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通过对不同位置粘贴有水线的斜拉索模型进行测力和测振风洞试验,分析了不同雷诺数下的阻力系数、升力系数和振幅等参数,研究了水线影响雷诺数效应及通过影响雷诺数效应导致振动的机理,研究结果表明:水线能影响力系数随雷诺数的变化规律,力系数的大小和变化规律与振动有着十分密切的关系;在较低的水线位置,随着雷诺数的上升,伴随着阻力系数的减小,升力系数大幅增大,发生类似临界雷诺数的效应,力系数随水线位置的变化规律导致驰振系数为负,在这种情况下发生大幅振动,用临界雷诺数效应和驰振均可解释;在较高的雷诺数下,伴随着阻力系数的减小,升力系数大幅变化,每个水线位置都发生了不同程度的振动,该振动的机理可能与临界雷诺数效应导致的振动机理类似。
Through the force-measuring and vibration-measuring wind tunnel test on the cable stayed cables with different locations, the drag coefficient, lift coefficient and amplitude at different Reynolds numbers are analyzed. The effect of Reynolds number on the waterline is also studied. The results show that waterline can influence the variation of force coefficient with Reynolds number, the size and variation of force coefficient have a very close relationship with vibration. At the lower waterline, With the increase of Reynolds number, along with the decrease of the drag coefficient, the lift coefficient increases greatly and the effect similar to the critical Reynolds number occurs. The force coefficient changes with the variation of the waterline, which leads to the relaxation of the relaxation coefficient. In this case, Large amplitude vibration can be explained by the critical Reynolds number effect and galloping. At higher Reynolds numbers, the lift coefficient changes greatly with the decrease of the drag coefficient, and the water level vibrates to some extent at each waterline. The mechanism of vibration may be similar to that caused by the critical Reynolds number effect.