As a high-rise space steel structure controlled by wind,the wind vibration control technology is one of the important tech-nical means to reduce the risk of wind damage and tower collapse of the transmission tower.Aiming at the problem of inadequate adapt-ability of existing wind vibration control technology for transmission towers,a cable-lever rotation inerter system and its optimization design method that can be installed in the body of self-supporting transmission towers are proposed.Firstly,the motion control equa-tions of a typical transmission tower sections with a cable-lever rotation inerter damper(CLRID)are established,and then the paramet-ers of CLRID are analyzed based on the fluctuating wind load characteristics for vibration control.Finally,the parameters of CLRID are optimized in considering the performance demand of the tower,and the optimal designed parameters of CLRID are obtained under a fixed installed angle.Our results show that,in addition to the amplification effect of inerter on the deformation of damping element,the secondary amplification effect of damping element in RID can be realized by lever mechanism,and continue to increase the deforma-tion of damper,which can make up for the shortcomings of oblique installation of traditional internal cable system,so that CLRID with different cable angles has the same control effect of displacement responses of tower.At the same time,through parameter optimization analysis,it is recommended that the installed angle of cable of CLRID can be controlled between 30°～50°,and the lever amplification factor can be controlled between 1～2.When the target vibration mitigation ratio is determined,wind-induced vibration control of the transmission tower can be achieved precisely by the optimal design method of CLRID based on the performance demand.
关键词
输电塔/阻尼器/拉索-杠杆系统/惯容/随机响应/H2优化设计/风振控制
Key words
Transmission tower/Damper/Cable-lever system/Inerter/Stochastic response/H2optimization/Wind-induced vibration control
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