Execution of an experimental modal analysis which revealed potential resonance issues on a fin fan oil cooler before commissioning at a petroleum refinery. A finite element analysis helped develop a fix before the unit was ever started.
- Problem Statement (Challenge)
- What (type of machine): Petroleum Refinery Fin Fan Oil Cooler Structure
- Where (State/ Country): Pennsylvania
- Why (problem/reason): Identify potential problematic modes near the relevant excitations for the cooler assembly before commissioning
- Work Performed
- Results/ Solution
- Findings: Group of modes were identified within 15% of the 1x and 2x fan running speed, represented a significant risk of resonance condition that could result in vibration related reliability issues.
- Impact: Finite Element results indicated that adding cross bracing as shown resulted in separation margins greater than 15% separation. The proposed modification provides a practical level of protection relative to vibration related reliability issues due to a resonance condition.
Baseline FEA calibrated to match field data.
Yellow struts were modifications implemented before commissioning to eliminate resonance.
