Looking for tutorial for Steady State Dynamics

General Questions
1

I want to do a very simple example.
Make a horizontal beam: length(x) 1000mm, width(y) 20mm, height(z) 10mm
Material: uniform steel
Applied forces: 1000N in z direction at 0,0,0 face. 1000N in z direction at 1000,0,0 face.
No displacement constraints.
No gravity.
Expected answer: Beam should vibrate while accelerating upwards. When the transient vibrations die down the beam deformation should behave like beam pinned at one end and simply support at the other end and under uniform gravity. It is still accelerating upwards, but the deformation is steady.
Can STEADY STATE DYANMICS find the steady deformation without doing the transient calculations?

My attempt with Dynamics
https://askoh.com/misc/acceleratingBeam.pmx

Thanks. Aik-Siong Koh

2

The SSD procedure can only analyze steady-state vibrations due to sinusoidal excitation in a given frequency range and provides results in the frequency domain. Here’s an example of modeling a single DOF system: https://www.youtube.com/watch?v=dLkmF7UesgE

You could also check the examples done in Abaqus because CalculiX is based on it and even shares almost the same syntax.

But without BCs, the first few modes around 0 Hz will be rigid body modes. You will also get unrealistic jumps at natural frequencies.

acceleratingBeam SSD.pmx (182.3 KB)

Let’s maybe stay at the CalculiX forum where I’m replying as Calc_em. Your problem is more about CalculiX itself.