Professor Stuart George Bradley
MSc, PhD (Auckland), FIoA, FRMetS
Research | Current
Turbulence induced noise
Wind-generated acoustic noise in cellular phones or headphones is often the major cause of signal dropout. We use 'quiet' wind tunnels and derive theoretical turbulence-acoustics models based on deriving semi-empirical scaling laws. Funding is by leading European electronics companies.
- Wind Noise in Microphones
Design of new acoustic instruments for remotely-sensing winds and turbulence
We design new SODARs (acoustic equivalent of a RADAR) to bounce sound off turbulent patches in the atmosphere to obtain profiles of wind and turbulence. Current applications are in cities and the Antarctic; flow around wind turbines; and visualising the vortices from landing aircraft.
- Antarctic SODAR array
- High Resolution Wind Profiles
Urban atmospheric environments
Understanding the mechanisms of urban environments is becoming increasingly important for climate change studies and sustainability. Within the 'street canyons' heat and pollutants can be trapped. Our acoustic remote sensing instruments are being used in collaborations with several European groups doing urban studies
- New Measurement Technology for profiling the Urban Boundary Layer
Wind energy optimisation
With increasing size of turbines, an alternative to instrumented masts is urgently required for monitoring turbine performance. We are working with wind energy interests in EU-funded projects to validate use of acoustic remote sensing SODARs for this purpose throughout Europe.
- Calibration of SODAR for Wind Energy Applications
- Use of SODAR in Wind Turbine Performance Measurements
- Visiting Professorship, Manchester UK
- Visiting Professorship, Vienna Austria
Selected publications and creative works (Research Outputs)
- Legg, M., & Bradley, S. (2017). Low frequency highly directional air coupled ultrasound sensor. 24th International Congress on Sound and Vibration, ICSV 2017.
- Bradley, S., Mikkelsen, T., von Hünerbein S, & Legg, M. (2016). Wind turbine noise source characteristics measured with a large microphone array. In F. Miyara, E. Accolti, V. Pasch, N. Vechiatti (Eds.) Proceedings of the 22nd International Congress on Acoustics Buenos Aires.
- Legg, M., & Bradley, S. (2016). Measurement of stiffness of standing trees and felled logs using acoustics: A review. The Journal of the Acoustical Society of America, 139 (2), 588-604. 10.1121/1.4940210
- Cashbaugh, J., & Bradley, S. (2016). Evaluation of a Spray Scheduling System. Paper presented at 5th IFAC Conference on Sensing, Control and Automation Technologies for Agriculture (AGRICONTROL), Seattle, WA. 14 August - 17 August 2016. IFAC PAPERSONLINE. (pp. 5). 10.1016/j1facol.2016.10.042
- Bradley, S. (2015). An analytic model for the success rate of a robotic actuator system in hitting random targets. Sensors (Basel), 15 (11), 29346-29362. 10.3390/s151129346
- Chabbey, A., Bradley, S., & Porte-Agel, F. (2015). Scale model evaluation and optimization of sodar acoustic baffles. Journal of Atmospheric and Oceanic Technology, 32 (3), 507-517. 10.1175/JTECH-D-13-00253.1
- Bradley, S. (2015). Wind turbine amplitude modulation noise due to time-dependent interference. Acoustics 2015 Hunter Valley.
- Bradley, S., & Emeis, S. (2015). ISARS 2014 special issue. Meteorologische Zeitschrift, 24 (6), 545-546. 10.1127/metz/2015/0743