考虑地面效应的超低空空投载机纵向稳定性评估方法

Evaluation Method of Longitudinal Stability of Ultra-low Altitude Airborne Aircraft Considering Ground Effect

地面效应引起的镜像涡系对超低空空投任务影响显著,文章在分析地面效应对某运输机纵向气动特性影响的基础上,研究了地面效应对某运输机静、动稳定性的影响。基于Routh-Hurwitz稳定性判据,推导了保证执行超低空空投任务的载机其稳定飞行的纵向气动导数范围。仿真验证结果表明,文章研究结论对提出执行超低空空投载机的任务性能指标和制定载机操纵品质指标具有重要参考价值。

The mirror vortex system caused by the ground effect has a significant influence on the ultra-low altitude airdrop mission. Based on the analysis of the influence of the ground effect on the longitudinal aerodynamic characteristics of a transport aircraft, the influence of the ground effect on the static and dynamic stability of a transport aircraft is studied. Based on the Routh-Hurwitz stability criterion, the longitudinal aerodynamic derivative range of the aircraft carrying out the ultra-low altitude airdrop mission is derived. The simulation results show that the conclusion of this paper has important reference value for carrying out the task performance index of the ultra-low altitude aircraft and establishing the control quality index of the aircraft.