A Hazard Analysis Based Approach to Improve the Landing Safety of a Blended-wing-body Remotely Piloted Vehicle

摘要

The BUAA-BWB remotely piloted vehicle (RPV) designed by our research team encountered an unexpected landing safety problem in flight experiments.It has obviously affected further research project for Blended-wing-body (BWB) aircraft configuration characteristics.Searching for a safety improvement is an urgent requirement in the development work of the RPV.Combining with vehicle characteristics, a new systemic method called System-Theoretic Process Analysis (STPA) has been imported to apply on the RPV flight experiment hazard analysis.An uncontrolled system behavior “path sagging phenomenon” is identified by implementing a 3 degree of freedom simulation based on wind tunnel experiment data and establishing landing safety system dynamics archetype, then a derived safety improvement requirement emerges. To obtain higher safety design effectiveness and considering safety design precedence, a new longitudinal control surface “belly-flap” is used to eliminate hazards in landing.Finally, Flight experiments show that the hazardous factor has been correctly identified and the landing safety has been efficiently improved.