Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 12

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  operatorzy pilarek spalinowych
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Energy expenditure during labour constitutes one of the criteria used for assessing the laboriousness of timber harvesting. The major objective of this study was to point out the possibilities of defining work net energy expenditure (NEE) as related to the frequency of heart rate in the field exercise tests by changing posture and varied external work load. The scope of the study was restricted to the work of chainsaw operators performing hard physical labour during late thinning of fir and spruce on the middle mountain (Beskid Makowski, Beskid Śląski). The research involved dynamic work with elements of static load for which the NEE was investigated by means of heart rate as well as respiratory – indirect estimation of oxygen consumption as results of airflow measurement. The advantage of both methods is simplicity of application, the lack of necessity to perform additional analyses as time study and expected medium error. The conducted calculations pointed out to a strong linear correlation, where correlative coefficient was equal to 0.67. The conducted model analysis (including, among others: the normality, autocorrelation of residuals and identification of influential values) has confirmed its validity at the 10% statistical error. The obtained regression coefficient indicates a larger increase in value as compared to the available formulas with acceptable in practice standard error of prediction on 6.05 kJ/min level.
One of the most important factors influencing work performance of chainsaw operators, considered as one of the most dangerous, is acquirement of knowledge in a training course enabling to obtain vocational qualifications as a logger and to gain experience in timber harvesting operations. Securing the safety of the chainsaw operator is realized on two levels. Firstly, by organizing appropriate training courses, and secondly, by providing employees with appropriate personal protective equipment. The research was carried out in 15 forest districts in different parts of Poland. The survey conducted on a group of over 200 loggers was aimed at identifying the most important factors affecting health and safety of work in forestry. According to the obtained results, a large group of chainsaw operators completed only a 2−3−day−long training courses, during which they could not get sufficient knowledge how to operate with the chainsaw. The lack of knowledge has a direct impact on the fact that 57% of the respondents use the chainsaw for its extreme wear, 41% of the loggers do not prepare the work place before tree felling and do not debark the stump. 40% of these workers do not set the chain brake, while starting the chainsaw engine. 41% of loggers do not work with an assistant in young stands. The consequences of such negligence are injuries. 76% of them are not reported as accidents at work.
The purpose of this study was to determine models of labor consumption characteristics at the work station of a power chain saw operator in the following timber harvesting technologies: with horse skidding, using the Multi FKS winch, and using the NIAB 5-15 processor. The mean level of labor consumption was 22.66 min/m3. Six equations of a multiple regression were approximated. The coefficient of determination varied from 0.4 to 0.6, and this indicated a good fitting. The factors affecting the labor consumption level were as follows: characteristics of the harvested timber, thinning intensity indexes, and elements of the workday structure. The variation of thinning intensity indexes, determined on the basis of tabular data, was used to determine intervals of timber harvesting labor consumption according to stand age classes (degrees of difficulty) 30 and 40 years.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.