Aerodynamics Analysis of Helicopter Rotor in Flight Test Using Strain Gauge Sensors.

Area of Science:

• Aerospace Engineering
• Mechanical Engineering
• Applied Physics

Background:

• Accurate aerodynamic load data is crucial for helicopter design and performance.
• Current methods like simulations and wind tunnels have limitations in real-world flight conditions.

Purpose of the Study:

• To propose and validate a new method for measuring helicopter rotor aerodynamic loads in flight.
• To enhance the accuracy of aerodynamic load calculations for rotorcraft.

Main Methods:

• Strain gauge sensors were installed on rotor blades at various positions.
• Measured strains were integrated into blade flapping motion equations.
• A relationship between aerodynamic loads and flapping moment was established and utilized for calculation.

Main Results:

• The proposed method successfully measured rotor aerodynamic loads during flight.
• Calculated load distributions aligned with theoretical predictions.
• The in-flight measurement technique yielded more accurate results than simulations and wind tunnel tests.

Conclusions:

• The strain gauge-based flapping moment measurement offers a more precise approach to determining rotor aerodynamic loads.
• This method provides valuable data for helicopter rotor blade design optimization.
• In-flight measurements enhance the understanding of rotorcraft aerodynamics.