风切变场中直升机前飞状态动态响应

为解决复杂风切变场中直升机运动的数值仿真,把握非线性直升机模型在风场中的响应特性,建立了一维、二维的风切变模型,采用直升机非线性飞行动力学模型,考虑直升机的控制系统,用四阶龙格－库塔法数值仿真直升机在风场中的前飞运动.对水平风和铅垂风的各个梯度场对响应的影响进行比较.结果表明,水平风和铅垂风的各个梯度场对响应的影响是不同的,此研究中二维空间的组合梯度场构成更为危险的飞行环境;在不同的情况下其作用是不可忽略的,尤其注意在低空飞行状态下对直升机飞行性能的影响.也进一步说明此数值仿真法对非线性直升机模型在复杂风场中响应研究实用有效.

Helicopter dynamic response to wind shear in forward flight

In order to solve the problem of numerical simulation of the helicopter motion in wind shear and study the characteristics of the helicopter dynamic response to wind shear, one-dimensional and two-dimensional wind shear models were set up, nonlinear system mathematical model of helicopter flight dynamics was concerned with the consideration of the control system and Runge-Kutta method was used to simulate the forward flight. It shows that different wind gradients of longitudinal air velocity have different impacts on major parameters dynamic response of helicopter and every kind of wind gradients should not be neglected in different situations, particularly, in the situation involved here, the most dangerous environment comes from the integral two-dimensional wind shear model, and the impact on helicopter in the low-attitude flight should be noted. It also shows that this numerical simulation method works effectively in the study of dynamic response to complicated wind shear of helicopter nonlinear system mathematical model