本文選題：舞動 + 覆冰導線��； 參考：《土木工程學報》2017年02期

【摘要】：利用風洞內支架式三自由度頻率可調的彈簧懸掛裝置對D形覆冰六分裂導線節(jié)段氣彈模型進行舞動試驗,在不同氣動力特性的風攻角下調整豎/扭自振頻率比及風速,激發(fā)并記錄純豎向、純扭轉、豎扭耦合和扭轉水平耦合等失穩(wěn)舞動。分別基于實測響應和三自由度舞動響應非線性數(shù)值模擬結果識別導線的豎向和扭轉氣動阻尼并與Den Hartog或Nigol舞動理論計算值進行對比,研究導線氣動阻尼與氣動特性、自振特性及風速之間的關系。試驗結果發(fā)現(xiàn):由于Den Hartog或Nigol系數(shù)正負不同以及豎/扭頻率比不同,導線氣動負阻尼絕對值會隨風速提高以指數(shù)形式增大或者是隨風速提高先增大后減小至小于結構阻尼;用單自由度舞動理論來預測三自由度舞動存在較大缺陷且偏于不安全。基于特征值攝動法提出覆冰分裂導線豎向-水平-扭轉三自由度耦合的舞動穩(wěn)定性判斷條件式,解釋了無法用Den Hartog或Nigol單自由度穩(wěn)定性判斷條件式說明的舞動現(xiàn)象,并得到試驗結果的驗證。
[Abstract]:In this paper, the three-degree-of-freedom spring suspension device with support in wind tunnel is used to perform galloping test on D-shaped ice-coated six-split conductor segment Aeroelastic model. The vertical / torsional natural vibration frequency ratio and wind speed are adjusted under different attack angles of aerodynamic characteristics.Excitation and recording of pure vertical, pure torsion, vertical torsional coupling and torsional horizontal coupling instability dance.The vertical and torsional aerodynamic damping of conductors are identified based on the results of nonlinear numerical simulation of measured responses and three-degree-of-freedom galloping responses, and compared with the calculated values of Den Hartog or Nigol galloping theory, the aerodynamic damping and aerodynamic characteristics of conductors are studied.The relationship between natural vibration characteristics and wind speed.The experimental results show that due to the difference of Den Hartog or Nigol coefficients and the ratio of vertical / torsional frequency, the absolute value of aerodynamic negative damping of conductors increases exponentially with the increase of wind speed or decreases to less than the structural damping at first and then decreases with the increase of wind speed.The theory of single degree of freedom is used to predict that the three degree of freedom galloping has great defects and is not safe.Based on the eigenvalue perturbation method, a condition for judging the galloping stability of ice-coated split conductors coupled with vertical, horizontal and torsional three degrees of freedom is presented, which explains the galloping phenomenon which can not be explained by Den Hartog or Nigol single degree of freedom stability judgment condition.The experimental results are verified.
【作者單位】： 浙江大學結構工程研究所;河南省電力試驗研究院;
【基金】：國家自然科學基金面上項目(51178424,51378468)
【分類號】：TM752

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本文編號：1731220