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Measurement-room and capsule systems
Non-reverberating measurement rooms make it possible to analyze noise sources under conditions similar to those found in the free field. Such rooms are used, in particular, by automobile manufacturers and their component suppliers, manufacturers of household appliances, pumps and machines as well as research and educational institutions. The directional characteristics of complex sound sources can be investigated here in order to improve and advance related systems. Special accuracy specifications must be met in order to obtain reproducible measurement results. They are described in DIN 45635-01 titled Noise Measurements on Machines (airborne sound emissions, envelope area techniques, framework procedures for 3 accuracy classes). The German standard is to be replaced by ISO 3745.
Measurement rooms compliant with DIN accuracy class 1 (precision method) meet the following prerequisites:
For frequencies above the lower cut-off frequency f0:
Sound absorption level at vertical incidence > 99% (measurement according to DIN 52215 in Kundt’s tube) and consequently reflection coefficient r < 0.1 for f > f0.
This requirement is met only if all 4 room walls and the ceiling (applicable to acoustic half spaces) or the ceiling and floor (applicable to acoustic full spaces) are paneled with absorption wedges with a depth of approximately λ/4 (λ = wavelength).
pinta wedge and wedge-panel systems comply with these standards for cut-off frequencies f0 ranging from 80 to 250 Hz; solutions for lower cut-off frequencies are developed for individual objects.
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Non-reverberating measurement rooms make it possible to analyze noise sources under conditions similar to those found in the free field. Such rooms are used, in particular, by automobile manufacturers and their component suppliers, manufacturers of household appliances, pumps and machines as well as research and educational institutions. The directional characteristics of complex sound sources can be investigated here in order to improve and advance related systems. Special accuracy specifications must be met in order to obtain reproducible measurement results. They are described in DIN 45635-01 titled Noise Measurements on Machines (airborne sound emissions, envelope area techniques, framework procedures for 3 accuracy classes). The German standard is to be replaced by ISO 3745.
Measurement rooms compliant with DIN accuracy class 1 (precision method) meet the following prerequisites:
For frequencies above the lower cut-off frequency f0:
Sound absorption level at vertical incidence > 99% (measurement according to DIN 52215 in Kundt’s tube) and consequently reflection coefficient r < 0.1 for f > f0.
This requirement is met only if all 4 room walls and the ceiling (applicable to acoustic half spaces) or the ceiling and floor (applicable to acoustic full spaces) are paneled with absorption wedges with a depth of approximately λ/4 (λ = wavelength).
pinta wedge and wedge-panel systems comply with these standards for cut-off frequencies f0 ranging from 80 to 250 Hz; solutions for lower cut-off frequencies are developed for individual objects.
Product Advantages
Made of melamine foam, pinta wedge and wedge-panel systems have the following advantages:
- High light reflection due to white color
- Fully dimensionally stable wedges
- Building material class A2 (non-combustible) or B1 (flame-retardant) according to DIN 4102
- Free of synthetic and natural fiber
- Accuracy class 1 from medium frequencies
- Compact dimensions (minimal costs, low installation weight)
- Highly accurate measurements at low frequencies
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