Surrey S. Helicopter rotor loads prediction and validation based on a fully nonlinear aeroelastic method: Diss. ... Dr. Ing. / Deutsches Zentrum für Luft- und Raumfahrt, Institut für Aeroelastik, Göttingen. - Köln: DLR, 2017. - xi, 129 p.: ill. - (Forschungsbericht; 2017-12). - Bibliogr.: p.111-117. - ISSN 1434-8454 Шифр: (Pr 1120/2017-12) 02  Место хранения:   01 | ГПНТБ СО РАН | Новосибирск

Оглавление / Contents

List of Figures ................................................ VI List of Tables ................................................ VII Nomenclature ................................................... IX 1 Introduction ............................................... 1 1.1 Motivation ................................................. 2 1.2 Literature survey - Aeroelastic rotor load prediction ...... 3 1.2.1 Structural rotor blade dynamics ..................... 4 1.2.2 Analysis of helicopter rotor aeroelasticity ......... 5 1.3 Research Objectives ........................................ 9 2 Numerical methods ......................................... 11 2.1 Multibody Dynamics ........................................ 11 2.1.1 Flexible bodies in MBS ............................. 12 2.1.2 Finite element interface of SIMPACK ................ 16 2.2 Finite element modeling ................................... 18 2.3 The Computational Fluid Dynamics solver TAU ............... 18 2.4 Tight coupling methodology ................................ 19 2.4.1 Trim method ........................................ 23 2.5 Comprehensive rotorcode HOST .............................. 25 3 Analysis of the 7A and 7AD structural blade dynamics ...... 27 3.1 Rotor blade geometry ...................................... 27 3.2 Ground vibration testing .................................. 27 3.3 Modeling of the structural blade dynamics ................. 32 3.3.1 1-D finite element model ........................... 32 3.3.2 3-D finite element model ........................... 32 3.3.3 Integration of the finite element models into SIMPACK ............................................ 35 3.4 Validation of the non-rotating blade dynamics ............. 37 3.5 Validation of the rotating blade dynamics ................. 41 3.6 Summary of the structural dynamics ........................ 47 4 Aeroelastic simulation of the 7A and 7AD helicopter rotor ..................................................... 49 4.1 European wind tunnel campaigns ............................ 49 4.2 CFD mesh setup of the rotor simulations ................... 52 4.3 Numerical simulation of the 7A rotor in high-speed forward flight ............................................ 53 4.3.1 Rotor airload prediction ........................... 55 4.3.2 Structural blade loads ............................. 59 4.3.3 Rotor blade motion ................................. 66 4.3.4 Summary of the coupled 7A rotor simulation in high-speed forward flight .......................... 69 4.4 Numerical simulation of the 7A rotor in high thrust forward flight ............................................ 70 4.4.1 Rotor airload prediction ........................... 73 4.4.2 Structural blade loads ............................. 84 4.4.3 Summary of the coupled 7A rotor simulation in high thrust forward flight ......................... 91 4.5 Numerical simulation of the 7AD rotor in cruise flight .... 92 4.5.1 Rotor airload prediction ........................... 93 4.5.2 Structural blade loads ............................. 98 4.5.3 Rotor blade motion ................................ 103 4.5.4 Summary of the coupled 7AD rotor simulation in cruise flight ..................................... 104 5 Summary and Conclusions .................................. 107 5.1 Assessment of the rotor load prediction accuracy ......... 110 5.2 Perspective .............................................. 112 References .................................................... 113 Appendix ...................................................... 121