T :

[0097]

[0098] Among them, K 0 no 0 As a constant, the value is 160331g / cm 2 s, e are natural constants, E 0 is the work function of tungsten, the value is 70247K,

[0099] Using the evaporation rate J T Obtain the corrosion rat...

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Abstract

The invention discloses a life prediction method of a electric propulsion hollow cathode under heating wire failure condition, relating to the technical field of hollow cathode detection. The invention aims at solving the problem that the life evaluation of the hollow cathode is difficult. The life prediction method of a electric propulsion hollow cathode under heating wire failure condition disclosed by the invention comprises the following steps: confirming the model foundation of the simulation experiment in the preliminary preparation, and obtaining the simulation experiment element; establishing the heating wire evaporation model in the simulation experiment, performing simulation on the simulation experiment element using the heating wire evaporation model and obtaining the simulation life; and detecting the heating wire to be detected directly in the short-term experiment and obtaining the prediction life. The life prediction method of a electric propulsion hollow cathode under heating wire failure condition disclosed by the invention is suitable for the life prediction of heating wire.

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] When the cathode is ignited and started, an external heater is required to heat the emitter to a high enough temperature to achieve gas breakdown ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 宁中喜王亚楠于达仁王福峰张海广韩星
Owner HARBIN INST OF TECH