What is the difference between Operating Deflection Shapes (ODS) and Operational Modal Analysis (OMA)?

ODS = Motion of structure vibrating naturally (for example bridge vibration) or when excited by an unknown force (for example generator vibration).┬áProsig’s Structural Animation software performs ODS analysis.

OMA = Modal Analysis
Prosig’s Modal Analysis software performs OMA.

If an engineer were to animate a wire-frame model using a set of acceleration Transmissibility spectra, he would be viewing Operating Deflection Shapes (ODS).

If an engineer were to perform some analysis using the Prosig software Modal Analysis they would be said to be performing OMA.

OMA studies the damping factors and natural frequencies of a structure.
Additionally it is possible create an experimentally synthesised Modal FRF and then use Prosig’s Structural Animation to animate this data, this is also known as OMA.

The following two tabs change content below.

James Wren

Application Engineer & Sales Manager at Prosig
James Wren is an Application Engineer and the Sales Manager for Prosig Limited. James graduated from Portsmouth University in 2001, with a Masters degree in Electronic Engineering. He is a Chartered Engineer and a registered Eur Ing. He has been involved with motorsport from a very early age with special interest in data acquisition. James is a founder member of the Dalmeny Racing team.

Your email address will not be published. Required fields are marked *