Perception Model Supports the Analysis of Vestibular Illusions in Flight Accidents

摘要

TNO and Boeing developed a "Spatial Disorientation Identification Tool" (SDiT) to support the investigation of recorded aircraft motion for its potential to induce Spatial Disorientation (SD). The tool is based on a perception model that consists of transfer functions representing the dynamics in the vestibular system (semicircular canals and otoliths) and their neural interaction. We extended this perception model with an algorithm to identify different vestibular illusions from the computed mismatch between the perceived and actual aircraft orientation. The model is integrated in a graphical user interface that allows the user to control the analysis, for example by adjusting some of the model parameters within validated ranges. The interface also shows an animation of the actual and perceived aircraft attitude. SD illusions that are being recognized by the tool are the "somatogyral illusion," resulting from erroneous perception of aircraft rotations; and the "somatogravic illusion," resulting from ambiguities between linear accelerations and attitude. The tool was validated using recordings of basic flight maneuvers, and also with data of an actual Loss of Control In-flight (LOC-I) accident Combined with other data, e.g., control inputs, the SDiT can help to make sense of pilot actions in accidents and incidents.