Hi,
I understand that you want to know the basis on which mode shapes are scaled in 'Modal Analysis of a Simulated System and a Wind Turbine Blade'.
The scaling of mode shapes in this context is typically done to make the mode shapes from different sources comparable. Mode shapes from finite element models are usually mass-normalized, meaning that the mode shapes are scaled such that the modal mass equals 1. In contrast, experimental mode shapes are often scaled so that the maximum deflection is 1 for ease of visualization and comparison.
For each mode shape vector, the component with the largest absolute value is scaled to 1, and the rest of the components in the vector are scaled accordingly. This is done so that the mode shapes from different analyses or different modes can be easily compared on the same scale.
Refer to the following example from MathWorks documentations to get an idea of how to use this application:
I hope this resolves your issue.
