Simulation method and device for harmonic detection of interface pressure of cable joint, and medium

By establishing a simulated geometric model of cable joints and simulating nonlinear interaction forces, the relationship between the interface pressure of cable joints and ultrasonic harmonic amplitude was studied, and the problem of difficulty in accurately detecting the interface pressure of cable joints in the existing technology was solved, and a fast and accurate interface pressure evaluation was achieved, providing key data for cable design optimization.

CN119643018AActive Publication Date: 2025-03-18CHINA ELECTRIC POWER RESEARCH INSTITUTE CO LTD +2
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Patent Information

Application Number
CN202411574452.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-06
Publication Date
2025-03-18
Estimated Expiration
2044-11-06

AI Technical Summary

Technical Problem

The prior art is difficult to accurately detect the interface pressure of the cable joint, resulting in a high incidence of cable failures. The existing simulation research lacks effective exploration of the relationship between ultrasonic harmonic parameters and pressure.

Method used

A simulation method for detecting the interface pressure of the cable joint is proposed. By establishing a simulation geometric model of the cable joint, and setting up an ultrasonic excitation source and a nonlinear spring damper on the model, simulating the nonlinear interaction force at the interface of the cable joint, and then obtaining the amplitude of the harmonics and subharmonics under different interface pressures through nonlinear ultrasonic detection.

Benefits of technology

The accurate study of the relationship between the interface pressure of the cable joint and the ultrasonic harmonic amplitude is achieved, further experimental research methods are provided, interference with the actual cable joint is avoided, interface pressure is evaluated quickly and accurately, and key data is provided for the design optimization of the intermediate connector of the cable.

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Abstract

The invention provides a simulation method and device for detecting interface pressure of a cable joint through harmonic waves and a medium. The method comprises the following steps: modeling a simulation geometric model for the cable intermediate joint, and setting an ultrasonic excitation source; modeling through a nonlinear spring damper to obtain a cable joint pressure model; and performing nonlinear ultrasonic detection cable joint interface pressure simulation on the cable joint pressure model to obtain a spectrogram at each point probe. According to the invention, on a cable joint model, modeling is carried out through a nonlinear spring damper, nonlinear interaction at a cable intermediate joint interface is simulated, a nonlinear harmonic detection principle is utilized, and the change of harmonic characteristics when the interface pressure changes is deeply explored, so that the relationship between the two is established; the states of the cable intermediate joint under various interface pressures are accurately simulated, the interface pressure of the cable intermediate joint is fully considered, and simulation analysis is performed on the interface pressure detection of the cable joint by establishing a new interface nonlinear model.
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