Whirl Flutter of Turboprop Aircraft Structures

1: Introduction to aircraft aeroelasticity and whirl flutter

• Abstract
• 1.1 Scope of aeroelasticity
• 1.2 Static aeroelastic phenomena
• 1.3 Dynamic aeroelastic phenomena

2: Theoretical background of whirl flutter phenomenon

• Abstract
• 2.1 Physical principle
• 2.2 Propeller whirl flutter
• 2.3 Tilt-rotor whirl flutter

3: Whirl flutter occurrence in aerospace practice

• Abstract
• 3.1 Introduction
• 3.2 Lockheed L-188C Electra II
• 3.3 Beechcraft 1900C
• 3.4 Other aircraft

4: Experimental research on whirl flutter

• Abstract
• 4.1 Introduction
• 4.2 Early tests (1930s)
• 4.3 Main developments (1960s)
• 4.4 Recent activities
• 4.5 W-WING whirl flutter demonstrator

5: Analytical methods for whirl flutter investigation

• Abstract
• 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 gimballed 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

6: Application to the aircraft certification process

• Abstract
• 6.1 Requirements of the airworthiness regulations
• 6.2 Analytical approaches

7: Certification examples from aerospace practice

• Abstract
• 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