9 ODS/Modal
Topics covered in this chapter:
• ODS/Modal overview
• Manage jobs
• Sensors and inputs
• Tachometers
• Set up the plots
• Set up the job
• Collect ODS/Modal data
• Display the data for a ODS/Modal measurement point
• Print an ODS/Modal plot to AMS Machinery Manager
• Print an ODS/Modal plot to a memory card
9.1 ODS/Modal overview
The ODS/Modal program lets you collect cross-channel ODS and Modal data. Modal analysis
is the process of determining the modal characteristics, including natural frequency, mode
shape, and damping of an elastic structure. ODS stands for operating deflection shape. Use
a dual or four channel analyzer for ODS testing. For more efficient data collection, use the
four-channel analyzer with four sensors or a single accelerometer and triax sensor. Collect
two, three, and four channel waveform and spectra data (ODS data only) or two, three,
and four channel impact data (Modal data only).
An ODS is the deflection of a structure at a particular frequency. However, an ODS can be
any forced motion of two or more points on a structure. Specify the motion of two or more
points to define a shape, which is the motion of one point relative to all others. Motion is a
vector quantity that has location and direction, which is also called a Degree of Freedom
(DOF). The magnitude of the frequency when resonance occurs depends on the
distribution of mass (weight) and stiffness of a structure.
You need to collect phase and magnitude data. The analyzer formats the data for use with
ME'scope VES
â„¢
. Upload the data to AMS Machinery Manager Data Transfer, view the data
from Vibration Analysis, and then export the data to ME'scope VES
â„¢
for analysis. The
Advanced Cross Channel program is included with all two and four channel CSI 2140
analyzers.
To use the ODS/Modal program:
1.
Create a job or activate a saved job. You must use a job to save your data.
2. Set the tachometer or sensor.
3. Set up the plots.
4. Set up the job and its data collection parameters.
ODS/Modal
MHM-97432 Rev 7 275
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