Flutter Analysis of Large Aspect Ratio Wing — Lesson 4

This lesson covers the complex topic of flutter analysis of a wing with a large aspect ratio. It explains the assumed mode method and how to calculate the bending and torsion frequencies of a wing. The lesson also discusses the importance of natural frequencies and mode shapes in the industry, and how these are obtained through FEM analysis. It further elaborates on the concept of large aspect ratio and how it affects the bending and torsion of a wing. The lesson also touches upon the use of Rayleigh Ritz principles to obtain natural mode shapes. Towards the end, the lesson delves into the topic of panel flutter, explaining the difference between viscous damping and structural damping, and how these concepts apply to the flutter problem of a wing.

Video Highlights

01:00 - Calculation of the bending and torsion frequencies.
07:14 - Explanation of the Lagrange’s equation.
11:12 - Discussion on the kinetic energy equation.
19:13 - Explanation of the structural damping and viscous damping.
42:23 - Discussion on the panel flutter.
65:10 - Discussion on the non-linear flutter.

Key Takeaways

- The assumed mode method is crucial in flutter analysis of a wing with a large aspect ratio.
- Natural frequencies and mode shapes play a significant role in the industry, and are obtained through FEM analysis.
- The concept of large aspect ratio affects the bending and torsion of a wing.
- Rayleigh Ritz principles are used to obtain natural mode shapes.
- Panel flutter is a complex topic that involves understanding the difference between viscous damping and structural damping.