Research
Infrasonic is actively involved in research based projects which aim to not only provide solutions to acoustic and vibration problems but also to improve the knowledge base of the field of study.
If you have any interesting ideas or if you are looking for a research partner, please contact us at: research@infrasonic.ie
20/10/2008: Infrasonic is awarded of an Innovation Voucher (SEE HERE) by Enterprise Ireland.
The issue to be solved was measurements of noise at wind speeds up to 12 m/s, as required by best practice guidelines for noise surveys at wind farms. However, BS4142 states that wind shields are effective up to 5m/s whereas most wind turbines are operative for wind speeds between 4m/s and 20m/s. Initially the effect of using a windshield on a microphone was established in both flow and no flow environments. This involved both wind tunnel tests and field tests. In the instances where hydrodynamic noise is an issue (i.e. a “windy†environment), the effect of exceeding the 5m/s limit was also quantified. These measurements provided a means to determine correction factors associated with wind speeds and may ultimately yield an improved wind shield design. This would also enable Infrasonic to contribute to the development of a future ISO standard procedure for measuring environmental noise.
The issue to be solved was measurements of noise at wind speeds up to 12 m/s, as required by best practice guidelines for noise surveys at wind farms. However, BS4142 states that wind shields are effective up to 5m/s whereas most wind turbines are operative for wind speeds between 4m/s and 20m/s. Initially the effect of using a windshield on a microphone was established in both flow and no flow environments. This involved both wind tunnel tests and field tests. In the instances where hydrodynamic noise is an issue (i.e. a “windy†environment), the effect of exceeding the 5m/s limit was also quantified. These measurements provided a means to determine correction factors associated with wind speeds and may ultimately yield an improved wind shield design. This would also enable Infrasonic to contribute to the development of a future ISO standard procedure for measuring environmental noise.
24/08/2009: Dr.King presents a study on performances of wind shields at Inter-Noise 2009, Ottawa, Canada.
The issue of correctly assessing and monitoring wind farm noise is growing in importance as the number of wind farms in operation continues to rise, in an effort to increase the production of green energy. Consequently the issue of correctly monitoring and predicting wind noise has become an issue of more importance in Ireland. According to best practice guidelines this involves noise measurements at wind speeds up to 12m/s. However, international standards generally state that microphone wind shields are only effective up to 5m/s whereas most wind turbines are operative for wind speeds between 4m/s and 20m/s. A reliable method to measure noise in high speed winds is therefore required. This paper describes an initial step towards this goal. The effect of using a windshield on a microphone was established in both flow and no flow environments. In the instances where hydrodynamic noise was an issue(i.e. a "windy" environment) the effect of exceeding the 5m/s limit was analysed. It is proposed that this work could contribute to the development of correction factors associated with wind speeds and these correction factors could then be applied to field measurements (Download the full paper HERE).
The issue of correctly assessing and monitoring wind farm noise is growing in importance as the number of wind farms in operation continues to rise, in an effort to increase the production of green energy. Consequently the issue of correctly monitoring and predicting wind noise has become an issue of more importance in Ireland. According to best practice guidelines this involves noise measurements at wind speeds up to 12m/s. However, international standards generally state that microphone wind shields are only effective up to 5m/s whereas most wind turbines are operative for wind speeds between 4m/s and 20m/s. A reliable method to measure noise in high speed winds is therefore required. This paper describes an initial step towards this goal. The effect of using a windshield on a microphone was established in both flow and no flow environments. In the instances where hydrodynamic noise was an issue(i.e. a "windy" environment) the effect of exceeding the 5m/s limit was analysed. It is proposed that this work could contribute to the development of correction factors associated with wind speeds and these correction factors could then be applied to field measurements (Download the full paper HERE).
