Analysis on stability and structure computation of helicopter with slung-load
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摘要: 针对特定的直升机吊挂载荷飞行任务,给出了吊挂几何构型的计算方法,计算了吊挂的几何参数和绳索内力,并在此基础上分析了飞行速度和吊挂重量对几何构型的影响.针对特定的飞行任务,考虑吊挂的几何尺寸和详细构型,在已有模型的基础上进行了改进和配平计算,配平结果与以前的结论吻合得很好,证明模型可用.计算并分析了不同速度、吊挂参数下系统的平衡和稳定特性.结果表明:带吊挂飞行的直升机,速度增加可以改善横向的螺旋不稳定,但对纵横向的周期模态都会产生不利影响.Abstract: Computing method is given of geometric structure of slung-load for specially designated flight mission.Using this method, the geometry and internal force of slung rope were estimated. The influence of velocity and slung weight on geometry of slung-load was analyzed. An improvement of some existing helicopter flight dynamical model with slung-load was presented by taking geometry and detailed structure of this specific slung into consideration, and the trim state had been calculated, with the result meets existing conclusion perfectly. The equilibrium and stability property of various velocities and slung parameters were computed and analyzed. The result tells that, for helicopter with slung-load, the increment of flight velocity can improve the instability of spiral mode, however, make periodic mode worse on both longitude and lateral.
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Key words:
- helicopter /
- slung-load /
- internal force /
- trim /
- mode
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