Summary
Concerns regarding aeolian vibration on the Hjørundfjorden fjord crossing motivated a vibration monitoring campaign combined with a revision of the damping system. The 3.27 km span comprises four phases with nominally identical conductor and damping arrangements, while maintenance records indicate a higher occurrence of damper fatigue on phases exposed toward the open fjord. Accelerometers were installed on all phases in May 2025, enabling direct phase-to-phase comparison. The monitoring period coincided with ongoing damper replacement. The results show that vibration behaviour on very long fjord crossings can be phase-dependent even with similar damping layouts. While additional dampers reduced vibration activity on phase C, differences between other phases persisted despite identical configurations. High-energy events are influenced by wind direction and terrain-related aerodynamic effects and, under certain conditions, are associated with multi-planar conductor motion. The study highlights the complexity of aeolian vibration on long-span fjord crossings.
Read more Read lessThis paper demonstrates that on very long fjord crossings, aeolian vibration behaviour can be strongly phase-dependent due to aerodynamic and terrain effects, even when conductor type and damping layouts are nominally identical. Full-phase monitoring reveals mechanisms that single-phase measurements may miss.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B2_11872_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Norway |
| Study committees | |
| File size | 2 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
ADUM Boris - Statnett SF; DUARTE DE OLIVEIRA Pedro F. - PLP; MATENE Elhacene - PLP; PARADIS Jean-Pgilippe - PLP
Keywords
Health Assessment, Refurbishment, Maintenance, Aeolian Vibration, Damping, Conductor Motion, Crossing, Fjord, Monitoring, Wind, Enhancing Lifespan.
