基于缩比模型的全尺寸飞机纵向Ⅰ类PIO预测

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 Category Ⅰ PIO of full-size aircraft is accurate based on scaled model test data.