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为比较不同高度稳定板单侧和上、下组合设置时断面的颤振性能,并说明设置中央稳定板前后不同攻角下颤振发散机理的改变,针对一特定的单箱断面悬索桥,设计并开展了一系列节段模型风洞试验。首先研究了3个攻角(3°,0°,-3°)下单侧设置稳定板对颤振性能的影响,进而同时改变上侧和下侧稳定板的高度,探索对应攻角下断面的抗风效果,从而给出稳定板组合设置时的最优高度取值。结合二维三自由度颤振分析方法(2d-3DOF),分析了最优中央稳定板组合设置断面相比于原始断面颤振发散机理的变化。结果表明:无论是上侧或下侧,单侧设置稳定板断面的颤振临界风速基本呈随着稳定板高度先增大后减小的趋势,合理高度的稳定板能提高颤振临界风速;相比于单侧稳定板,同时设置上、下稳定板对于气动稳定性能的改善效果更佳;二维三自由度分析结果显示,中央稳定板显著改变了颤振发散驱动机理,组合设置稳定板的最优断面和原始断面气动阻尼随风速的变化趋势明显不同。
In order to compare the flutter characteristics of single-side and upper-lower combination of different height stabilizer plates, and to explain the change of flutter divergence mechanism at different angles of attack before and after the installation of central stabilizer plate, aiming at a single single-section suspension bridge, A series of wind tunnel tests have been carried out. First of all, the effect of single side stabilizer plate on flutter performance under 3 angles of attack (3 °, 0 °, -3 °) is studied. Then the height of the upper and lower stabilizer plates is changed at the same time, The wind effect, which gives the stability plate combination set the optimal height value. Combined with two-dimensional three-degree-of-freedom chatter analysis method (2d-3DOF), the change of chattering divergence mechanism of the optimal central stabilizer plate is analyzed. The results show that the critical flutter velocity of the flutter with one side stabilizing plate is basically the same as the height of the stabilizer plate first increases and then decreases with the increase of the stabilizer plate height. Compared with the unilateral stabilizer, the stability of the upper and lower stabilizers is better for aerodynamic stability. The two-dimensional three-degree-of-freedom analysis shows that the central stabilizer significantly changes the flutter divergence driving mechanism and the combination of the stabilizer plate The aerodynamic damping of the optimal cross section and the original cross section change obviously with the variation of wind speed.