Abstract
Chainsaws generate high level vibrations and noise during work. No matter what type of the drive (electric, combustion) they exceed the per-missible levels defined for a standard eight-hour working day. The intensity of a vibro-acoustic impact on chainsaw operators depends on many factors. One of them is the type of the drive. This is due to significant differences in saw design (inter alia characteristics of the drive, rotational speeds - quasi-constant for an electric drive and variable for a combustion one). For chain-saws of the same or similar power and different types of the drive the levels of vibrations and noise may vary. The paper compares the noise levels and frequency weighted vibration accelerations for different types of the drive. The tests were performed with the same interchangeable cutting set (guide bar, cutting chain). The repeatability of the cutting process was ensured. The test results may be helpful when choosing the tool.
Highlights
There exist various mechanized hand-held tools used for timber production and processing
The methodology of chainsaw handle vibration acceleration measurement was based on the guidelines of the ISO 7505:1986 and ISO 33867:2011 standards [5, 6]
If parametrization of all operating modes of the driving unit (ID, RA, full load (FL)) are taken into account, the determined values of ahv will be slightly lower than those presented in the figure
Summary
There exist various mechanized hand-held tools used for timber production and processing. In case of chainsaws with combustion engines the catalogue data analyzed for 157 tools of 12 different brands show that the ahv values determined according to ISO 7505:1986 [5] or ISO 22867:2011 [6] range between 4.4 and 7.1 m/s2 These values do not exceed the maximum value for a short-time exposure (11.2 m/s2), simultaneously exceeding the permissible values for an eight-hour working day. A comparison of vibration impacts of electric and petrol chainsaws having similar parameters based on these equations would not be completely unbiased This is due to the assumption of different time shares for the respective operating modes of the devices. The authors of this paper focused on the comparison of vibro-acoustic impacts of chainsaws for non-professional use depending on the type of a driving unit – a combustion engine or an electric one
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