State-of-the-art Experimental Techniques for VTOL Structural Dynamics

Increasing complexity in modern aircraft systems and structures makes it challenging for engineers to develop aircraft within time and budget constraints. This is particularly true in the context of new Vertical Take-off and Landing (VTOL) vehicle development where many disruptive aircraft configurations are being studied. Ground and flight testing help to validate aircraft structural dynamic performance and prove that the aircraft meets certification requirements. Several experimental techniques have been developed lately to help getting deeper insight into aircraft structural dynamics and are helpful to accelerate the verification and certification process of new VTOL vehicles. Some of these methods have been recently industrialized and are available in commercial hardware and software solutions. This includes techniques for contactless measurements based on digital image correlation as well as methods for accelerated modal testing and identification of non-linearities in aircraft structures. These methods are presented here and positioned in the context of accelerated VTOL aircraft development.