Method for real-time estimation of aeroelastic flutter using the parametric flutter margin

An exemplary parametric flutter margin method and associated system that can be used to identify the structural dynamic characteristics of an Unmanned Aerial Vehicle’s wing in a series of Ground Vibration Tests (GVTs) and initial flight-testing study.

The Need

In the aerospace industry, ensuring the safety and certification of aircraft is of paramount importance. One critical challenge faced during the certification process is aeroelastic flutter, an unstable phenomenon that can lead to catastrophic consequences. Conventional flight-testing methods involve subjecting aircraft to higher dynamic pressures close to flutter onset, risking potential damage and instability. As the industry embraces the certification of Unmanned Aerial Vehicles (UAVs) and Urban Air Mobility (UAM) vehicles with unique configurations, there is a growing demand for a safe and accurate flight-test methodology that positively identifies flutter margins without exposing the aircraft to flutter. Addressing this need is crucial to enhance aircraft safety and support the development of innovative aerial technologies.

The Technology

Our groundbreaking technology, the Parametric Flutter Margin (PFM) method, offers a cutting-edge solution to accurately identify the flutter margins of aircraft without the need for hazardous high-pressure flight conditions. The PFM method involves adding a stabilizing mass ahead of the elastic axis of the aircraft's lifting surface, enabling data collection at flight conditions exceeding the nominal aircraft's flutter boundary. Utilizing a self-contained electro-mechanical excitation system and advanced Frequency Response Functions (FRFs), the PFM method allows for precise analysis of an aircraft's aeroelastic system at the flutter onset speed, eliminating the need for extrapolation to higher velocities. By combining numerical simulations and physical experiments, the PFM method provides a reliable and safe means to assess an aircraft's flutter characteristics during both ground vibration tests and flight-testing.

Commercial Applications:

  • Certification of Unmanned Aerial Vehicles (UAVs): Ensure the safe and reliable certification of UAVs with unique configurations for commercial operations, promoting the growth of the drone industry.
  • Urban Air Mobility (UAM) Vehicle Certification: Support the certification of UAM vehicles with innovative designs, enabling efficient and safe urban air transportation.
  • Aircraft Safety Enhancement: Enhance aircraft safety by accurately identifying flutter margins, leading to the development of more robust and reliable aircraft designs.


  • Enhanced Safety: By enabling flutter margin identification without subjecting the aircraft to hazardous flight conditions, the PFM method significantly enhances aircraft safety during the certification process.
  • Efficient Certification: The PFM method streamlines the certification process by providing accurate flutter data, reducing the need for extensive and risky flight-testing campaigns.
  • Innovation Support: With the ability to certify unique aircraft configurations, the PFM method encourages innovation and the development of advanced aerial technologies.
  • Accurate Flutter Prediction: The PFM method's close agreement with Finite Element Analysis (FEA) predictions ensures accurate flutter onset velocity estimation, enhancing confidence in the aircraft's structural dynamics.

Embrace the future of aerospace certification with our revolutionary Parametric Flutter Margin (PFM) method. Enhance safety, accelerate certification, and drive innovation in the rapidly evolving aviation landscape. Contact us at [Contact Information] to learn more and explore how our technology can benefit your aerospace endeavors.

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