Abstract
With the development of more/all electric aircraft, replacement of the traditional hydraulic servo actuator (HSA) with an electromechanical actuator (EMA) is becoming increasingly attractive in the aerospace field. This paper takes an EMA for a trimmable horizontal stabilizer as an example and focuses on how to establish a system model with an appropriate level of complexity to support the model-based system engineering (MBSE) approach. To distinguish the nonlinear effects that dominate the required system performance, an incremental approach is proposed to progressively introduce individual nonlinear effects into models with different complexity levels. Considering the special design and working principle of the mechanical power transmission function for this actuator, the nonlinear dynamics, including friction and backlash from the no-back mechanism, and the nonlinear compliance effect from the mechanical load path are mainly taken into consideration. The modelling principles for each effect are addressed in detail and the parameter identification method is utilized to model these nonlinear effects realistically. Finally, the responses from each model and experimental results are compared to analyze and verify how each individual nonlinearity affects the system’s performance.
Highlights
With the development of partly/fully electric aircraft, the application of power-bywire (PBW) actuations has received significant interest [1,2]
This research deals with a trimmable horizontal stabilizer actuator (THSA) for aircraft, which mainly functions for auxiliary pitch control [14,15]
According to signals sampled from sensors, such as the linear variable differential transducer (LVDT), rotary variable differential transducer (RVDT), etc., the Electrical motor control unit (EMCU) is in charge of fault diagnosis with specific strategies [16]
Summary
Wensen Zhang 1,2 , Jian Fu 1,2, *, Yongling Fu 1,2 , Jinlin Zhou 1,2 and Xudong Han 1,2. Laboratory of Aerospace Servo Actuation and Transmission, Beihang University, Beijing 100191, China
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