CAJ | 학술논문

文章进行了干涉对海洋立管涡激振动影响的实验研究,实验分为立管前后排列和并肩排列两部分.立管间距为3~10倍直径,模型材料采用有机玻璃,长1.5 m,外径18 mm,壁厚2 mm,边界条件均为铰接,外流速分别从0.3~0.8 m/s,每级增加0.1 m/s. 通过在立管表面粘贴应变计获得动态应变数据,分别从立管的横向动态响应、振幅、频率等方面对前后排列、并肩排列立管以及和单独立管的实验数据进行对比研究. 结果表明,当有外流通过时,立管会受到其他立管尾流的影响,漩涡脱落引起的振动由于间距及排列方式的不同而显著不同,使得立管的动力特性、动力响应以及漩涡的脱落形式同单个立管相比均有较大的变化.
문장진행료간섭대해양립관와격진동영향적실험연구,실험분위립관전후배렬화병견배렬량부분.립관간거위3~10배직경,모형재료채용유궤파리,장1.5 m,외경18 mm,벽후2 mm,변계조건균위교접,외류속분별종0.3~0.8 m/s,매급증가0.1 m/s. 통과재립관표면점첩응변계획득동태응변수거,분별종립관적횡향동태향응、진폭、빈솔등방면대전후배렬、병견배렬립관이급화단독립관적실험수거진행대비연구. 결과표명,당유외류통과시,립관회수도기타립관미류적영향,선와탈락인기적진동유우간거급배렬방식적불동이현저불동,사득립관적동력특성、동력향응이급선와적탈락형식동단개립관상비균유교대적변화.
This paper presents experimental investigation concerning vortex-induced vibration of marine risers with interference. The arrangements of the risers involve tandem and side-by-side. Centre-to-centre distances from 3 to 10 diameters were studied. Model materials were made of plexiglass, with external di-ameters of 18 mm, wall thickness 2 mm and a total length of 1.5 m. Both risers are able to vibrate in the in-line and cross-flow direction through universal joints, the current velocity was varied from 0.3 m/s to 0.8 m/s, in increments of 0.1 m/s. Dynamic strain records were obtained through the dynamic strain gauges which were stick on the surface of the risers. The experimental data were contrastive studied by dynamic response of cross-flow direction, amplitude and frequency, respectively. The experimental results indicate that when the riser is in the wake of another, the oscillations induced by the vortex shedding are consider-ably modified and strongly depend on the distance of the two cylinders. Compared with the single riser, dy-namic characteristics, dynamic response and the form of vortex shedding are considerably modified.