Towards Mission Readiness – Applying the Objective Motion Cueing Test to the Apparent Vertical Filter

Abstract

Flight training simulators have a limited capability to replicate aircraft motion cues because the space envelope of current motion systems impedes a better fidelity and urges the user to make sometimes painful compromises. Therefore, it is all the more important to use the given space envelope as well as possible. But this trivial consideration yields an answer to the question what "good" means and therefore what strategy shall to be pursued by a control algorithm. For the Apparent Vertical Filter (AVF) this means that the amount and direction of the force combined with the corresponding rotational velocity shall be met as long as the given space envelope allows that approach. If this is not possible anymore the direction of the specific force shall be reproduced correctly. Only if both, the rotational and the translational cueing cannot be achieved a decision must be made. This is the case e.g. for the side force during a taxi turn on ground. During such maneuvers a compromise needs to be found between a correct specific force and a limited rotational velocity of the simulator. Within this paper the working principle of the Apparent Vertical Filter will be discussed for a taxi turn on ground maneuver. Furthermore, it will give a general overview of the AVF response to lateral maneuvers in general. Finally, it presents the results for the lateral tests of the Objective Motion Cueing Test (OMCT) showing that, in general, the AVF is able to meet the requirements of the test.

Don’t Touch! Using the NISER Method to Avoid Reaching the Space Envelope Limits of a Hexapod System

“…This paper proposes an alternative method currently used in the DLR research simulator AVES (Air Vehicle Simulator). It complements the in-house developed Apparent Vertical Filter (AVF), a Motion Drive Algorithm (MDA) given by [23]. During the tuning sessions for a simulator campaign it turned out that without such a function the MDA needs to be much further restricted due to a very small number of aggressive maneuvers.…”