Measuring Coupling Forces Woodcutters Exert on Saws in Real Working Conditions

Malinowska-Borowska, Jolanta; Harazin, Barbara; Zieliński, Grzegorz

doi:10.1080/10803548.2012.11076918

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…Rottensteiner et al (2012) conducted their research on power saws of the same performance class as that of Stihl MS 362 and found out that the weighted means of vibrations with no regard to tree species were 5.54 m s -2 for Husqvarna 357 XP and 4.26 m s -2 for Husqvarna 372 XP. In another research study conducted by Malinowska-Borowska et al (2012), vibrations on the front chain saw handle and the sum of accelerations in three axes ranged between 5.4 and 5.9 m s -2 . The results of both studies brought higher values than those recorded in our research.…”

Section: Discussionmentioning

confidence: 98%

“…Grip strength of power saw handle affecting the transmission of HAV depends on the operator's experience, work procedures and wood hardness. This means that forces developed by power saw operators are higher in less experienced workers, greater in felling and crosscutting than in delimbing, and greater in tree species of higher wood hardness (Malinowska-Borowska et al 2012;Malinowska-Borowska & Zieliński 2013;Yovi & Yamada 2019). According some other research works Goglia et al 2012;Yovi & Yamada 2019), the level of power saw vibrations is also affected by the chain ten-sion, bar length, fuel amount in the tank and the way of holding the saw.…”

Section: Discussionmentioning

confidence: 98%

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Difference in the magnitude of power saw vibrations affecting the operator during forest felling

Staněk¹,

Neruda²,

Mergl³

et al. 2023

Central European Forestry Journal

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This study deals with a question whether the magnitude of vibrations affecting the power saw operator during the tree felling is still the same or not. For this purpose, the tree felling was broken down into several partial operations (pruning of lower tree part; cutting of buttresses; felling; delimbing) at which the values of vibrations were recorded and mutually compared. The vibrations were measured during the felling of 121 trees with the activity being made by one feller with one type of power saw and one type of power saw chain, and the felled trees included both live and dead standing trees. The vibrations were measured on the front and rear handles of the power saw in compliance with standards EN ISO 22867, EN ISO 5349-1 and EN ISO 5349–2. As to the mutual comparison, research results demonstrated a difference in 69.23% of cases. A maximum increase of vibrations during the experiment (17.0 m s–2) was recorded on the rear handle during the partial activity of Delimbing live trees, the lowest increase of vibrations (0.320 m s–2) being localized in the same partial activity, only on the front handle.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 98%

Difference in the magnitude of power saw vibrations affecting the operator during forest felling

Staněk¹,

Neruda²,

Mergl³

et al. 2023

Central European Forestry Journal

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“…A notable influence of differing coupling forces for both the chainsaws seems to be limited to the rear handle during the work element "Sawing" and some actions of work element two "Actions related to sawing". Nevertheless, measuring these forces, e.g., through a hydro-electronic force meter [59], provides perhaps the largest potential to enhance future studies.…”

Section: Vibration Exposurementioning

confidence: 99%

Vibration and Noise Exposure during Pre-Commercial Thinning Operations: What Are the Ergonomic Benefits of the Latest Generation Professional-Grade Battery-Powered Chainsaws?

Huber

Hoffmann

Brieger

et al. 2021

Forests

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In order to compare the vibration and noise exposure of STIHL’s battery-powered MSA 220 C and the combustion driven MS 201 C, a professional operator was monitored during a pre-commercial thinning operation in a twenty-year-old hardwood stand. The vibration levels were measured with a tri-axial accelerometer on the front and rear handle of both the chainsaws, and assigned to five different work elements using a video documentation. Additionally, noise levels were recorded in one-minute intervals, with a dosemeter worn by the operator. The results show that battery-powered chainsaws, when compared to combustion-driven chainsaws, can reduce the daily vibration exposure by more than 45% and the noise dose by about 78.4%, during pre-commercial thinning tasks. Replacing combustion-driven chainsaws with battery-powered ones is therefore generally recommended, to reduce occupational health risks for operators, in this respect. However, the daily vibration exposure of about 2.42 m/s2, caused by the battery-powered chainsaw on the front handle, is still very close to the daily exposure action value set by the EU directives for health and safety requirements. The daily noise exposure of 89.18 dB(A) even exceeds the upper exposure action value. Consequently, a further reduction in the vibration exposure during work is desirable. With respect to noise exposure, additional measures must be implemented for conformity with the current safety standards, making the use of hearing protectors mandatory for electric chainsaws, too.

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“…The transmission is influenced by the grip strength of a chainsaw handle which depends on the worker's work experience, work operation, and wood hardness. According to Malinowska-Borowska et al [12][13][14], grip is stronger in wood of higher hardness, in felling and sawing, Forests 2023, 14, 929 2 of 15 and in less-experienced workers. Hand-arm vibrations differ with respect to the type of wood and are higher in species with higher wood density [15].…”

Section: Introductionmentioning

confidence: 99%

Daily Vibration Exposure in the Context of State and European Legislature: A Case Study among Chainsaw Operators in Croatia

Bačić

Pandur

Šušnjar

et al. 2023

Forests

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The Ordinance on Occupational Safety and Health in Forestry proposes no more than 4 h of effective chainsaw work daily, while EU Directive 2002/44/EC proposes an EAV of 2.5 m/s2, and an ELV of 5 m/s2. The aim of this paper was to compare and assess the viability of the proposed restrictions. A case study in Croatia including 91 felled and processed trees, a detailed time study, and vibration magnitude measuring on European beech wet wood in compliance with ISO 5349-1:2001 and ISO 5349-2:2001 standards were performed. The results implied that tree species, processing method, and DBH have no influence on the time structure of working hours. Using bigger and more powerful chainsaws resulted in higher A(8) values; it was also noted that the right hand is more exposed. On average, none of the observed chainsaws exceeded 5 m/s2 of A(8). It can be concluded that state legislature, which allows a maximum of 4 h of chainsaw work a day, is appropriately protecting chainsaw workers from vibration exposure, but is also obsolete (1986) as it only uses the time limit. In contrast, European legislature requires a methodical approach to A(8) calculation and leaves room for individual evaluation of specific chainsaw work, which opens up possibilities of extending or shortening some chainsaw operations.

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Measuring Coupling Forces Woodcutters Exert on Saws in Real Working Conditions

Abstract: Prolonged exposure to hand-arm vibration (HAV) coupling forces hydro-electronic force meter chainsaw vibration exposure

Cited by 7 publications

References 8 publications

Difference in the magnitude of power saw vibrations affecting the operator during forest felling

Difference in the magnitude of power saw vibrations affecting the operator during forest felling

Vibration and Noise Exposure during Pre-Commercial Thinning Operations: What Are the Ergonomic Benefits of the Latest Generation Professional-Grade Battery-Powered Chainsaws?

Daily Vibration Exposure in the Context of State and European Legislature: A Case Study among Chainsaw Operators in Croatia

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