Aerodynamic estimation and trim analysis for a tethered balloon
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摘要: 从飞行力学分析的角度,用传统的气动力估算方式对具有倒"Y"型尾翼的系缆气球的气动力特性进行估算.考虑气球与系缆的综合系统,建立系缆气球平衡方程并进行配平计算.在不同的风速条件下,采用牛顿下降梯度法迭代求解非线性代数方程组形式的系缆气球平衡方程.通过不同风速及不同系缆位置的平衡状态的对比分析,确认系缆的最佳悬挂位置.Abstract: The aerodynamic characteristics of a tethered balloon with inverted "Y" fins were estimated by the traditional aerodynamic estimation from the flight dynamics analysis viewpoint. Taking into account the whole cable-body system, the nonlinear force trims equations and nonlinear moment trim equations were established and calculated. For the different wind speed, the equilibrium points could be got from the trim equations solving by Newton iteration method. Comparing the trim states of the different wind speed and different junction point of the cable, the better junction point of the rope could be confirmed.
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Key words:
- flight mechanics /
- aerodynamic forces /
- balloons /
- inverted "Y" fins /
- aerodynamic estimation
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