Songtao Zhang | Harbin Engineering university china (original) (raw)
Address: Harbin, Heilongjiang, China
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The electro-hydraulic load simulator is an essential rig for the performance and stability test o... more The electro-hydraulic load simulator is an essential rig for the performance and stability test of aircraft rudder system. Its function is to reproduce, under laboratory conditions, the aerodynamic load of the rudder system. The model of electro-hydraulic load simulator is developed and the affecting factors of extraneous force are determined. To replicate the wide spectrum of aerodynamic load when the load spring stiffness varies within a definite bound, a loading controller is designed with H∞ mixed sensitivity approach. It's solved by the linear matrix inequality algorithm through selecting the suitable weighted functions. It's testified by experiments that the proposed controller can satisfy robust stability and robust performance when the load spring stiffness varies. It also can eliminate extraneous force and improve the passive loading performance with the compensation networks based on the structure invariance principle.
As a result of removing nonlinearity and uncertainty in the transform from fin angle to lift forc... more As a result of removing nonlinearity and uncertainty in the transform from fin angle to lift force, fin stabilizer with lift feedback can get better effect compare with that of angle feedback. But the effectiveness of lift feedback fin stabilizer can severely be deteriorated due to nonlinear and uncertainty effects arising from the parameter perturbations and external disturbances in the roll motion equation. A variable controller was introduced in this paper for its attractive features in deal with those parameters perturbation and disturbances. The performance of these variable structure controllers depends not only on its structure but also on the values of the controller's parameters. In this paper, an artificial immune system was used to tune the controller's parameters automatically to enhance performance of suppressing roll and reduce system chattering.
The electro-hydraulic load simulator is an essential rig for the performance and stability test o... more The electro-hydraulic load simulator is an essential rig for the performance and stability test of aircraft rudder system. Its function is to reproduce, under laboratory conditions, the aerodynamic load of the rudder system. The model of electro-hydraulic load simulator is developed and the affecting factors of extraneous force are determined. To replicate the wide spectrum of aerodynamic load when the load spring stiffness varies within a definite bound, a loading controller is designed with H∞ mixed sensitivity approach. It's solved by the linear matrix inequality algorithm through selecting the suitable weighted functions. It's testified by experiments that the proposed controller can satisfy robust stability and robust performance when the load spring stiffness varies. It also can eliminate extraneous force and improve the passive loading performance with the compensation networks based on the structure invariance principle.
As a result of removing nonlinearity and uncertainty in the transform from fin angle to lift forc... more As a result of removing nonlinearity and uncertainty in the transform from fin angle to lift force, fin stabilizer with lift feedback can get better effect compare with that of angle feedback. But the effectiveness of lift feedback fin stabilizer can severely be deteriorated due to nonlinear and uncertainty effects arising from the parameter perturbations and external disturbances in the roll motion equation. A variable controller was introduced in this paper for its attractive features in deal with those parameters perturbation and disturbances. The performance of these variable structure controllers depends not only on its structure but also on the values of the controller's parameters. In this paper, an artificial immune system was used to tune the controller's parameters automatically to enhance performance of suppressing roll and reduce system chattering.