Vibration Response Characteristics of Slabs in Plunge Pool of Guandi Hydropower Station
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Abstract:
Based on the prototype observation results of dynamic displacement response from plunge pool slabs of Guandi hydropower station, the characteristics of vibration strength distribution in slabs were analyzed under different spillway conditions. The dominant frequency of vibration was studied using the modern spectral analysis method. Then the influence of spillway condition and discharge on the characteristics of vibration distribution in plunge pool slabs was analyzed, together with the correlation of the vibrations. The results show that the strongest vibration response occurs in the front (0+149m before dam) and decreases along the way. The asymmetry of water flow causes highly unequal distribution of vibration strength in slabs of different areas. Under normal operation, the plunge pool slabs vibrate randomly forced by flow load, with good correlation and stable dominant frequency between 0.6 ~ 1.7Hz. Because of the large scale vortex, the vibration has good similarity and synchronicity. The vibration strength increases stably with the increase of discharge amount, while the dominant frequency decreases slowly. When the discharge is more than 1500m3/s, the dominant frequency tends to decrease at low speed and become stable eventually.
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