本文選題：舞動(dòng) + 覆冰導(dǎo)線　； 參考：《土木工程學(xué)報(bào)》2017年02期

【摘要】：利用風(fēng)洞內(nèi)支架式三自由度頻率可調(diào)的彈簧懸掛裝置對(duì)D形覆冰六分裂導(dǎo)線節(jié)段氣彈模型進(jìn)行舞動(dòng)試驗(yàn),在不同氣動(dòng)力特性的風(fēng)攻角下調(diào)整豎/扭自振頻率比及風(fēng)速,激發(fā)并記錄純豎向、純扭轉(zhuǎn)、豎扭耦合和扭轉(zhuǎn)水平耦合等失穩(wěn)舞動(dòng)。分別基于實(shí)測(cè)響應(yīng)和三自由度舞動(dòng)響應(yīng)非線性數(shù)值模擬結(jié)果識(shí)別導(dǎo)線的豎向和扭轉(zhuǎn)氣動(dòng)阻尼并與Den Hartog或Nigol舞動(dòng)理論計(jì)算值進(jìn)行對(duì)比,研究導(dǎo)線氣動(dòng)阻尼與氣動(dòng)特性、自振特性及風(fēng)速之間的關(guān)系。試驗(yàn)結(jié)果發(fā)現(xiàn):由于Den Hartog或Nigol系數(shù)正負(fù)不同以及豎/扭頻率比不同,導(dǎo)線氣動(dòng)負(fù)阻尼絕對(duì)值會(huì)隨風(fēng)速提高以指數(shù)形式增大或者是隨風(fēng)速提高先增大后減小至小于結(jié)構(gòu)阻尼;用單自由度舞動(dòng)理論來(lái)預(yù)測(cè)三自由度舞動(dòng)存在較大缺陷且偏于不安全�；谔卣髦禂z動(dòng)法提出覆冰分裂導(dǎo)線豎向-水平-扭轉(zhuǎn)三自由度耦合的舞動(dòng)穩(wěn)定性判斷條件式,解釋了無(wú)法用Den Hartog或Nigol單自由度穩(wěn)定性判斷條件式說(shuō)明的舞動(dòng)現(xiàn)象,并得到試驗(yàn)結(jié)果的驗(yàn)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(xué)結(jié)構(gòu)工程研究所;河南省電力試驗(yàn)研究院;
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目(51178424,51378468)
【分類(lèi)號(hào)】：TM752

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本文編號(hào)：1731220