Performing vibration troubleshooting, testing and analysis services, and subsequent design modifications on equipment – ensuring structural integrity, minimizing risk and controlling costs for owners/users.
Most vibration problems on equipment are due to thermal, mechanical, acoustic, or flow related excitation – and if left unchecked, will cause equipment failure, which may lead to greater repair costs. Components vibrate at particular natural frequencies. These frequencies and resulting mode shapes can be modal and vibration analysis. Often, simple analysis can be performed, while for more complex systems, finite element analysis is performed to determine the dynamic response.
A vibrating component or system often leads to fatigue – which eventually leads to equipment malfunction, or catastrophic failure. Fatigue cracks usually initiate at the surface, and for this reason, the condition of the surface and the environment are important factors influencing fatigue behavior.
Tom O’Donnell performs vibration, fatigue and failure analysis to ASME and other relevant Codes. Bill O’Donnell Sr. currently serves as the Chairman of the Subgroup of Fatigue Strength of the ASME Boiler and Pressure Vessel Code.
Fatigue analysis is performed per ASME Section III Class 1 and Section VIII Division 2. The fatigue design life evaluation procedures in Section III of the ASME Boiler and Pressure Vessel Code were originally developed in the U.S. Naval Nuclear Program. Those involved were Bill O’Donnell, (Bernie) Langer, W.E. (Bill) Cooper and James (Jim) Farr – who, in the late 1950’s and early 1960’s developed the initial formulation of this technology in the Tentative Structural Design Basis for Reactor Pressure Vessels and Directly Associated Components, which became known as “SDB-63.”
Section III of the ASME Code “Vessels in Nuclear Service” was the first to include specific Code rules to prevent low cycle fatigue failure. Its first edition was published in 1963; Section VIII, Division 2, “Alternate Rules for Pressure Vessels” followed in 1968.
- Welded Assemblies
- Lifting Devices
- Power Generation
- Pumps & Valves
- Rotors & Shafts
- Medical Equipment
- Electronic Equipment
We perform vibration analysis – as well as fatigue & failure analysis on components for clients in industries including energy, manufacturing and petrochemical.
Our analysis includes:
- Response Spectrum
- Dynamic Design Analysis Method (DDAM)
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