Case Studies

ODS and Modal Test of a Vertical Pump

By Tony Dematteo, Emerson Process Management
Report (2264K), Report and Data (5951K)

In this Case Study, a vibration problem in a vertical pump is investigated. ODS and Modal tests were performed to identify the problem, then a correlated Finite Element model was used to determine a solution to the problem. This case study is an excellent example of how both experimental and analytical techniques can be used together to identify and solve vibration problems.

Using Operating Deflection Shapes to Detect Faults in Rotating Equipment ICCM

By Surendra N. Ganeriwala (Suri), Spectra Quest Inc. and Mark Richardson, Vibrant Technology, Inc.
Report

In this paper, we present three case studies of the use of operational deflection shapes (ODS’s) of a rotating machine as a means of detecting shaft misalignment and unbalance in its rotating components. Our purpose is to show that a significant change in the ODS can be used as an early warning indicator of mechanical faults in rotating machines.