Life prediction method of electric propulsion hollow cathode under heating wire failure condition
A technology of life prediction and hollow cathode, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as difficulties in life evaluation of hollow cathodes
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specific Embodiment approach 1
[0055] Specific implementation mode one: refer to figure 1 Specifically illustrate 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 Us...
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 Be the evaporation model of heating wire under constant current heating, the establishment method of the evaporation model of heating wire under described 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 tungsten,...
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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