南水北调与水利科技
南水北調與水利科技
남수북조여수리과기
SOUTH-TO-NORTH WATER
2013年
1期
60-65
,共6页
水垫塘底板%原型观测%振动特性%相关性分析
水墊塘底闆%原型觀測%振動特性%相關性分析
수점당저판%원형관측%진동특성%상관성분석
plunge pool slab%prototype observat ion%vibration characteristics%correlation analysis
利用官地水垫塘底板泄洪振动响应原型观测成果,分析了不同泄洪工况下底板振动强度的分布特征,同时应用现代谱分析方法,从频域的角度分析了底板泄洪振动的频域特征,并研究了不同泄洪工况及流量对底板振动特性的影响,以及各测点的相关性.结果表明,在官地水电站底流消能的情况下,位于消力池内前段(坝前0+149 m)这一区域的板块振动响应最为剧烈,之后沿程减弱.水流的不对称流动和摆动,引起底板不同区域的板块振动强度分布规律产生显著差别.正常运行下的水垫塘底板是在水流荷载作用下的随机受迫振动,各测点的振动相关性较好,底板整体性也较好,且优势频率非常稳定地分布在0.6~1.7 H z之间.水垫塘内涡旋尺度较大,底板振动本身有着很好的相似性和明显的同步性.随着泄洪流量的增大,正常运行下的底板振动强度平稳增强,优势频率缓慢下降,且当泄流量高于1500 m3/s后,优势频率随泄流量增大而下降的速度趋于缓慢,并最终趋于稳定.
利用官地水墊塘底闆洩洪振動響應原型觀測成果,分析瞭不同洩洪工況下底闆振動彊度的分佈特徵,同時應用現代譜分析方法,從頻域的角度分析瞭底闆洩洪振動的頻域特徵,併研究瞭不同洩洪工況及流量對底闆振動特性的影響,以及各測點的相關性.結果錶明,在官地水電站底流消能的情況下,位于消力池內前段(壩前0+149 m)這一區域的闆塊振動響應最為劇烈,之後沿程減弱.水流的不對稱流動和襬動,引起底闆不同區域的闆塊振動彊度分佈規律產生顯著差彆.正常運行下的水墊塘底闆是在水流荷載作用下的隨機受迫振動,各測點的振動相關性較好,底闆整體性也較好,且優勢頻率非常穩定地分佈在0.6~1.7 H z之間.水墊塘內渦鏇呎度較大,底闆振動本身有著很好的相似性和明顯的同步性.隨著洩洪流量的增大,正常運行下的底闆振動彊度平穩增彊,優勢頻率緩慢下降,且噹洩流量高于1500 m3/s後,優勢頻率隨洩流量增大而下降的速度趨于緩慢,併最終趨于穩定.
이용관지수점당저판설홍진동향응원형관측성과,분석료불동설홍공황하저판진동강도적분포특정,동시응용현대보분석방법,종빈역적각도분석료저판설홍진동적빈역특정,병연구료불동설홍공황급류량대저판진동특성적영향,이급각측점적상관성.결과표명,재관지수전참저류소능적정황하,위우소력지내전단(패전0+149 m)저일구역적판괴진동향응최위극렬,지후연정감약.수류적불대칭류동화파동,인기저판불동구역적판괴진동강도분포규률산생현저차별.정상운행하적수점당저판시재수류하재작용하적수궤수박진동,각측점적진동상관성교호,저판정체성야교호,차우세빈솔비상은정지분포재0.6~1.7 H z지간.수점당내와선척도교대,저판진동본신유착흔호적상사성화명현적동보성.수착설홍류량적증대,정상운행하적저판진동강도평은증강,우세빈솔완만하강,차당설류량고우1500 m3/s후,우세빈솔수설류량증대이하강적속도추우완만,병최종추우은정.
@@@@Based on the protot ype observation results of the vibration response of plunge pool slabs in t he Guandi hydropow er stat ion, t he distribution of vibration strength of slabs had been analyzed under different spillw ay conditions. Meanw hile, the f re2 quency domain characteristics of the sluice vibration of slabs w ere analyzed from the aspect of frequency domain using t he mod2 ern spectral analysis method, and the effects of different sluice conditions and flow discharges on the vibration characteristics of slabs in plunge pool were studied. T he correlation betw een different measuring points was also analyzed. The results show ed that the most intensive vibrat ion response is located in the forepart ( 0+ 149 m) of the pow er consum ption pond under t he con2 ditions of underflow energy dissipation in t he Guandi hydropow er station and t he vibrat ion response decreases along the w ay. The asymmetrical water flow caused different vibration strengt h dist ributions in different areas of the slabs. T he slabs in the plunge pool vibrated random ly forced by the water flow load under the normal operation. The correlation betw een each measur2 ing point w as remarkable and the dominant frequency was stably dist ributed between 01 6 and 11 7 Hz. The scale of vortex w as very large in the plunge pool and thus the vibration of slabs had good similarit y and synchronicity. With the increasing of flow discharge, the vibration strength of the slabs increased as w ell under the normal operation while t he dominant f requency de2 creased st ably. When the flow discharge was more than 1 500 m3/s, the decreasing rate of dominant frequency tended to be slow and eventually stayed stable.
