Application
The measuring system possesses a wide operational area. Among other things, this includes:
Quality control during manufacturing process
- Cylindrical specimens in the laboratory
- Plates of materials in situ without destruction
Input parameters for acoustic modeling
- Absorber model according to Delany / Bazeley
- Phenomenological Model for open porous asphalts, for example for rating of texture of road surfaces
- Biot-Theory · numerical software solutions such as Comsol Multiphysics*
- Calculation of transmission loss and insertion loss of silencers and mufflers with muffler software AED 8001 – AcoustiCalc® Silencer
Optimization in reasearch and development
- of materials with open porosity
- of structures and components
Technical Data
Measurement range (Standard)
- Airflow resistance: 5,5 kPa·s/m3 – 1.900 kPa·s/m3
- Specific airflow resistance: 0,05 kPa·s/m – 15 kPa·s/m
- Airflow resistivity: 0,3 kPa·s/m2 – 3.000 kPa·s/m2
- Possible adjustment of measurement range on demand
Extended measurement range I
- Suitable for investigation of fabrics and other thin open porous material samples
- Airflow resistance: 1,1 kPa·s/m³ – 1.900 kPa·s/m3
- Specific airflow resistance: 0,01 kPa·s/m – 15 kPa·s/m
- Airflow resistivity: 0,05 kPa·s/m2 – 3.000 kPa·s/m2
Extended measurement range II
- Suitable for investigation of open porous material samples with high airflow resistance as well as of road surfaces in situ
- Airflow resistance: 5,5 kPa·s/m3 – 75.000 kPa·s/m3
- Specific airflow resistance: 0,05 kPa·s/m – 600 kPa·s/m
- Airflow resistivity: 0,3 kPa·s/m² – 120.000 kPa·s/m2
Requirements
- Personal computer: Windows 2000 / XP / Vista / 7 / 8, 2x USB-interface
- Primary pressure at measuring system: 2 bar – 5 bar (for example optional compressor)
- Power supply: 230 V (AC), 50 Hz
- Ambient air temperature: 5 °C – 60 °C Dimensions
- Insert for 19“ rack (6 HU, 374,5T)
Specimen Holders
Depending on the application, there are different specimen holders available – specially adjusted types can be delivered on demand.
Type 1
- Application: determination of airflow resistance of materials with open porosity in the laboratory
- Specimens: cylindrical specimens with a diameter of 100 mm as well as fills, fabrics and coverings
- Method: prepared cylindrical specimens of variable thickness are mounted and sealed into the specimen holder
Type II
- Application: nondestructive determination of the airflow resistance of materials with open porosity in situ
- Specimens: material samples with plane surface of at least 240 mm diameter
- Method: pressing of specimen holder onto the specimen with defined force; different seals between specimen holder and specimen can be delivered depending on the application
Compression specimen holder for measurement of airflow resistance of compressed materials with open porosity, fills, fabrics and multilayer systems
Software
The measuring system is supported by the analysis software AED 311.
- Determination of airflow resistance as a function of airflow velocity / volume airflow
- Computation of linear regression and extrapolation of airflow resistance to airflow velocity of 0,5 mm/s
- Averaging of results of various material samples · simple management and comparability of results by application of database
Analysis software AcoustiFlow®
