Initial results provided on the same day
Using as-built documentation and pictures supplied, we created a 3D calculation model of the structure on which to base the first assessment. The results were sent to our client that evening. Due to the urgency, we used linear elastic modelling which is faster, and interpreted the results based on our knowledge and expertise.
This provided a quick initial assessment of what was happening, why there were vibrations and where they came from. We discovered that one of the mills operated with a frequency close to the natural frequency of the floor. This caused the floor to resonate which resulted in excessive movement of both the machine and the floor.
Downtime kept to minimum through fast response
It was clear that the vibrations were localised and we recommended a variety of local strengthening measures. Having kept our client informed with progress from the Friday when we were first approached and throughout the weekend, we were able to agree which of these measures would be best on the Monday morning.
Within just two weekdays the factory was back in operation. Our client then supplied subsequent measurements so we could check the solution performed as expected. This confirmed our measures had solved the problem and that no further investigations were necessary.
To avoid this issue arising at future plants, we wrote a set of guidelines for distribution across our client’s organisation to standardise their global approach.
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