构建了跳线-导线-绝缘子串精细化有限元耦合模型，进行脉动风荷载作用下的动力响应分析，着重探究了跳线风偏与导线风偏动力特性的差异性。阐明了导、跳线在模态、气动阻尼比等动力特性上存在明显不同的特征，采用频域法结合多工况分析，研究了平均风速、湍流度、跳线悬垂串质量及振型组合阶数对导、跳线脉动背景响应及共振响应的影响。研究结果表明：跳线基频约为导线的1.5倍~2.0倍，并且气动阻尼效应对跳线风偏的影响远小于导线。导线脉动风偏位移响应以背景响应为主，而共振响应并不显著，但跳线脉动风偏位移响应的共振分量不可忽略，产生的共振增量可使跳线脉动风偏位移增大30%以上。跳线共振响应特性由跳线自身动力特性决定，受来流平均风速、湍流度影响较小，1阶振型对跳线共振响应起到决定作用。本文基于准静态法及惯性力法推导了峰值脉动风力共振部分，引入共振因子，修正了规范中跳线风振系数表达式。修正的跳线风振系数最终相较规范将增大约9%~12%。
Abstract
To investigate the difference of wind-induced swing characteristics between long span conductors and jumper lines, a refined finite element model coupling the jumper lines, long span conductors and insulator strings is constructed. The research elucidates the different dynamic characteristics, included mode and aerodynamic damping ratio, between the conductors and jumper lines. Combining with the frequency-domain method, multiple cases are calculated to analyze the effect of wind field and line parameters on the dynamic response of conductors and jumper lines. Results show that: The fundamental frequency of jumper lines is approximately 1.5~2.0 times that of conductors. The effect of aerodynamic damping on jumper lines is much smaller than that of conductors. The dynamic response of conductors is dominated by the background response, while the resonance response is not significant. However, the resonance response increases the wind -induced swing response by more than 30%, which should be considered in the wind-resistance design of jumper lines. The resonance response characteristics of jumper lines are determined by their own dynamic characteristics, and are relatively less affected by the upstream wind. The fundamental mode plays a decisive role in the resonance response of jumper lines. Based on the quasi-static and inertia force method, this paper derives the resonance part of peak fluctuating wind force for jumper lines, introduces the resonance factor, and amend the gust response coefficient. The amended gust response coefficient increases by about 9%~12% compared to the code.
关键词
输电线路跳线 /
风偏 /
气动阻尼 /
共振 /
频域法 /
风振系数
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Key words
jumper line of transmission line /
wind-induced swing /
aerodynamic damping /
resonance response /
frequency-domain method /
gust response coefficient;
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