Main safety aspects of agricultural machinery: management of control tests on noise emitted according to EN ISO/IEC 17025:2005
Fanigliulo, R.; Fornaciari, L.; Vassalini, G.; Biocca, M.; Brannetti, G.; Cervellini, C.; Pochi, D.
International Conference RAGUSA SHWA 2012, September 3-6, 2012, Ragusa – Italy “Safety Health and Welfare in Agriculture and in Agro-food Systems”
|Kind of publication:|
|Abstract in Italian:|
|Abstract in English:|
The aspects of functionality and safety of agricultural operating machines are being studied at
CRA-ING, since about twenty years by Testing Centre of Agricultural Machinery (CPMA).
According to ISO and EN standards and to comply with some provisions of the Machinery
Directive 2006/42/EC, this activity includes control tests of pressure and sound power levels
emitted by mounted, trailed and self-propelled machines, the values of which must be declared
by the manufacturer in the user and maintenance manual. As example of CPMA test activity,
accredited as Testing Laboratory (ACCREDIA no. 1141) in accordance with the requirements
of the EN ISO/IEC 17025:2005 standard, this paper reports the results of tests on a pneumatic
seed drill, aimed at verifying the noise emitted. The measurements of the sound pressure levels
(according to EN ISO 4254-1:2010 and EN ISO 11201:2010) and of the sound power levels
(according to EN ISO 3744:2010 and EN ISO 4254-1:2010) are among the tests accredited. The
former are measured for frequency bands in 1/3-octaves in the range 100 Hz to 10.000 Hz, as the
latter are measured in 10 micro-phonic positions dislocated on an hemispherical measurement
surface. A Brüel&Kjær instrumental chain is employed, consisting of a real-time frequency
analyzer, a microphone and a sound level calibrator. The test results, provided with the
associated measurement uncertainty, showed a sound pressure level of 90.6 dB (A) ± 1.4 dB,
above the limit of 80 dB (A) indicated by the Machinery Directive, requiring to measure of the
sound power level. This resulted of 106.5 dB (A) ± 3.2 dB.