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The application of electric actuator in aircraft is increasing due to the concept of more electric aircraft. The electrical trimmable horizontal stabilizer actuator (ETHSA) is also a type of electric actuator, which is a significant part of the aircraft flight control system. There has been a lot of research on the modeling of ETHSA, but few of them focus on the fault detection and isolation(FDI). In this article, the bond graph model of each component is derived and the full model of ETHSA is obtained firstly. Then establish diagnostic model, analyze the redundancy relations and building the fault signature matrix. Simulation results verify the FDI of ETHSA is feasible based on 20-sim simulation environment.

In the aircraft’s flight control system, the trimmable horizontal stabilizer actuator (THSA) is used to balance the aircraft’s pitch attitude, which is an important part for safety. In this paper, system scheme of an electrical type of THSA is firstly described and then the power transformation and multidisciplinary model are analyzed. Finally, the simulation analysis under different duty cycle are carried out in virtual simulation environment AMESim. The simulation results verify the accuracy of the established model and show the dynamic performance of the actuation system under various working conditions.

The trimmable horizontal stabilizer actuator (THSA) is a key part of the aircraft flight control system. This paper focuses on the new electrical type of THSA. System structure and control scheme are firstly introduced and then the mathematical models of its key components are established. The bond graph method is used for system-level modeling and component-level modeling for easily analysis of the power and signal transformation. Finally, the simulation analysis is carried out in 20-sim virtual simulation environment. The result verifies the basic performance for control design and shows the extendibility of the proposed models.

In this paper, taking the planetary roller screw for aircraft electro-mechanical actuator as the research object. The planetary roller screw exist four different designs which are widely used for different applications: these four designs are respectively known as standard planetary roller screw, inverted planetary roller screw, recirculating planetary roller screw and differential planetary roller screw. The composition, thread form, working characteristics and applicable occasions of these four different designs are analyzed and compared. Considering the possible relative slide between components, the angular and axial motion relationships are demonstrated in detail, and the relationships of structural parameters between components were obtained. The force analysis was performed at the contact point to analyze the transmission efficiency. The relation between the transmission efficiency and contact angle, helix angle was also deduced in consideration of the rolling friction and the relative sliding friction of the component. The results show that the transmission efficiency of the planetary roller screw rapidly increases with the increase of the helix angle and then gradually decreases. In addition, the efficiency gradually increases with the increase of the contact angle, and finally tends to be stable.