Determination of limit admissible a-welghted noise emission values of machinery and equipment

摘要

The problem of technical standardization of noise emission values of machinery and equipment is considered as a problem of how to determine limit admissible values of sound power levels of machines by satisfactoring of which it is ensured the fulfillment of noise sanitary norms at operators stations when the scheme of machinery disposition in the room is specified. The system of linear algebraic equations for the limit admissible A-weighted sound power values of machines is derived. Some equations for the mean sound absorption coefficient #alpha# of a room where machines operate are proposed, which can be used when dealing with A-weighted quantities. The comparison of the #alpha# values calculated is done using the recommendations of ISO 3744 too, and the most suitable equation is found. As an example the limit admissible A-weighted sound power levels of curds production workshop equipment are calculated.