系留气球升空过程的动态模拟

Dynamic Simulation of Ascending Tethered Balloon

采用有限元方法,建立了系留气球的多质点动力学模型,研究了风场中某型系留气球的动态升空过程。模型中将柔性大变形的系留绳离散成若干绳段,各绳段假设为质量集中在端点的阻尼弹簧,各节点的运动由相应绳段的重力、气动力和张力确定。通过数值模拟给出并分析了系留气球轨迹、系留绳释放速度、张力、长度、形状和水平漂移距离等参数的变化规律。与国外典型算例进行对比,结果表明该模型对系留气球升空过程中的参数变化有较好的预测能力,对系留气球的释放控制有一定的指导作用。

Based on the finite element method, a multi-mass dynamic model of a tethered balloon is developed to simulate the dynamic ascending process of a certain tethered balloon in a wind filed. The large eccentric flexible tether is discreted into a number of nodes. Each node is modeled as a mass damping spring. The motion of each node is determined by the tension, aerodynamic force and gravity of that spring. The dynamic characteristics of the trajectory, release speed, tensile force, length, shape and horizontal drift distance are provided, and the ana- lysis calculation is also made. Compared with the results of similar numerical examples from abroad, this method exhibits better prediction ability in the parameter perturbation of a tethered balloon during ascending, and this is of value to ~uidin~ the release control of the tethered balloon.