Repository of Research and Investigative Information

Repository of Research and Investigative Information

Ilam University of Medical Sciences

Handle transmitted vibration of electrical demolition hammers: Frequency and magnitude investigation in field measurements from different bits

Wed Jun 19 10:36:09 2024

(2023) Handle transmitted vibration of electrical demolition hammers: Frequency and magnitude investigation in field measurements from different bits. Journal of Low Frequency Noise Vibration and Active Control. p. 20. ISSN 1461-3484

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Abstract

Using a demolition hammer among the power tools is one of the most challenging job tasks for the operators of these tools, which exposes users to high levels of hand-transmitted vibrations. The focus of this study was for finding the vibration levels transmitted to the handles, the frequency content transmitted by the tool, and the effect of using insert bits with different tip shapes and lengths using conventional demolition hammers under controlled operating conditions on typical concrete slabs in the field. Three demolition hammers (weighing between 14 and 27 kg) with two handles installed were subjected to simultaneous measurements based on ISO 5349 as the field measurement technique. The findings demonstrated that even while the vertical axis dominated, several samples also produced equivalent x-axis results. The impact energy of the tools employed and the transmitted vibration to the tool handles are not significantly correlated with each other. All mean values were higher in the slabs with a thickness of 15 than those with 10 cm. The mean values of the total results for the two forms of flat and point tip inserted bits were 16.85 and 15.86 m/s(2), respectively, and in the samples with the same operating factors, this difference was more than 3 m/s(2) (p < .03). The a( wrms ) (frequency-weighted root mean square acceleration) produced at tools using 60 cm bits were more than those with a length of 40 cm, both for the average of the total results and the average of the results of each hammer. The difference between the average bit length groups over samples with the same factors reached 4.65 m/s(2) (p = .02). Frequency analysis for the flat and point insert bits with 60 cm length in the concrete slabs with a thickness of 15 cm showed that the dominant frequencies detected at lower frequencies for point bits. This difference is almost two frequency parts of 1/3 octave band.

Item Type: Article
Creators:
CreatorsEmail
Monazzam, M. R.UNSPECIFIED
Khavanin, A.UNSPECIFIED
Sarrafzadeh, O.UNSPECIFIED
Parsaeian, M.UNSPECIFIED
Azrah, K.UNSPECIFIED
Keywords: demolition hammer vibration handle bits concrete slabs arm vibration test bench construction workers tools exposure grip disorders system gloves Acoustics
Divisions:
Page Range: p. 20
Journal or Publication Title: Journal of Low Frequency Noise Vibration and Active Control
Journal Index: ISI
Identification Number: https://doi.org/10.1177/14613484231186769
ISSN: 1461-3484
Depositing User: مهندس مهدی شریفی
URI: http://eprints.medilam.ac.ir/id/eprint/4469

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