Direct Surge Margin Control for Aeroengines Based on Improved SVR Machine and LQR Method

Figure 9

Model precision test at 𝐻=4 km, 𝑀_𝑎=0.5.

(a) Test result of 𝛼(𝑘+𝑑) prediction model

(b) Relative test error of 𝛼(𝑘+𝑑)