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V. Goglia: NEKI UT1ECAJNI PARAMETRI NA RAZINU VIBRACIJA MOTORNIH PILA LANČANICA Šumarski list br. 3—4, CXX (19%). 187—194 LITERATURA - References l.Sjerobabski , \. (1975): Utjecaj buke i vibracija na zdravlje 8. ... ISO 5348: 1987, Mechanical vibration and shock - Mechani i proizvodnost radnika, Zbornik referata savjetovanja Za- cal mounting of accelerometers štita okoline od prekomjerne buke i vibracija, Opatija, str. 9. ... ISO/TC 108/SC4/14: 1974, Guide for the evaluation of the 1^-25 human exposure to hand transmitted vibration 2. Bog adi-Šare, A.: Metode i kriteriji u dijagnostici vibracij- 10. ... DIN 45675: 1987, Einwirkung mechanischer Schwingungen ske bolesti, Radovi 25(1990) 1, Šumarski institut Jastrebar- auf das Hand-Arm-System, Messung der Schwingungen von sko, str. 133-149 Handkettensagemaschinen, Teil 1 i Teil 2 3.Radišić , I.: Utjecaj interminentne ekspozicije vibracijama na 11. ...DIN45671: 1987, Messung mechanischer Schwingungen am prevalenciju vibracionog sindroma, Radovi 25(1990)1, Šu- Arbeitsplatz, Teil 1 i Teil 2 marski institut Jastrebarsko, str. 149-157 12. ... ČSN 470172: 1984, Metodika mereni vibraci na pracovišti 4. ... IEC 651: 1979, Sound level meters 13. ... NF E90-402: Guide pour 1´ evaluation de I´ exposition des 5. ... ISO 6531: 1982, Machinery far forestry - Portable chain saws individuus aux vibrations transmises aux membres superie- Vocabulary uns 6. ...ISO 5349: 1986, Guidelines for the measurement and the asse- 14. ... ISO 7505: 1986, Forestry machinery - Chain saws - Measussment of human exposure to hand-transmitted vibration rement of hand transmitted vibration 7. ... ISO 5347: 1987, Method of calibration of vibration and pic- 15. Goglia V.: Osigurava li ISO 7505 mjernu ponovljivost?, Mehakups nizacija šumarstva 19(1994)1 SUMMARY: It is a well known fact that the vibration level of the motor chain saws is influenced by a large number of parameters. To provide for repeatability and reproducibility of the vibration level measurements, the international standards seek to give a clear definition of the measurement procedure for measuring vibrations on the motor chain saw handles. Only a well- defined measurement procedure enables the ergonomic evaluation of motor chain saws and the choice of the type best meeting the imposed ergonomic criteria. Unfortunately, the measurements of the vibration levels made in various laboratories on the same motor chain saw showed substantially different results. In inevitably leads to the conclusion that the measurement procedure does not control all the significant parameters influencing the vibration level of the motor chain saws. It is therefore necessary to do further research work into the quantification of the factors of influence yet not mentioned by the international standards. Bearing this in mind, a research work on motor chain saw vibration levels was done at the Faculty of Forestry, University of Zagreb, Croatia. The following parameters were studied: -operator, - chain strain, - chain guide length, -fuel level in tank, - ways of gripping the motor chain saw handles. The influences of these parameters were quantified by measurements. The paper presents detailled research data and results, which are very interesting in many respects: some of the obtained results were expected, but some of them came as a suprise. The research results on the whole give us reason to believe that this research work might contributed to the gradual improvement of the procedure for measuring vibrations on the motor chain saw handles and initiate the necessary changes of the relevant international standards. Key words: chain saw, vibration, measuring procedure, international standards |