基于缩比模型的全尺寸飞机纵向Ⅰ类PIO预测

Prediction of longitudinal Category Ⅰ PIO of full-size aircraft based on scaled model

驾驶员诱发振荡(PIO)对飞机的飞行安全构成严重威胁,在进行全尺寸飞机PIO特性评估飞行试验之前,利用与全尺寸飞机动力学相似的缩比模型进行飞行试验,对全尺寸飞机的PIO特性进行初步评估,可以达到节约试验成本和降低试验风险的目的。针对驾驶杆操纵到指令形成过程中的时间延迟这一因素诱发的纵向Ⅰ类PIO,选取带宽准则和Neal-Smith准则作为评定准则,分析了全尺寸飞机和缩比模型对应PIO评定参数的相似比例关系,并建立了基于缩比模型的全尺寸飞机纵向Ⅰ类PIO预测方法。以某型军用运输机及其缩比模型作为算例飞机进行了仿真验证,验证结果表明:分析得到的相似比例关系是正确的,基于缩比模型试验数据可以较为准确地评估全尺寸飞机的Ⅰ类PIO特性。

The Pilot Induced Oscillations(PIO)pose a serious threat to the flight safety of aircraft.Predicting the PIO of full-size aircraft preliminarily based on flight test of dynamically similar scaled model helps to reduce the test risks and save cost.Bandwidth criterion and Neal-Smith criterion are selected as the evaluation criteria for the longitudinal Category Ⅰ PIO caused by the time delay from control stick operation to control command generation.The similar proportional relations of the PIO characteristic parameters between full-size aircraft and scaled model are analyzed first,and then a method to predict longitudinal Category Ⅰ PIO of the full-size aircraft based on scaled model is established.Finally,a military transport aircraft and its scaled model are taken as the sample aircraft of simulation verification.The results show that the similar proportional relations obtained by analysis are correct,and the prediction of CategoryⅠPIO of full-size aircraft is accurate based on scaled model test data.