Detailed guidance (with example) on how to plot coupled mode shapes
Category: Linearisation & Campbell diagram
Problem
At present there is no coupled mode viewer in supported versions of Bladed. Yet it's a common requirement to be able to view coupled mode shapes. Is there a workaround?
Solution
Versions of Bladed affected: 4.0 onwards. From 4.8 onwards, this only applies to tower modes.
Article last updated: 30 Mar 2023.
The information needed to reconstruct coupled modes is in the .$01 file and the .$PJ file generated during a Campbell diagram run.
Please refer to this KB article for background.
There is a downloadable zip package here (link) which contains worked example files for a simple demo case that allows the user to construct coupled modes for the tower. It also helps users to understand how the uncoupled modes are combined together.
It does not provide a solution to showing coupled modes for the entire turbine.
Keywords coupled modes; Campbell; mode shapes