Spring is not compressed in Nastran

Autodesk Support

Oct 8, 2023

Products and versions covered

Issue:

When simulating spring as a Connector in Nastran it seems the spring is not compressed. Creating a coordinate system for the spring gives the same results.

Solution:

When viewing the results in Nastran, springs may look like they are not moving, but it is only displaying (in reality, springs are calculated properly). 


Example:

image.png

The stiffness of a spring is k = 20N/mm. The compression force acting vertically is F = 100N (the gravity is omitted). The total displacement due to compression should be x = 5mm (from the equation F = k*x).

Results from Nastran:

image.png

The spring is compressed by 5mm in accordance with manual calculations.
 

Products:

Inventor Nastran;

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