Vol.7, No 1, 2009 pp. 11 - 22
UDC 621.664 : 534.6
FORMALIZING THE PROCEDURE FOR DEFINING ACOUSTIC ACTIVITY OF THE GEAR PUMP IN A PROTOTYPE PHASE
Dragan Cvetković, Momir Praščević
Department of Noise and Vibration, Faculty of Occupational Safety of Niš,
University of Niš, Čarnojevića 10a, 18000 Niš, Serbia
E-mail: draganc@znrfak.ni.ac.rs
Abstract.
This research deals with the investigation of the acoustic activity in determination of the sound power level and the sound pressure level of the prototype of oil hydraulic gear pump designed for the fluid transport under high pressure.
The International Standards based on the sound pressure measurements without exception specify sound pressure level as the primary acoustic quantity to be measured. The procedures specified in ISO 3740 series are not always appropriate, for the following reasons:
• Costly facilities are necessary if high precision is required. It is frequently not possible to install and operate large pieces of equipment in such facilities
• They cannot be used in the presence of high levels of extraneous noise generated by sources other than under investigation.
In the study presented shown in this paper ISO 9614-1 is enforced as the standard that gives the methods for determination of the sound power level of noise sources in specified measurement uncertainty and test conditions less restrictive than conditions in ISO 3744 series.
Key Words:
Sound Intensity, Sound Power, Gear Pump.
FORMALIZOVANJE PROCEDURA ZA DEFINISANJE AKUSTIČKE AKTIVNOSTI ZUPČASTE PUMPE U FAZI RAZVOJA PROTOTIPA
Predmet istraživanja je ispitivanje akustičke aktivnosti kroz određivanje nivoa zvučne snage i definisanje nivoa zvučnog pritiska, prototipa uljno-hidraulične zupčaste pumpe namenjene za transport fluida pod visikim pritiskom.
Međunarodni standardi zasnovani na procedurama merenja zvučnog pritiska bez izuzetka navode nivo zvučnog pritiska kao primarnu mernu akustičku veličinu. Standardizovane procedure definisane u standardima serije ISO 3740 nisu uvek odgovarajuće iz sledećih razloga:
• Ukoliko se zahteva visoka preciznost pri merenju - neophodni su skupi objekti i sredstva, a često nije moguće instalirati i pustiti u rad velike mašine i delove opreme u takvim objektima.
• Ne mogu se koristiti u ambijentu sa visokim nivoom pozadinske buke.
U istraživanjima koja su prikazana u radu primenjen je standard ISO 9614-1 čija je namena definisanje metoda pomoću kojih se može odrediti nivo zvučne snage izvora, u definisanim opsezima nesigurnosti, sa test uslovima koji su manje restriktivni od uslova zahtevanih u seriji standarda ISO 3740.
Ključne reči: Intenzitet zvuka, zvučna snaga, zupčasta pumpa
