Content deleted Content added
Modal testing methods missing in the article. Added different methods with basic description of each type. |
m v2.04b - Bot T19 CW#25 - Fix errors for CW project (Heading hierarchy) |
||
Line 22:
Different types of modal testing can be performed.
Experimental Modal Analysis tests can be performed both in the field and in more controlled lab environments. Testing in the lab has the advantage of a higher signal-to-noise ratio (SNR) and the ability to easily change the test setup. When performing EMA testing, objects are excited by artificial forces and both the inputs (excitations) signals and outputs (responses) signals are measured and used to estimate Modal Models.
Operating Deflection Shapes is a simple way to do dynamic analysis and see how a machine or a structure moves by its operational conditions. ODS tests have no applied artificial forces and only response vibration signals are measured.
Line 32:
ODS is used successfully for machine conditioning monitoring and in civil engineering applications e.g. on bridges, buildings, and other structures that are difficult to excite by applied artificial forces.
The test and measurement procedure for Operational Modal Analysis is similar to ODS, but their analysis part is different. Both ODS and OMA do not use external input forces but are based purely on response DOF measurements.
| |||