Model-Based Failure Detection of a Trimmable Horizontal Stabilizer Actuator With Two Primary Load Paths


Betätigungssysteme und Aktuatoren



Art der Publikation:



Trimmable Horizontal Stabilizer Actuator (THSA); Active-parallel; Variable Displacement Hydraulic Motor (VDHM); Load Sharing; Failure Cases; Model-Based Failure Detection, Failure Isolation


Nils Wachendorf, Udo B. Carl, F. Thielecke



A novel drive concept is being designed and analyzed for a trimmable horizontal stabilizer within the framework of the third national research program (LUFO III). The stabilizer actuator is based on two parallel operating ballscrews. The positions of the ballscrew nuts are mechanically synchronized to avoid a force-fight between the drive sections. This mechanical synchronization is realized by a specific configuration of two differential gearboxes. The purpose of this project is to improve maintainability and incorporate an automatic testing capability for the mechanical integrity of the load carrying devices. Additionally, the mechanical wear of the heavily loaded components should be minimized and non-testable components should be eliminated. An approach for a model-based failure detection is presented in this article. A straightforward concept uses the sensor signals, which are needed for controlling the horizontal stabilizer to minimize the implementation effort. The detection of several mechanical failures is demonstrated by simulation.