抽水蓄能电站拦污栅结构振动特性模型试验研究

结合天荒坪抽水蓄能电站尾水拦污栅流激振动试验 ,研究了拦污栅自振特性。对栅架整体结构模型的自振频率和振型进行了量测 ,并与数值计算结果作了对比 ,二者基本吻合 ,说明成果是可靠的 ;此外 ,还对栅架支承条件对拦污栅自振频率的影响以及单根栅条的自振频率特性进行了探讨。依据对单根栅条模型试验的结果 ,文中对 L evin建议的计算栅条自振频率公式的适用性提出了质疑 ,并对工程界所关注的栅条可能发生共振的原因提出了一个新的解释

Experimental study of the free vibration characteristics of the trashrack of the Tianhuangping pumped storage station

The free vibration characteristics of the trashrack structures, including the whole structure model and the single rack bars, are studied as part of flow induced vibration studies of the trashrack of the Tianhuangping pumped storage station. The calculated free vibration frequencies and mode shapes of the whole structural model compare well with measured values. The influences of the various supporting conditions upon the frequencies of the trashrack and the free vibration characteristics of the single rack bars were then studied. The experimental data obtained from tests of the single rack bars were used to approoch the applicability of the formulation proposed by Levin to calculate the vibration frequencies of rack bars. Finally, a new explanation is presented for the inducement of resonance in the rack bars.