This paper deals with the modeling of the engage and disengage operations of a helicopter rotor during which blades can come in intermittent contact with the droop or flap stops. The problem is formulated within the framework of finite element based flexible multibody dynamics that allows the analysis of rotorcraft systems of arbitrary topology with the potential of contact among various componens of the system. Contact is assumed to be of finite duration, and the forces acting between the contacting stops are explicitly computed during the simulation. The modeling of contact consists of three parts: the evaluation of the relative distance between the stops, a unilateral contact condition which is transformed into a holonomic constraint by the addition of a slack variable, and a contact model which describes the relationship between the contact force and the local deformation of the contacting bodies. The proposed analysis procedure is validated by comparison with experimental data, and the aeroelastic analysis of shipboard engage and disengage operations of a H-46 rotor is presented.
Multibody modeling of engage and disengage operations of helicopter rotors
Mehrkörperdynamik für Ein- und Auskuppeloperationen von Hubschrauberrotoren
Journal of the American Helicopter Society ; 46 , 4 ; 290-300
2001
11 Seiten, 18 Bilder, 34 Quellen
Article (Journal)
English
Hubschrauber , Rotor (Drehflügel) , intermittierender Betrieb , Aeromechanik , numerische Simulation , Rechenmodell , Finite-Elemente-Methode , dynamisches Verhalten , Kontakt (Reibung) , Randbedingung , Transformation (Mathematik) , Kontaktkraft , elastische Verformung , Theorie-Experiment-Vergleich , Validierung
Multibody Modeling of Engage and Disengage Operations of Helicopter Rotors
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