Standard hammer mill
A standard hammer mill is a device which, by generating noises, is used to measure the sound insulation of ceilings when examining impact sound and walking sound on floors in accordance with the ISO 140, DIN 52210 and EN 16205 standards. The compact design essentially consists of an electromagnetic hammer drive, the drive itself generating almost no significant noise. A standard hammer mill is described in the EN ISO 140-6 standard .
In Germany it is checked by the Physikalisch-Technische Bundesanstalt .
function
Five hammers attached in parallel, each weighing 500 grams, generate 10 blows per second. The time between 2 beats is 100 milliseconds. The drop height of the hammers is set at 40 millimeters and can be readjusted by up to ± 5 mm if necessary or if there are changes to the standard. The standard hammer mill is operated with 230 V mains voltage .
Data acquisition
The measurement of the noises emitted by a ceiling support on a reference concrete ceiling when excited by a standard hammer mill is usually carried out in a test stand. The noise is measured in the room in which the ceiling pad is located and the excitation takes place.
To evaluate the mechanical vibration magnitude that a standard hammer mill generates, it is recorded by a sound transducer and converted into an analog electrical signal. This signal is electrically amplified and, depending on the measuring task, frequency-weighted. The rms value is calculated from this and displayed with a measuring instrument or fed to a data logger .
Web links
- Standard hammer mill according to DIN 52210
- Lutz Weber, Group Leader Building Acoustics at Fraunhofer-IBP in Stuttgart, "This is how impact noise is stimulated"
Individual evidence
- ↑ Standard hammer mill DIN EN ISO 140-6