broj: 3-4/1996        pdf (28,4 MB)



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Znanstveno-stručno i staleško glasilo
Hrvatskoga šumarskoga društva
Journal of Forestry Society of Croatia
      Prvi puta izašao 1877. godine i neprekidno izlazi do današnjeg dana
   ISSN No.: 0373-1332              UDC 630* https://doi.org/10.31298/sl
upute autorima
WEB EDITION
ARHIVA ČASOPISA


HRČAK


 
ORIGINAL SCIENTIFIC PAPERS
     
Matić, S., Oršanić, M., Anić, I. UDK 630*221.4.001
Some Features and Problems Concerning Silver Fir (Abies alba Mill.) Selection Forests in Croatia     pdf     HR     EN 91
Hrašovec, B., Margaletić, J. UDK 630*449 : 323.3.001
Seed Pests and their Impact on Reforestation Efforts in Croatia     pdf     HR     EN 101
Španjol, Ž. UDK 502.7.001
Environmental Protection in the Republic of Croatia     pdf     HR     EN 107
Borzan, Ž., Idžojtić, M., Guttenberger, H. UDK 630*165.42.001 (Picea omorika Panč.)
Research on the Standardization of Gymnosperm Karyotypes using Picea Omorica as an Example     pdf     HR     EN 121
Sever, S. UDK 630*31+903+681 (497.13).001
Some Experience in the Attempt to Define Logging Strategies in Croatia, a Country in Transition     pdf     HR     EN 133
Horvat, D., Sever, S. UDK 631*352.5+319.4 : 630*232.326.2+236.9 : 631*072.16.001
Mulching Flail Mower - one Method for Mechanization of Stand Establishment and Treatment Operations     pdf     HR     EN 143
Krpan, A. P. B. UDK 630*379.001
Problem of Skidding Timber in Croatian Lowland Forests     pdf     HR     EN 151
Horvat, D., Sever, S. UDK 630*375.M--015.2 (234.5) : 630*377.2.001
Some Properties of the Skidders Used Mountain Forest Stand Thinning     pdf     HR     EN 157
Goglia, V., Horvat, D., Risović, S., Sever, S. UDK 332.14.839.31+861.0.001
Past and the Future of the Forest Biomass Utilization in Croatia     pdf     HR     EN 163
Kušan, V. UDK 630*587.001
The Approach to Remote Sensing and GIS in Croatian Forestry     pdf     HR     EN 171
Tomanić, S. UDK 630*689.001
Choise of Subject of Research in Forest Operations     pdf     HR     EN 179
Goglia, V. UDK 630*362.7-015.21(083.7)001
Parameters Influenting the Vibration Level of Portable Chain Saw     pdf     HR     EN 187
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
Goglia, V., Beljo, R. UDK 630*822.34:621*935+9.02.001
Lateral Movement of the Band Saw Blade and Machine´s own Resistance Power in Relation to the Strain Force     pdf     HR     EN 195
Korpel, Š. UDK 630*228.81+221.4.001
Development and Strukture of Beech-Fir Virgin Forests and their Application to the Selection Forest Management     pdf     HR     EN 203

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