近地面系留气球-缆绳复杂系统动力学建模方法

Dynamics Modeling of a Near-ground Tethered Balloon Cable System

为探究系留气球在近地面工作时缆绳系统以及整体动力学响应特性,提出了一种系留气球-缆绳复杂系统动力学建模方法.通过将系留缆绳离散为若干圆柱型刚体,并以轴套力进行连接,描述系留缆绳的柔性多体特性,对系留气球系统在稳态风环境、风廓线环境以及阵风环境下进行了系统动力学建模与仿真.开展了系留气球系统结构以及环境参数对系留气球运动姿态的影响量化分析.研究结果表明,600米高度的系留气球在相同外部载荷下,系留缆绳分段数为320段时,系统的运动响应特性较为理想.

It is difficult to perform dynamics modeling of tethered balloon system due to the flexibility of the cables and the complexity of the gust forces.In this work,we propose a novel modeling method for near-ground tethered balloon system to analyze its dynamic responses while considering complicated boundary conditions.The proposed dynamics model can describe the characteristics of the flexible cable when it suffers large translations and bending.A three-dimensional dynamics model to deal with the cou-pling of the tethered balloon system and flexible cables is developed based on the multibody dynamics theory.The dynamic responses of the tethered balloon system under complicated operating conditions are investigated.Finally,how the critical parameters affect the dynamic responses of the tethered bal-loon system is explored in details.The results indicate that the proposed dynamics modeling method of the tethered balloon system is effective.The motion responses of the system are the most stable when a 600 meter high tethered balloon has 320 segments of tethered cables under the same external loads.