A NEW METHODOLOGY FOR THE ESTIMATION OF STRUCTURAL LOAD LEVEL DUE TO COMPLEX UNSTEADY AERODYNAMIC EXCITATION

摘要

To assess the structural load level due to unsteady aerodynamic excitation involved in specific aircraft configurations is challenging in many respects. The ability to find the most critical structural response covering the entire flight envelope is one of the main concerns together with the ability to provide accurate loading conditions. Stalls are part of these non-standard cases where the random nature of buffet loads on the aftbody may lead to potentially high structural responses in a probabilistic sense. The multistep process leading to reliable structural response estimation in stall conditions is described in this paper with an emphasis on the new experimental and computational methodologies that have been set up at Dassault Aviation. This process is successfully applied on a generic business jet for which recorded inflight loads are well predicted thanks to the new "dual approach" based on wind tunnel data and Detached Eddy Simulation computations.