Dynamic modelling enables solutions to be identified and tested
Sappi approached our Advanced Technology & Research Centre to undertake a vibration assessment and identify a solution. The machine line sits on two concrete frames, roughly 70m in length and 6m above ground level. Thermo rolls and profile controlled rolls are hanging freely in the space between the frames.
Our research team analysed the dynamic properties of the entire system and the dynamic excitation from the machines. By determining the natural frequencies of the paper machine line and calculating the resulting vibration speeds, the dynamic problems were quantified. We offered our client a number of potential solutions, from which Sappi chose to construct an additional wall between two columns to stiffen the concrete frame. Once the machines were installed and operating, we took measurements of the actual vibrations to verify our calculations. The solution worked to keep vibrations at acceptable levels.
“In Royal HaskoningDHV we found the right partner who was able to give us a clear view for decisions on measures to reduce cost intensive risks. They worked out different possible solutions by analysing vibration effects on a complex system with rotating masses. We appreciate the structured approach to meet the objectives,” said René Melcher, Project Manager / Technologist, Sappi.
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