考虑系留点垂向运动的飞艇系缆响应特性分析

Analysis of the response of the tethered airship cable considering the vertical movement of the mooring point

为研究考虑系留点垂向运动的飞艇系缆的面内运动响应特性,将运动的飞艇作为系缆的边界条件处理,对系缆下端的系留点受到垂向激励时的系留飞艇系缆的运动状态进行了数值模拟,研究了系缆的动张力、运动情况。分析了飞艇攻角、系缆线密度等参数对系统的影响。研究结果表明:当系留点竖向简谐运动时,系缆上各点都做近似的简谐运动,在不同的线密度和攻角参数下,系缆各点的法向振幅分布不同,系缆可能处于二阶的振动状态;且随着系缆密度和攻角的增大,切向振幅增大,法向振幅减小;系留点激励还引起整个系统偏离平衡位置,这会引起飞艇动态高度的降低,在系留飞艇的高度控制中会有一定的影响。以上研究结果可为系留在舰船等运动中平台上的飞行器控制和系缆设计提供参考。

To study the in-plane motion response characteristics of the tethered airship cable during the mooring point motion, the force and motion of the airship is taken as the boundary condition to simulate the response of the cable under the motion of the mooring point, then the dynamic tension and motion of the cable is studied, as well as the impact of the airship’s angle of attack and cable density. Results obtained show that when the mooring point is vertically harmonically moving, the points on the cable are simply harmonically moved approximately. Under different angles of attack and linear density the motion amplitude distributions of the cable are different, and the cable may be in the state of second-order vibration. As the cable density and airship’s angles of attack increase, the tangential amplitude increases and the normal amplitude decreases. The mooring point excitation reduces the dynamic height of the airship, which may have a certain impact on the height control of the mooring airship. The results may provide reference for tether design and airship control which is tied to ships and other platforms.