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在实际工程中圆柱结构顺流向的涡激振动比较常见,其对结构的疲劳破坏影响也十分显著。该文分析了弹性支承圆柱在顺流向第一不稳定区内的涡激振动,运用Van der Pol方程描述对称旋涡脱落的尾迹特性,采用尾流振子模型计算结构响应,并研究了质量-阻尼参数和质量率对顺流向涡激振动的影响机理。数值计算结果表明,在第一不稳定区内,弹性支承圆柱顺流向涡激振动存在临界质量率。
In practical engineering, the vortex-induced vibration of the cylindrical structure is relatively common, and its impact on the structural fatigue failure is also very significant. In this paper, the vortex-induced vibration of the elastic support cylinder in the first unstable region is analyzed. The Van der Pol equation is used to describe the wake characteristics of symmetrical vortex shedding. The wake response model is used to calculate the structural response. The mass-damping parameters And the influence of mass rate on the vortex-induced vibration. The numerical results show that in the first unstable region, the critical mass rate of vortex-induced vibration of the elastic supporting cylinder in the downstream is present.