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Reduction of noise emissions of fluid system

To develop hydraulic and pneumatic systems that from the point of view of noise emission meet and exceed the csn iso 73 0527 requirements and pi applications in theatre techniques en 1570 requirements.

Hydraulic and pneumatic drives including distribution have a high output proportion in relation to equipment mass. This output concentration causes raised noise levels in equipment. Noise level is a meaningful criterion of the equipment not only from the point of view of meeting the mentioned standards, but at the same time it is a risk factor for the environment. This problem is significant in the area of theatre techniques, where according to EN 1570 the noise level in the first two rows of the auditorium should be a maximum 40db(a). Noise values in EU countries are strictly controlled and, if they are not complied with, result in major economic and other losses for the equipment supplier. It is both the source of noise and its transfer, in particular via pipes and other medium that affect the reduction of any noise impact. Our research shows that the problems of noise reduction are solved in the area of fluid systems in about 20% of cases. In fluid systems the noise occurrence and its transfer is very complicated. The source of noise is in most cases a hydro-generator and noise is transferred not only in the fluid column, but also in pipeline and control valves. Sound in the liquid is caused first of all with volume and pressure pulses, which are caused by the hydro-generator. The other sources of noise are the switchboards, pressure and flow valves that can cause cavitation and turbulence, resulting in highly frequent noise emissions. Knowledge of the source, sound direction and emission are necessary conditions for reducing noise and defining the principle for minimising its occurrence and effect. The definition of noise as well as its attenuation is of course natural for cases where it is impossible to prevent it occurring. The attenuation process will be defined in the area of various amplitudes and frequencies given by the surrounding area and external conditions. The project will be completed in the following stages: - Measuring the acoustic effect of hydraulic and pneumatic unit; estimation. - Research and development of anti-noise hoods of hydraulic and pneumatic aggregates. - Project design of thermally stabilised hood prototypes including parameter optimisation. - Fabrication and semi-production application of prototype including experimental verification, and optimisation of the functional composition of equipment. - Industrial development for the noise reduction distribution. Keywords: ecology, fluid systems.
Acronym: 
ANTINOISEFLUIDSYSTEM
Project ID: 
3 850
Start date: 
01-01-2007
Project Duration: 
36months
Project costs: 
520 000.00€
Technological Area: 
Acoustic safety
Market Area: 
Industrial Services

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