Natural frequency of aircrafts

[LesslieJohn]

Hi

How can you find the natural frequency of an aircraft? It would be of great help if anybody can give me an idea of how to go about the problem.

[D H]

How can you find the natural frequency of an aircraft? It would be of great help if anybody can give me an idea of how to go about the problem.
The natural frequency of what? The fuselage? The wings? The control surfaces? The fuel sloshing about?

This is not a question that can be answered in any satisfactory way on an internet forum. The way you go about solving this problem is to become a mechanical or aeronautics engineer. Along the way you will have to take multiple classes, read multiple books, learn how to use multiple tools.