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Learn About Vibrations!

Welcome!

The ABRAVIBE blog is where you find all the resources for learning more about vibrations. Browse and download examples for the free MATLAB/Octave ABRAVIBE toolbox. Or browse the many theory examples, videos, and resources for the book "Noise and Vibration Analysis: Signal Analysis and Experimental Procedures," by Anders Brandt!

Plexiplate Operating Deflection Shape (ODS) Example

ABRAVIBE Examples Posted on Mar 04, 2013 18:52

The ABRAVIBE example PlexiODS is an example using synthesized data
generated from a modal model of a Plexiglass plate (incidentally, by the
example called ForcedResponse) to illustrate operating deflection shapes
(ODS) analysis in ABRAVIBE. This is an advanced example including
multiple-reference ODS to be able to separate two close modes! The
example is divided into two parts, the first a single-reference technique
and the second an extended multi-reference technique.

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Forced Response Simulation Example

ABRAVIBE Examples Posted on Mar 04, 2013 18:49

The ABRAVIBE example ForcedResponse is illustrating the power of the digital
filter forced response method for computing forced response developed by
Kjell Ahlin and published in, among other references, “Noise and
Vibration Analysis: Signal Analysis and Experimental Procedures,” by
Anders Brandt. The method uses a modal superposition formulation using
a ramp invariant transform to formulate the forced response of each mode.
Also see inside the ABRAVIBE command timefresp for references to original
papers.

The example produces time data simulating a measurement of 35
displacement responses on a Plexiglass plate, when it is excited with
four forces in the corners of the plate. Mode shapes and eigenfrequencies
from a finite element model are used as a model for the plate.

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Universal File Import/Export Example

ABRAVIBE Examples Posted on Mar 04, 2013 18:47

The ABRAVIBE example UNVExamples contains a number of example MATLAB scripts illustrating the import and export capabilities of the ABRAVIBE toolbox. It contains three examples of reading universal files, and two examples of writing universal files. Test data as well as modal data are used both for
reading and writing.

The following examples are included:
ReadUnvEx1.m Read a universal file with test data into ABRAVIBE files
ReadUnvEx2.m Read a universal file with mode shape data into ABRAVIBE files
ReadUnvEx3.m Convert ABRAVIBE modal files into a structured file for animate
WriteUnvEx1.m Write a universal file with test data
WriteUnvEx2.m Write a universal file with modal data

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