Naslov
A research into the changes of ergonomic characteristics of some chain saws during their usually expected service life

Autori
Goglia, Vlado ; Lipoglavsek, Marjan ; Puljak, Stjepan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Forest and Society: The Role of Research, Vol. 2 Abstracts of group discussions XXI IUFRO World Congress 2000 / Krishnapillay, Baskaran et all. - Kuala Lumpur : IUFRO Committee, 2000

Skup
Forest and Society: The Role of Research, XXI IUFRO World Congress 2000

Mjesto i datum
Kuala Lumpur, Malezija, 07.08.2000. - 12.08.2000

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ergonomic characteristics; chain saws; service life

Sažetak
The paper presents results of the research carried out into the operating time influence on noise and vibration levels of motor chain saws.. The research was carried out on the sample of 32 (16 Stihl 038 and 16 Husqvarna 266SG) chain saws in order to find out the possible changes that may occur during the four years operation period of the saws. For that reason the tested sample included chain saws that had been in normal operation for one, two, three and four years. All tested saws were used in the same operating conditions during which they had been maintained in the same way. Measurements were carried out on normal production saws randomly chosen. Previous to testing all saws were examined and adjusted in accordance with the producer's recommendations. The vibrations transmitted to the hands of the chain saw operator were measured in accordance with ISO 7505 measuring procedures. Prior to measurements, the saws have been run and warmed. in accordance with the experiment plan the vibration measurements on front and rear handle were carried out. All three axes were measured simultaneously. During measurement unweighted accelerometer signals from each of the three orthogonal directions were recorded on the tape recorder. The analysis of the recorded signals was made in laboratory conditions using a computer aided frequency analyzer. Vibrations at the front and rear handle were measured at the following working conditions: a) idling rotational frequency b) at full load - at the speed at maximum power c) at racing - at an engine speed which is 133 % of the speed at maximum engine power. For each handle and for each rotational frequency five independent measurement values were taken. After the 1/3 octave band frequency analysis the weighted accelerations as well as the WAS values for each rotational frequency were calculated. Themeasurements results are presented in tables and diagrams. The noise level emitted by the chain saws at the same working conditions was measured too. The ISO 7182. As at vibrations measurement, for each rotational frequency five independent measurement values were taken. Again, the measurement results are presented in tables and diagrams.The research has shown that there are almost no indications of significant changes of the investigated ergonomic chain saws characteristics during the four-year normal operating period. This conclusion suggests the necessity of monitoring the main ergonomic characteristics of the motor chain saws during operation.

Izvorni jezik
Engleski

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