The design and development of suspended handles for reducing hand-arm vibration in petrol driven grass trimmer

Ko, Ying Hao; Ooi, Lu Ean; Ripin, Zaidi Mohd

doi:10.1016/j.ergon.2011.04.004

Cited by 43 publications

(19 citation statements)

References 34 publications

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“…As suggested by Ko et al [15], to measure vibration magnitude, it is useful to adopt the averages of frequencyweighted root-mean-square (rms) acceleration expressed in ms -2 (Eq. 1), according to ISO 5349-1 (2001):…”

Section: Methodsmentioning

confidence: 99%

Occupational risks related to vibrations using a brush cutter for green area management

Bernardi¹,

Quendler²,

Benalia³

et al. 2018

Ann Agric Environ Med.

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Introduction. Weed control is one of the most important issues in the maintenance sectors of both agriculture and green areas. Small tools are employed for controlling grass and other growths on steep verges and river banks. This leads the operators being exposed to many risks among which vibration is one. The purpose of this study is to measure and evaluate hand-arm vibration and to verify the daily exposure to which workers are often subjected while weeding. Materials and method. Two cutting heads, a brush knife and a mowing head were compared. Both were mounted on the same cow-horn brush cutter. The vibration total value was expressed as the root-mean-square (rms) of three component values according to the axes X, Y and Z. The signal was frequency weighted using the weighting curve Wh, as described in the ISO 5349-1 (2001) standard. In addition, the daily vibration exposure was calculated and compared with the thresholds set by EU Directive 2002/44/EC (2005. Results. The obtained results showed that the exposure action value (EAV) of 2.5 ms -2 was exceeded while using both cutting heads. The exposure limit value (ELV) using the brush knife also exceeded 5 ms -2 . Conclusions. The results highlighted important aspects in terms of exposure values that should be considered with the view of preventing the risk of Hand-Arm Vibration Syndrome (HAVS) to which the operators who frequently use these tools are exposed. Specific measures should therefore be taken to protect the exposed workers.

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Section: Methodsmentioning

confidence: 99%

Occupational risks related to vibrations using a brush cutter for green area management

Bernardi¹,

Quendler²,

Benalia³

et al. 2018

Ann Agric Environ Med.

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show abstract

“…The most common symptoms are: hearing loss, stress, irritation, memory loss and sleep disturbance (Nelson et al 2005, Ouis 1999, Shah et al 2018, Stansfeld et al 2000, Tengku et al 2013. Long-term exposure to vibrations may also have negative health effects in the form of vascular, neurological and musculoskeletal disorders (Dziurdź 2011, Ko et al 2011, Pettersson 2013, Truţa et al 2013. Various aspects of working with a brush cutter have been researched by many authors; however, the issue of noise level emitted by different cutting attachments while tending forest plantations has not been assessed yet.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cutting Attachment on Noise Level Emitted by Brush Cutter during Tending of Young Forests

Naskrent

Grzywiński

Łukowski

et al. 2019

Croat. j. for. eng. (Online)

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A brush cutter is the most frequently used equipment for tending young forests. When cutting unwanted vegetation, the operator is exposed to various harmful factors, such as: a forced body position, noise, vibrations and exhaust emissions. In this study, the impact of cutting attachment type on the noise level during tending of young pine stands was examined. The attachments used during the tests included: a wire head and cutting blades with 2, 3 and 24 cutting teeth. The research was carried out on 2–3 year old Scots pine plantations covered with three types of vegetation: herbaceous, mixed and woody. It was proven that the the wire head was the device that generated the highest level of noise. In the case of cutting blades, the number of cutting teeth was the important factor. The greater the number of teeth in the cutting blades, the lower the noise level the device produced. There was no significant influence of vegetation type on noise emission level. Based on the results, in order to minimize operators’ exposure to noise, the use of wire cutting attachment should be limited.

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“…Mazlan and Ripin [6] established a three-degree-of-freedom dynamic model of the orbital sander. There were also some researches about the vibration reduction of grass trimmer vibration [7,8]. Furthermore, Rakheja et al [9] and Yan et al [10] both provided a hammer dynamic model based on some simple assumptions.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling and vibration simulation of an orbital sander

Shi¹,

Sun²

2019

Vib. proced.

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Numerous epidemiological studies have shown that operators who use hand-held power tools are prone to develop hand-arm vibration syndrome. Therefore, it is necessary to reduce the tool vibrations to protect the worker's health. This research focuses on the dynamic modeling and the vibration simulation of orbital sanders which are commonly used in industrial sectors. The mathematic model with eighteen degrees-of-freedom (DOF) of this machine is established based upon the Lagrange equation. The experiments are also conducted to test vibrations at the top of the housing where the operators hold the machine. The simulated results are found in good coincidence with the experimental results, and the errors between the experimental results and the simulated values are in acceptable range, which demonstrates the mathematic model in this paper is accurate.

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The design and development of suspended handles for reducing hand-arm vibration in petrol driven grass trimmer

Cited by 43 publications

References 34 publications

Occupational risks related to vibrations using a brush cutter for green area management

Occupational risks related to vibrations using a brush cutter for green area management

Influence of Cutting Attachment on Noise Level Emitted by Brush Cutter during Tending of Young Forests

Mathematical modeling and vibration simulation of an orbital sander

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