衡阳市新一代天气雷达塔楼振动参数及共振问题研究

Research on structural vibration parameter and resonance of Hengyang New Generation Weather Radar Tower

衡阳市新一代天气雷达塔楼总高度为131.6m,顶部安装CINRAD新一代多普勒天气雷达系统。由于结构自身特性无法满足雷达生产厂家提出的结构自振频率大于1Hz的要求,通过对上海气象雷达塔的实测,得到CINRAD新一代多普勒天气雷达系统的转动频率,与计算得到的衡阳市新一代天气雷达塔楼结构第1阶自振频率之比为0.735,远在共振区范围之外;根据结构动力学相关公式及测试结果,推导出雷达天线运行时塔顶的加速度响应幅值为7.3cm/s^2。因此,CINRAD新一代多普勒天气雷达系统可以用于衡阳市新一代天气雷达塔楼,不会发生共振,且加速度响应较小。

Hengyang New Generation Weather Radar Tower has a total height of 131. 6m,and CINRAD New Generation Doppler Weather Radar System is installed on the top. Because of the structure characteristics,the self-vibration frequency of Hengyang Radar Tower cannot meet the requirement proposed by radar manufacturer that the self-vibration frequency of building should be larger than 1Hz. The rotational frequency of CINRAD New Generation Doppler Weather Radar System was obtained through the measurement of Shanghai Weather Radar Tower. The ratio of the rotational frequency of CINRAD to the calculated first order self-vibration frequency of Hengyang Radar Tower was 0. 735,which was far beyond resonance zone. According to the structural dynamics formula and test results,the amplitude of the acceleration response at the top of Hengyang Radar Tower was deduced as 7. 3cm/s2 when the radar antenna was running. As a consequence,CINRAD New Generation Doppler Weather Radar System could be installed on the top of Hengyang New Generation Weather Radar Tower,and the resonance would not occur and the acceleration response was small.