Whirl Flutter of Turboprop Aircraft Structures

1. Introduction to aircraft aeroelasticity and whirl flutter

1.1 Scope of aeroelasticity

1.2 Static aeroelastic phenomena

1.3 Dynamic aeroelastic phenomena

2. Theoretical background of the whirl flutter phenomenon

2.1 Physical principle

2.2 Propeller whirl flutter

2.3 Tilt-rotor whirl flutter
References

3. Whirl flutter occurrence in aerospace practice

3.1 Introduction

3.2 Lockheed L-188C Electra II

3.3 Beechcraft 1900C

3.4 Other aircraft
References

4. Experimental research into whirl flutter

4.1 Introduction

4.2 Early tests (1930s)

4.3 Main developments (1960s)

4.4 Recent activities

4.5 W-WING whirl-flutter demonstrator
References

5. Analytical methods for whirl flutter investigation

5.1 Historical overview

5.2 Fundamental solution

5.3 Influences of major parameters

5.4 Propeller aerodynamic forces by strip theory

5.5 Lift lag effect

5.6 Blade lift curve slope and Mach number effects

5.7 Correction to number of propeller blades

5.8 Influence of wing flexibility

5.9 Influence of hinged blade flexibility

5.10 Influence of gimbaled propeller flexibility

5.11 Influence of twisted blade flexibility

5.12 Propeller aerodynamic forces by lifting surface theory

5.13 Model of coupled bending blades

5.14 Complex models for tilt-rotor applications

5.15 Rear fuselage-mounted engines

5.16 Two-bladed propellers
References

6. Application to the aircraft certification process

6.1 Requirements of the airworthiness regulations

6.2 Analytical approaches
References

7. Certification examples from aerospace practice

7.1 Single nose-mounted engine utility aircraft

7.2 Twin wing-mounted engine utility aircraft

7.3 Twin wing-mounted engine commuter aircraft with tip-tanks
References

Nomenclature
Index