eigenfrequency

Continuous transition between traveling mass and traveling oscillator using mixed variables

Submitted by Flavio Stochino on Tue, 10/06/2015 - 08:38

The interaction between cars or trains and bridges has been often described by means of a simplified model consisting of a beam loaded by a traveling mass, or by a traveling oscillator.Among others, two aspects are essential when dealing with masses traveling along flexible vibrating supports: (i) a complete relative kinematics; and (ii) a continuous transition between a traveling mass, rigidly coupled, and a traveling oscillator, elastically coupled with the support.

Natural Frequency Extraction in conjunction with UMAT in ABAQUS

Submitted by Vaibhav Yadav on Thu, 01/06/2011 - 23:13

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User subroutines in ABAQUS

UMAT

eigenfrequency

Hi,

We are using the user subroutine UMAT in ABAQUS for varying the material properties in a thin plate. For any static analysis this subroutine is working perfectly fine. However, while using UMAT during natural frequency extraction, ABAQUS is not completing the analysis and is giving a very vague following error message in the log file:

ABAQUS/CAE - How can I model a two-storey shear frame with rigid floors and LUMPED masses?

Submitted by buckholm on Wed, 02/18/2009 - 09:09

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This would seem like a simple task. Anyhow, I am having some trouble.

Problem description: I want to model a two-storey shear frame with rigid floors and lumped masses? I.e., in all its simplicity, a two-DOF system ignoring the mass of the columns and lumping the mass at the two rigid floor beams. A typical example in all books on structural dynamics.

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