Aerospace current-carrying slip ring temperature rise modeling method based on multi-physics field coupling

Abstract

The invention relates to an aerospace current-carrying slip ring temperature rise modeling method based on multi-physics field coupling, and belongs to the technical field of conductive friction pairs. The method comprises the following steps: firstly, calculating a theoretical contact region of a brush contact and a confluence disc, and calculating contact resistance and contact resistance heat of the brush contact and the confluence disc based on conductive spots; in addition, the resistance Joule heat is calculated based on the resistance of the bus plate, and the friction heat between the sliding contact and the bus plate is further calculated. and finally, the total heat generated by the contact resistance heat, the confluence disc resistance Joule heat and the friction heat is synthesized, the heat dissipation rate is calculated through heat radiation, and the heat dissipation rate and the generated heat reach dynamic balance to calculate the steady-state temperature. Compared with a previous experimental measurement method, the method has the advantages that the coupling relation among a thermal field, a force field and an electric field is explored, modeling is performed on a temperature rise mechanism of the current-carrying slip ring for spaceflight, and factors influencing the temperature of the current-carrying slip ring are analyzed, so that the method has the advantages of saving a large amount of funds and time and improving the working reliability of the satellite current-carrying slip ring.

Description

technical field [0001] The invention relates to the technical field of conductive friction pairs, in particular to a modeling method for the temperature rise of an aerospace current-carrying slip ring based on multi-physics field coupling. Background technique [0002] Aerospace current-carrying slip rings are a key component of satellite energy supply systems. They are used to transmit current and signals between solar panels and stars, and have an important impact on the life of satellites. During the normal working process of the current-carrying slip ring, there is load pressure and frictional heat generation between the brush contacts and the collector plate. In this state, the wear of the current-carrying slip ring will be aggravated. In addition, with the accumulation of wear debris, the current transmission of the current-carrying slip ring will be gradually affected, and the slip ring will eventually fail. In the state of multi-physics coupling, the load pressure ...

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Problems solved by technology

[0003] At present, the research on current-carrying friction and wear mostly uses experimental methods to analyze the influence of pressure and current-carrying on the life of the slip ring. However, the current-carrying slip rings used in aerospace are expensive and have a long operating life, so they cannot analyze the factors that affect the temperature of the slip ring. to analyze

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