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M&B
utilizes Vibrant Technologies ME’scopeVES software to perform modal and
operating deflection shape (ODS) analyses of both machinery and plant
structures to identify and correct vibration, fatigue and noise problems.
An ODS study is often the first step in
identifying a structure’s vibratory patterns. It involves gathering
vibration data from a series of points on a structure, and then coupling
this data to a 3-Dimensional model of the structure within the VES software.
We can then see how a machine or structure is moving by animating the
spatial data directly from the time or frequency domain responses.
An ODS shows how your machine or structure is
moving, and whether or not there are excessive vibration levels. By
animating the ODS's of a structure in slow motion, you can see what can't be
seen any other way; a structure's overall motion and the motion of one part
relative to another. Excessive vibration levels and loose or damaged parts
are easily identified from an ODS display.
Beyond ODS analysis, we can perform
experimental modal analysis studies of the same structures. By introducing a
measured excitation source such as a calibrated force hammer or dynamic
shaker, and measuring the structure’s responses, we can derive the
structures modal mass, stiffness and damping parameters. By using a variety
of curve fitting and parameter estimation techniques, this allows further
identification of resonance frequencies, and is particularly useful for
separating closely coupled resonant modes that would be difficult to
otherwise identify.
Once the mode shapes and
resonant frequencies are identified, they can be correlated to any
problematic vibration frequencies.
This allows our engineers to help design modifications to reduce vibration,
noise and fatigue.
As part of the analysis &
reporting process, digital movies are created of problematic modes, and are
easily shared
being in the Microsoft AVI format. These files can be emailed to clients,
embedded in Word documents and PowerPoint presentations, etc., and offer an
excellent method of understanding structural responses that is easily
understood by both management and engineering personnel.
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