直升机机动飞行逆仿真研究

对直升机典型机动飞行做逆仿真数值计算与分析.逆仿真中采用了较为复杂的非线性飞行动力学模型,包括非均匀入流、机身非线性气动力以及包含机身运动耦合的旋翼挥舞运动与作用力模型.提出了与非线性模型相适应的逆仿真算法,并将组合迭代方法用于求解广义非线性代数方程组.对跨越障碍(pop-up)和180°水平转弯(level turn)机动进行机动性描述.以某型直升机为例,对跨越障碍和180°水平转弯两种典型的机动动作进行逆仿真计算与分析.

Inverse Simulation for Helicopter Maneuvering Flight

Inverse simulation and analysis of the representative maneuvering flight for the current helicopter are presented.The more sophisticated nonlinear model of flight dynamics,which include non uniform inflow model,nonlinear aerodynamics of fuselage,rotor flap motion and forces coupling with the motion of helicopter body,is considered in inverse simulation.The algorithm of inverse simulation is proper to the above nonlinear model,and the assembled iteration method is used to solve generalized nonlinear algebraic equations.The representative maneuvering flight of pop up and 180 degrees lever turn are described into mathematical expressions.For a sample current helicopter,the inverse simulation is calculated and analyzed for the maneuvers of pop up and 180 degrees lever turn.