When the wind turbines are built, documenting the noise consequences for the adjacent area is required. FORCE Technology measures and calculates wind turbine noise and prepares accredited reports as documentation for the public authorities.

Independent consultancy on wind turbine noise

If you need to get the installation of a wind turbine approved – large or small, new or old – we can calculate the noise impact of the project and prepare the required documentation for the public authorities’ processing of application about the project.

We have a long tradition of cooperating with companies in the energy sector, including assistance related to local plans in the form of environmental impact assessments (EIA), and noise reduction and action plans for compliance with noise limits.

During the planning phase, we calculate the noise contributions impacting the neighbours using the wind turbine manufacturer's sound power level of the wind turbine or wind turbines, in the case of a wind farm.

Benefit from our expertise on wind turbine noise

As customers with FORCE Technology, the highest quality of consultancy, measurement and calculation of wind turbine noise is assured.

We have participated in the development of the internationally accepted measurement technique IEC 61400-11, which is the basis for the methods used in the Danish regulations on wind turbine noise, where we also participate as a consultative party. Therefore, we have first-hand knowledge of measurements of wind turbine noise.

For the measurements, we use a dedicated system for measuring wind turbine noise. Thus, as customers, you can be confident that your measurements are handled in a simple and efficient process, from the planning of the measurements to the reporting of the results.

Regularly, we prepare reports for the Danish Environmental Protection Agency and participate in research projects, e.g. concerning smart noise regulation of wind turbines. By doing so, we are helping to ensure that knowledge of wind turbine noise in Denmark is kept up to date.

Accredited noise measurement when installing new wind turbines

In order to install new wind turbines, the noise contributions and the internal low-frequency noise contributions for the future neighbours must be calculated.

When commissioning the wind turbines, we measure the sound power level at the wind turbine or at least three wind turbines if it is a wind farm.

Based on the applicable executive order on noise notice at the time of approval, we calculate the noise contributions impacting the neighbours at wind speeds of 6 and 8 m/s at 10 metres altitude.

For wind turbines approved after 2011, the noise contributions from other wind turbines in the area must also be calculated. Therefore, the total noise of all relevant wind turbines in the vicinity of the neighbours must comply with the applicable noise limits.

Noise measurement in the type approval of wind turbines

For type approval, we perform measurement of wind turbine noise according to the internationally recognised measurement technique IEC 61400-11, both on large and small wind turbines, both in Denmark and abroad. 

We work under the DANAK accreditation Nr. 100, which is your guarantee that our reports meet both national and international requirements.

This allows you to submit our report as proof of compliance with applicable requirements in the approval process.

Measurement and calculation of wind turbine noise offshore

Offshore wind turbines are installed at sea typically at some distance from the coasts. As for wind turbines on land, we can calculate the noise from the wind turbines using the method from the executive orders on wind turbine. The latest executive order on wind turbine noise (BEK 135) also describes noise measurement on wind turbines located at sea, which we also perform.

The calculation method for the sound propagation over water is updated in the latest executive order (BEK 135). This update is based on a study conducted by FORCE Technology for the Danish

Environmental Protection Agency. Therefore, you benefit from the latest knowledge in the area when you collaborate with us.

Sound propagation – Nord2000 model

Knowledge of sound propagation is one of our unique competencies – also when dealing with sources located up high such as wind turbines.

About the year 2000, we were one of the architects of the sound propagation model Nord2000, which since 2009 has been further developed and validated for tall sources of noise, such as wind turbines, and is now a recognized and frequently used model for calculating the sound propagation of noise from wind turbines.

We are currently part of a research project, focusing on further improvement and validation of the Nord2000 calculation model

Noise and Vibration from subcomponents

We offer advice, measurement and documentation of acoustic noise and vibrations from subcomponents in accordance with applicable directives, executive orders and international standards.

Measurements of noise and vibrations are performed at our laboratories or on-site at your location.

Read more here.

Noise from power plants

Power plants must comply with the public authorities' requirements for measuring and documenting noise.

We offer consultancy and measurements that ensure you the most in-depth knowledge of your noise emissions and impact in the adjacent area. We prepare action plans with instructions on how you can reduce noise from the plant.

The noise from power plants covers long distances, especially the noise from the chimneys. By measuring the noise very close to the mouth of the chimney and at all other installations of the plant, we can calculate the noise load at any distance from the plant, for instance at the closest neighbours.

The noise of the power plant also includes operating machinery, such as bulldozers, tractor excavators, trucks, and lorries. The noise of conveyor belts, ventilation systems and poorly insulated plants and buildings can also contribute to the noise impact of the homes surrounding the power plant.

Read more here.

Contact us for more information on wind turbine noise or read more about acoustics, noise and vibrations.