Estimating emissions
Expected emissions from equipment and installations, determined from technical data, operating conditions and current calculation methods.
Sound propagation simulations according to the current state of the art, as a reliable basis for planning and permits.
A forecast answers the question that comes before the project: which rating levels will occur at the relevant receiver locations once the installation is in operation? We calculate this for new installations in permit procedures, for extensions of existing ones and for planning variants that are to be weighed against each other.
Calculations are made in SoundPLAN according to DIN ISO 9613-2, and for roads and railways according to RLS-19 and Schall 03. The model includes terrain, buildings, sources with their sound power levels, operating times and existing screening. The result is point values at the receiver locations or a grid noise map for the entire area.
Once the project has been implemented, we also offer control, acceptance and verification measurements. With traffic noise, there is also the question of whether a realistic data basis on traffic volumes is available. We recalculate existing calculations with this in mind or prepare new ones, if necessary with our own traffic count and measurement.
Expected emissions from equipment and installations, determined from technical data, operating conditions and current calculation methods.
How does sound spread through the surroundings? We forecast the impact on residential buildings and other sensitive areas.
Terrain, wind effects, temperature conditions and the structure of the built environment are included in the forecast.
Required and retrofitted noise control, presented with a transparent cost-benefit assessment.
Terrain model, buildings and roads are built up as a three-dimensional data set, with contour lines from the state survey and building outlines from the land register.
Each source is given its sound power level: the road from traffic volumes and the share of heavy vehicles according to RLS-19, the installation from manufacturer's data and our own emission measurement.
Calculations follow DIN ISO 9613-2: geometric spreading, air and ground attenuation, screening and reflections from façades, for each grid point individually.
What counts for the assessment is not the grid but the relevant receiver location: 0.5 m in front of the open window of the most affected room, floor by floor.
The same calculation with screening. It works where it interrupts the line of sight: clearly on the ground floor, hardly at all on the third floor. This is exactly what decides the measure.
Calculates propagation in the terrain model and accompanies assessments through the permit procedure.