摘要
通过分析飞机纵向扰动运动的物理成因及受扰动后飞行参数的变化,对飞机的纵向小扰动运动方程进行简化并进行拉普拉斯变换,给出了纵向短周期模态的简化传递函数。结合某型飞机飞行品质试飞数据采用极大似然法参数辨识技术对短周期模态特性参数进行辨识,计算了飞机短周期频率和阻尼比,并按照固定翼飞机飞行品质GJB185-86对飞机的短周期模态特性指标进行评定,结果表明简化传递函数合理有效,模型参数辨识结果准确,飞机纵向短周期模态特性达到GJB185-86一级飞行品质的要求。
Based on the analysis of the physical causes of aircraft longitudinal disturbance motion and the change of flight parameters after disturbance,the aircraft's longitudinal small disturbance motion equation is simplified and Laplace transform is carried out,and the simplified transfer function of longitudinal short period mode is given.Based on the flight quality test data of a certain type of aircraft,the short period modal characteristic parameters are identified by the maximum likelihood method,and the short period frequency and damping ratio of the aircraft are calculated.The short period modal characteristic index of the aircraft is evaluated according to the flight quality GJB185-86 of the fixed wing aircraft.The results show that the simplified transfer function is reasonable and effective,and the model parameter identification result is accurate.The longitudinal short-period modal characteristics of the aircraft meet the first-class flight quality requirements of GJB185-86.
出处
《科技创新与应用》
2022年第1期18-20,共3页
Technology Innovation and Application
关键词
短周期模态
极大似然法
参数辨识
飞行试验
short period mode
maximum likelihood method
parameter identification
flight test
