ARJ21飞机抖振升限特性研究及运行裕度分析

Research on Buffet Ceiling Characteristics and Operational Margin Analysis of ARJ21 Aircraft

抖振是一种飞机各部件在飞行中发生振动的现象,威胁飞行安全。现利用ARJ21飞机配套性能软件PES仿真计算多种运行重量、推力状态、速度条件下的升限,分析了低、中、满上座率条件下飞机在气动和推力限制及节油速度升限。结果表明:在M0.4-M0.69区间内,节油速度升限要远小于气动和推力限制的抖振升限,安全裕度高;而在M0.69-M0.82区间内,节油速度升限随速度增加而逐渐逼近气动和推力限制的抖振升限直到相交,且重量越重逼近趋势越明显,交点对应的升限高度越低,安全裕度也越低。

Buffeting is a phenomenon in which various components of an aircraft vibrate according to the natural frequency of the structure during flight,posing a great threat to flight safety.The performance evaluation software(PES) is used to simulate and calculate the ceiling of the ARJ21aircraft under various operating weights,thrust states and speed conditions and analyses the aircraft's corresponding ceiling of aerodynamic limitations,thrust limitations and fuel-saving speeds under low occupancy,medium occupancy and full occupancy conditions.The results show that:in the Mach number range of M0.4-M0.69,the ceiling of the aircraft flying at a fuel-saving speed is much smaller than the buffet ceiling of the aircraft under aerodynamic limitations and thrust limitations,and the safety margin is higher.In the Mach number range of M0.69-M0.82,the ceiling of the aircraft flying at fuel-saving speed gradually approaches the buffet ceiling of the aircraft under aerodynamic limit and thrust limit as the speed increases until they intersect,and the heavier the weight,the more obvious the approaching trend,the lower the ceiling height corresponding to the final intersection point and the lower the safety margin.