吊装缆索气动干扰致气弹失稳研究

A study on aerodynamic interference-induced instability of hoisting cables

以吊装缆索的气动干扰致气弹失稳现象为研究背景,设计制作了考虑垂度效应以及气动外形相似的吊装缆索气弹模型。通过风洞试验,分析了缆索间距对吊装缆索气动干扰的临界失稳风速、振动频率以及运动轨迹等振动特性的影响,对比了双缆索体系和三缆索体系气动干扰致气弹失稳的差异。研究表明:当两根缆索串列布置时,下游缆索受上游缆索尾流干扰,发生了明显的尾流驰振,而上游缆索受下游缆索气动干扰不明显,气动稳定性较好,几乎不发生振动。当三根缆索串列布置时,不仅下游缆索受上游缆索尾流干扰发生气弹失稳,上游缆索也同样受下游缆索气动干扰而发生振动。双缆索与三缆索气动干扰致气弹失稳振动特性差异明显。

Based on the research background of the aerodynamic interference-induced aeroelastic instability of a hoisting cable,an aeroelastic model of the hoisting cable considering the sag effect and similar aerodynamic shape was designed and fabricated.Through a wind tunnel test,the influence of cable spacing on the vibration characteristics of the critical instability wind speed,vibration frequency and motion trajectory of the aerodynamic disturbance of the hoisting cable was analyzed,and the difference of aeroelastic instability caused by aerodynamic interference of the double-cable system and the triple-cable system was compared.The results show that when the two cables are arranged in series,the downstream cable is disturbed by the wake of the upstream cable,and the wake vibration is obvious,while the upstream cable is not obviously disturbed by the downstream cable,and the aerodynamic stability is good,and there is almost no vibration.When the three cables are arranged in series,not only the downstream cable is disturbed by the wake of the upstream cable and the air elastic instability,but the upstream cable is also vibrated by the aerodynamic interference of the downstream cable.There is a significant difference in the instability and vibration characteristics of the pneumatic bomb caused by the aerodynamic interference of the double cables and the triple cables.