Potencia sonora
Noise emission values are increasingly becoming the subject of regulations for a safer and healthier working place and for the protection of the environment.
Moreover, awareness among consumers regarding noise issues has substantially increased and voluntary awards for companies who meet acoustical criteria are becoming a product differentiator.
In cases where the noise emissions of products have been significantly reduced (e.g., within the information technology industry) customer acceptability of the product is mostly related to absence/minimal presence of tonal components.
Two quantities which complement each other can be used to describe noise emissions. One is the sound power which has become the preferred quantity as it is independent of the particular circumstances of the measuring environment.
The other is the emission sound pressure at specified positions in the vicinity of the machinery (e.g., operator's position).
Measuring Sound Power
Sound Power can be determined according to three main methods:
- Measure the sound pressure due to the source in a free (or essentially free) sound field, and then determine its sound power from the sound pressure measurements.
- As 1, but in a diffuse sound field.
- Direct measurements of sound intensity in any sound field to determine the sound power of the source.
The pressure-based methods are most often used for production audits and high-volume testing (with specific standards for information technology equipment), while the intensity-based methods are generally used for engineering and in-situ measurements.
PULSE Sound Power Type 7799
... is a software application for determining noise emission quantities of machinery, equipment and their sub-assemblies.
It includes the determination of sound power levels as described in international standards, as well as the measurement of emission sound pressure levels at specified positions in the vicinity of a machine.
Moreover, to evaluate the annoyance of tonal components in noise emissions, the calculation of two complementary parameters, Tone-to-Noise Ratio and Prominence Ratio, is seamlessly integrated in the solution.
Uses
- To determine whether a product complies with noise specifications (legislation, voluntary awards)
- To compare the noise emissions of machinery and equipment of the same and different types (for example, when benchmarking, or in engineering work, when developing quieter products)
- To analyze product sound in terms of identification and evaluation of prominent discrete tones and impulsive noise
Features
- Comprehensive solution for determining noise emission quantities such as sound power levels and emission sound pressure levels
- Measurement procedures and calculations based on basic International Standards ISO3741 to ISO3743 (comparison method), ISO3744 to ISO3746, ISO9614-2 and ISO11201, and noise test codes for information technology ISO7779 and ECMA74
- Measurement procedures and calculations based on International Standard IEC 60704-2-4:2001 Household and similar electrical appliances. Test code for the determination of airborne acoustical noise. Particular requirements for washing machines and spin extractors (identical to European Standard EN 60704-2-4:2001)
- With the help of the interactive measurement setup and information windows, the user is guided through the measurement process
- Measurement data and results can be conveniently saved to familiar Microsoft® Excel® workbooks for customised reporting and further post-processing
- PULSE platform ensures exceptional measurement accuracy
- Scalable solution
