连续体覆冰导线模型的舞动实验研究

Experimental Investigation on the Galloping of Iced Transmission Line as a Continuum

建立了适合连续体覆冰导线舞动实验的专用风洞,以连续体单跨覆冰单导线模型为实验对象,采用激光传感器测量了导线不同位置处的位移响应,得到了导线在不同风速下的舞动振型,利用力传感器得到了导线舞动时的动张力。结果表明:覆冰导线在来流风场作用下进行舞动,在随风速增大的过程中先后经历了两个大幅舞动阶段,一阶模态和二阶模态在两个阶段中分别被激发;动张力幅值与舞动幅值基本成正比,动张力频率包含导线模型舞动频率的一倍频和二倍频。在大风速时,导线模型的舞动为多阶模态的耦合振动,在舞动过程中无固定的波峰和结点。

A transmission a continuum different pos correspondin transmission special wind tunnel which is suitable for experimental study of continuous iced line galloping was established. Taking the single span of single iced transmission line （as model） mode as experimental object, the displacement responses of transmission line at g ons were measured by laser transducers; the galloping modes of transmission line to different wind speeds were obtained; the dynamic tension force of galloping ne was obtained by force transducers. Results show that iced transmission line is swaying due to the action of incoming wind flow, during the process of wind speed increasing, it has experienced two large swaying amplitude stages; the first and the second order modes are excited in the two stages respectively; the amplitude of dynamic tension force is proportional to the amplitude of swaying amplitude; the dynamic tension force frequency includes transmission line model swaying frequency and its double frequency. When wind velocity is very high, the galloping is composed by the coupled vibration of multiple order modes, and there are no fixed peaks and nodes in galloping.