Elastic Multibody Models of Transport Aircraft High-Lift Mechanisms

Abstract

DOI: 10.2514/1.37583 In development of transport aircraft high-lift systems, the application of commercial simulation tools is widely used. This paper provides a short overview of parametric modeling of the mechanisms of the high-lift system of a transport aircraft as an elastic multibody system. Elastic mechanical components are modeled by means of the method of finite elements. The high-lift mechanisms comprise the leading-edge devices (droop nose, slats) and thetrailing-edgedevices(flaps).Aftergivingsomedetailsofthetheoreticalbackgroundofelasticmultibodysystems, the specificmodels of the high-lift mechanisms are described. Simulation results of representative parameter studies demonstrate the application of the model. Some failure cases are also investigated in addition to an operating load case. Nomenclature D = deformation tensor F = force F = load vector f = modal load vector G = constraint matrix g = residuals of implicit constraints K = stiffness matrix M = mass matrix N = modal matrix q = modal coordinates � q = eigenvector q � = Craig–Bampton coordinates r = position vector u = physical displacement vector v = velocity vector � = Euler angles = strain vector � = eigenvalue � = reaction force coordinates � = stress vector � = modal matrix ! = angular velocity vector