伺服小翼对小型共轴式直升机操稳特性的影响

The Effect of Bell-Hiller Stabilizer Bar on a Small-Scale Coaxial Helicopter Stability and Control

运用经典的叶素法和一阶谐波理论,推导了计入气动干扰的伺服小翼挥舞动力学方程,建立了带有伺服小翼的小型共轴式直升机飞行动力学模型,以在研的某小型共轴式无人直升机为研究对象,通过数值法计算了该型直升机的稳定性导数和操纵导数。结合直升机的飞行试验,分析了不同安装形式的伺服小翼对小型共轴式直升机的稳定性和操纵性的影响。研究表明:伺服小翼对小型共轴式直升机的稳定性和操纵性有较大的影响,不同安装形式的伺服小翼对直升机的影响不同,其中采用上旋翼加装伺服小翼的直升机操稳特性较好。

A linearized mathematical model of a small scale coaxial helicopter with the Bell-Hiller stabilizer bar is extracted from numerical linearization of a non-linear mathematical model with the help of a small perturbation theory. With the study of a small scale coaxial helicopter, stability and control derivatives are computed by the numerical method, to analysis effect of the different types of the Bell-Hiller stabilizer bar on the coaxial helicopter stability and control. The study indicates that helicopters with the stabilizer bar fixed on the upper rotors have better canabilitv on stabilitv and control.