移动载荷作用下输电线路的动力响应分析

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中图分类号：TM75；TP242

DOI：10.3969/j.issn.1004-132X.2025.09.025

DynamicResponseAnalysesofPowerTransmissionLinesunder Moving Loads

ZHANG Shenting LEI Jin JIA Wenxing ZHANG Xinyu JIN Peng QIN Xinyan* College of Mechanical and Electrical Engineering，Shihezi University，Shihezi，Xinjiang，832003

Abstract：Given the substantial vibrational excitation caused by inspection equipment on transmission lines and unclear vibration mechanism，the dynamic characteristics of power transmission lines under the influences of moving loads was investigated to explore their dynamic responses and vibration patterns. A three-dimensional dynamic nonlinear cable model was developed，and dynamics modeling of the inspection robots was conducted.Using the combined Lagrange-Ritz method，dynamics equations of the coupled systems of moving loads and power transmission lines were discretized.Numerical simulations were per formed with MATLAB to analyze the impacts of nonlinear effects on the power transmisson lines.Simulations were conducted for typical scenarios involving varying speeds of moving loads and different installation height diferences of the power transmission lines.The results show that under the influences of moving loads，the power transmission lines exhibit significant nonlinear large-displacement characteristics and terminal efectiveness，with a maximum nonlinearity factor for axial force increments reaching 1.677. Increase the moving load speeds（ 0.5～2m/s ）results in increases of 2.4% ， 3.9% ，and 4.4% in lateral displacement，longitudinal displacement and axial force increments，respectively，with terminal efect amplitudes increasing by 140% ， 138% ，and 225% . Increasing the installation height difference（ 0～10m ）reduces thevertical sag distance of the transmission lines，with longitudinal displacement and axial force increments decreasing by 7.3% and 6.2% respectively，and a maximum reduction in terminal effect vibration frequency of 50% . These findings provide theoretical reference for the engineering designs of similar cable structures under moving loads.

Key words： dynamic response analysis；power transmission line；moving load;nonlinear effectiveness

0 引言

输电线路作为电力系统中的关键基础设施，负责电力的传输任务。（剩余20560字）