Wind turbine noise and vibration measurement on tall towers
Xi Engineering Consultants has developed an on tower noise and vibration measurement method that keeps engineers safely on the ground while capturing high quality data from modern turbines with hub heights well over 100 metres.
The Challenge
Wind turbines present a demanding environment for measurement. Their height, exposure, high voltages and moving plant all create additional risk when planning surveys. These challenges are amplified when measurements are required on live, operational assets where health and safety rules prevent personnel from remaining in the tower during operation.
As modern turbines grow taller, with many new machines exceeding 100 metres hub height, asset owners and OEMs still need accurate noise and vibration data to diagnose issues, validate designs and demonstrate compliance with noise limits. The question is how to obtain reliable, high resolution measurements across the full height of the tower and nacelle without compromising safety, causing excessive downtime or incurring the cost of repeated climbs.
Our Approach
Xi has created a proven on tower measurement system that allows comprehensive vibration and noise data to be gathered while engineers remain safely on the ground during turbine operation. The method has been refined over many projects, from small turbines where the nacelle is only accessible by external ladder or lowering the tower, through to some of the world’s tallest hybrid towers at around 140 metres.
Each project begins with careful planning and a safety focused installation phase. While the turbine is shut down, Xi’s working at height and offshore certified engineers deploy sensors and cables along the tower and across the nacelle. A cable network is routed from the base of the turbine to the nacelle, with a main control hub positioned at the tower base where recordings can be managed clear of moving parts and high voltage equipment. Intermediate data acquisition nodes are installed at selected elevations, creating a flexible architecture for connecting accelerometers, microphones or other sensors at all key locations.
Once sensors are in place and checked, the engineers descend the tower. The turbine is then run through normal and diagnostic operating conditions while the measurement system captures synchronous data from all points. The architecture is fully expandable, supporting multiple local nodes over hundreds of metres and sampling rates up to 10 kHz, so Xi can record detailed dynamic behaviour of the entire structure and drivetrain in a single campaign.
Because the system can accept almost any sensor type and be adapted to different turbine designs, Xi is able to tailor each deployment to the specific objectives of the project, whether that is diagnosing tonal noise, assessing structural response, validating a model or providing evidence for a noise complaint investigation. At every stage, the process is designed to keep time spent at height to a minimum while maintaining data quality.
The Results
Why it matters
As turbines become larger and more remote, operators and manufacturers still need clear insight into how their assets behave in the field. Traditional approaches that rely on personnel working at height during operation are increasingly difficult to justify from a safety, cost and logistics perspective.
By combining a carefully engineered cable and data acquisition network with working at height expertise, Xi offers a practical way to measure noise and vibration on modern wind turbines without compromising safety or data quality. The same approach can be adapted for offshore turbines, hybrid towers and repowering projects, supporting fault diagnosis, noise compliance, model validation and long term asset management.