The sideslip angle sensor is used to augment the dutch-roll mode frequency. This signal is mixed with the inertial angle of the sideslip to wash out turbulence. If the sideslip sensor is inoperative, its signal is replaced with acceleration signals from the IMU. The dutch roll sensor is as high as possible for small sideslip values during maneuvering. The yaw damper is fed with the gravity-corrected yaw rate, for an equivalent sideslip angle. The equations are
$$\hat{\dot{\beta}}=r_e-\frac{g}{V}\sin\mu\cos\gamma\approx\dot{\beta}$$
Vertical force is neglected due to structural mode characteristics. The yaw damper gains are scheduled wrt experimental axes with AOA, Mach number and dynamic pressure.
Sources
- “Realization of the Eurofighter 2000 Primary Lateral/Directional Flight Control Laws with Differential PI-Algorithm.” Accessed: Feb. 10, 2024. [Online]. Available: https://arc.aiaa.org/doi/epdf/10.2514/6.2004-4751
Backlinks
[[Dutch Roll]]
[[Dynamic Pressure]]
Eurofighter Flight Control Laws
Gain Scheduling
[[Mach Number]]
[[Structural Mode Control System]]
[[X-38 Sideslip Estimation]]