M&B Engineered Solutions - Downloads & Resources

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Technical Papers & Presentations

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Applying Modal Analysis to Improve Machinery Reliability, by Stanley R. Bognatz, P.E. This paper will be presented at MFPT-2011 Conference on May 10th in Virginia Beach. Two case histories show how experimental modal analysis (EMA) and operating deflection shape (ODS) helped resolve structural dynamics that were difficult to visualize using standard vibration analysis techniques. We also show how accurate & detailed models help fully capture complex dynamic activity, and how combining ODS and transient speed vibration analysis can be used as an effective modal analysis substitute on turbo-machinery. The author also introduces the new concept of a Non-Operating ODS.
Turbine-Generator Balancing - Identifying Modally Effective Solutions, by Stanley R. Bognatz, P.E. This brief presentation reviews the essential considerations that must be taken into account for effective field balancing of turbo-machinery, including how to deal with rotor resonances ("criticals"). The use of the author's "Balancing-T" is also reviewed for effective weight angle selection on flexible rotors, and static-couple derivation is reviewed as a complement to transient speed analysis.
Transient Vibration Analysis - Insights into Machinery Behavior by Stanley R. Bognatz, P.E. This presentation was made at the December meeting of the Vibration Institute's Piedmont Chapter in Halifax, NC, during December 2007. It reviews the basic elements of transient speed vibration analysis, and how it can augment Predictive Maintenance / PdM analysis. Covered in the presentation are transient data plot types, slow roll compensation, resonance identification, amplification factor measurements, 1st and 2nd mode rotor balancing, shaft centerline movement, eccentricity ratio measurements, and more. Please contact the author for a copy of the full technical paper.	Slide Show
Optical Alignment, Thermal Growth and Machinery Movement by Stanley R. Bognatz, P.E. This presentation reviews Optical Alignment equipment and its application in the precise measurement of thermal growth and machinery movement, and how to achieve precision shaft alignment. Several case histories are reviewed showing how optical measurements were critical in achieving good machinery operation.	Slide Show
On-Line Monitoring Systems, by Timothy S. Irwin, P.E. This presentation discusses the various considerations in selecting and specifying a vibration monitoring system. Systems reviewed include continuous monitoring, polling / scanning, and transmitters.	Slide Show
Integrally Geared Centrifugal Air Compressor - Vibration Analysis Studies, by Timothy S. Irwin, P.E. This presentation discusses experience collecting and analyzing vibration analysis data on several different models and types of high speed air compressors.	Slide Show
Balancing a Generator at a Hydro Electric Plant by Gary W. Peterson, PPL Montana, LLC This article was prepared by on one of our clients and shows how vibration in a vertical hydro-turbine is affected by the changes in dynamic shaft support stiffness that result from changes in bearing clearance, and highlights the need to do root-cause analysis before balancing these types of machines.



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