结构顺横风振综合被动控制的研究

On Comprehensive Passive Control of Along-Wind and Across-Wind Vibrations of Structures

在强风作用下，结构既可在两主轴方向产生顺风向风振，同时在两主轴之一产生顺风向风振时，另一主轴方向可产生横风向风振，当横风向结构自振频率与涡流脱落频率一致时，可产生远大于顺风向风振的共振响应．因此在两主轴方向刚度等相差不大的情况下，两主轴方向在振动控制研究中都必须予以注意．文中采用交叉型被动阻尼器，为了充分发挥阻尼器的作用，采用作者建议的互通式管式液体阻尼器来代替单向的管式液体阻尼器，对质量阻尼器也沿主轴布置弹簧和阻尼．对液体阻尼器的非线性流动，采用作者建议的能量原则代替一般资料建议的力的原则来计算等效线性阻尼比．

Under the strong-wind action, not only along-wind vibration but also across-wind vibration of the structure may occur simultaneously. Whilealong-wind vibration occurs in one axis direction of the structure, across-wind vibration occurs certainly in another axis direction of the structure. For across-wind vibration of the structure, the intensive resonance occurs when the frequency of the structure approaches the frequency of vortex shedding. It is obvious that we should pay great attention to two directions of principle axes of the structure. In this paper, crossed TMD and TLD with a tube-like through container proposed by the author are introduced so that both along-wind and across-wind vibrations of the structure may be suppressed. Dynamic response properties of nonlinear liquid damping are analysed using a new version of linearization technique proposed by the author, which is based on energy equivalent criterion. A numerical example is given for illustration.