CN-122017353-A - Contact resistance prediction method based on temperature

CN122017353ACN 122017353 ACN122017353 ACN 122017353ACN-122017353-A

Abstract

The invention discloses a contact resistance prediction method based on temperature, which predicts the change trend of contact resistance when external load is unchanged in a theoretical calculation mode by measuring basic parameters of a contact interface, assists scientific researchers to remove the influence of temperature on the measured value of the contact resistance, and provides correction basis for the contact characteristics of the analysis interface.

Inventors

ZHANG WANGLONG
TA WURUI
ZHANG HAIYANG

Assignees

兰州大学

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (2)

1. The temperature-based contact resistance prediction method is characterized by comprising the following steps of: S1, obtaining basic parameters of a contact interface by consulting literature or measurement, wherein the basic parameters comprise direct current for measuring contact resistance Initial contact resistance Equivalent thermal resistance Time constant of heat Maximum breakdown rate Breakdown threshold temperature rise Threshold smoothness Temperature coefficient of resistivity Equivalent heat capacity Number of non-conductive paths Number of initially conductive paths Coefficient of thermal softening in contact ; S2, establishing a temperature and breakdown proportion prediction equation set changing with time, wherein the equation set is as follows: In which, in the process, In order to integrate the time intervals of the time, For the power-on time of the direct current, Is that The amount of temperature change at the contact interface at the time, Is that The amount of temperature change of the contact interface at the moment, Is that The proportion of the breakdown at the moment in time, Is that The breakdown ratio at the moment; s3, through the equation set Calculating When (1) And In which, in the process, Is that Contact resistance at time; s4, the step S3 is performed When (1) And Substituting into the equation set established in the step S2, and calculating to obtain When (1) And ; S5, the step S4 is performed And Substitution formula: can be obtained by Contact resistance at time; And S6, cycling the calculation of the steps S3-S5 by taking the calculation results in the step S4 and the step S5 as the known quantity for calculating the parameter value at the next moment, and obtaining the contact resistance at any moment.
2. The method of temperature-based contact resistance prediction according to claim 1, wherein in step S2, the integration time interval 。

Description

Contact resistance prediction method based on temperature Technical Field The invention belongs to the technical field of contact resistance measurement, and particularly relates to a contact resistance prediction method based on temperature. Background In the engineering structure system, when the contact characteristic (contact force and the like) of the interface changes, the contact resistance of the interface can be measured in real time by supplying direct current to two sides of the interface so as to obtain the contact characteristic of the interface and analyze the contact characteristic, but the direct current can generate temperature when flowing through the interface, the temperature can also cause the actual measurement value of the contact resistance to change, so that a researcher cannot distinguish whether the actual measurement value of the contact resistance changes due to the change of an external working condition or the actual measurement value of the contact resistance changes due to the temperature, and for some engineering applications requiring long-term online detection of the contact characteristic of the interface, the contact resistance change due to the temperature can greatly influence the evaluation of the contact characteristic of the interface by researchers. Disclosure of Invention The invention aims to provide a temperature-based contact resistance prediction method to solve the problems set forth in the background art. In order to achieve the above purpose, the invention provides a temperature-based contact resistance prediction method, which comprises the following steps: S1, obtaining basic parameters of a contact interface by consulting literature or measurement, wherein the basic parameters comprise direct current for measuring contact resistance Initial contact resistanceEquivalent thermal resistanceTime constant of heatMaximum breakdown rateBreakdown threshold temperature riseThreshold smoothnessTemperature coefficient of resistivityEquivalent heat capacityNumber of non-conductive pathsNumber of initially conductive pathsCoefficient of thermal softening in contact; S2, establishing a temperature and breakdown proportion prediction equation set changing with time, wherein the equation set is as follows: In which, in the process, In order to integrate the time intervals of the time,For the power-on time of the direct current,Is thatThe amount of temperature change at the contact interface at the time,Is thatThe amount of temperature change of the contact interface at the moment,Is thatThe proportion of the breakdown at the moment in time,Is thatThe breakdown ratio at the moment; s3, through the equation set CalculatingWhen (1)AndIn which, in the process,Is thatContact resistance at time; s4, the step S3 is performed When (1)AndSubstituting into the equation set established in the step S2, and calculating to obtainWhen (1)And; S5, the step S4 is performedAndSubstitution formula: can be obtained by Contact resistance at time; And S6, cycling the calculation of the steps S3-S5 by taking the calculation results in the step S4 and the step S5 as the known quantity for calculating the parameter value at the next moment, and obtaining the contact resistance at any moment. Preferably, in step S2, the integration time interval。 Compared with the prior art, the invention has the beneficial effects that: For some engineering applications requiring long-term online detection of interface contact characteristics, the method can predict the contact resistance change trend when the external load is unchanged by establishing a temperature-based contact resistance change prediction method, and assist scientific researchers to remove the influence of temperature on the measured value of the contact resistance, thereby providing a correction basis for analyzing the interface contact characteristics. Drawings FIG. 1 is a schematic diagram of current constriction provided by an embodiment of the present invention; FIG. 2 is a schematic diagram of a calibration experiment provided in an embodiment of the present invention; FIG. 3 is a graph of contact resistance decay provided by an embodiment of the present invention; FIG. 4 is a graph of temperature difference provided by an embodiment of the present invention; FIG. 5 is a breakdown proportional graph provided by an embodiment of the present invention; Fig. 6 is a graph showing a comparison of a predicted contact resistance and an actual contact resistance according to a temperature-based contact resistance prediction method according to an embodiment of the present invention. Detailed Description The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in t