Experimental evaluation of uncertainty in hand–arm vibration measurements

Ainsa, Ignacio; González, David; Lizaranzu, M.; Bernad, Carlos

doi:10.1016/j.ergon.2011.01.002

Cited by 12 publications

(16 citation statements)

References 11 publications

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“…The accelerometer was previously calibrated using the portable multi-frequency and multi-level calibrator for vibration transducers HD2060 (Delta Ohm, Italy) using a frequency of 159.155 Hz, according to ISO 8041:2005 [11]. The accelerometer wire was additionally tied in order to avoid hindrance while carrying out the activity, as well as to avoid eventual noise in the withdrawn signal, as reported byAinsa et al [12]. The accelerations were simultaneously measured along the three perpendicular axes (X, Y, Z), according to the recommendations of the EN ISO/DIS 20643/A1 standard [13] as follows: the x-axis was perpendicular to the palm area, the y-axis parallel to the longitudinal axis of the grip, and the z-axis directed along the third metacarpal bone of the operator's hand.…”

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

“…Four attachment approaches (screwing, gluing, using a hose clamp, or using a handheld adapter) are recommended in the standard [5]. Each of them has unique advantages and disadvantages [22,23]. The handheld adapter approach is most convenient and efficient.…”

Section: Introductionmentioning

confidence: 99%

“…With this approach, the accelerometer can also be positioned at the most desired location: the central area of hand-handle interference. Many adapter configurations have been designed [22,24–26]. Some of them have also been adopted in the standard [5].…”

Section: Introductionmentioning

confidence: 99%

“…The adapter approach has also been incorporated into handheld vibration dosimeters [27,28], which can make the measurement very convenient and efficient. On the other hand, the adapter approach is generally considered as the least reliable among the four recommended approaches [22,23]. While the adapter approach is not generally recommended for the measurement of vibration on engineering structures [29], it is considered as the last choice in the standard for measuring the hand-transmitted vibration exposure [5].…”

Section: Introductionmentioning

confidence: 99%

“…While the adapter approach is not generally recommended for the measurement of vibration on engineering structures [29], it is considered as the last choice in the standard for measuring the hand-transmitted vibration exposure [5]. Although some studies have been performed to optimize adapter designs [22,26], the exact sources and mechanisms of the measurement errors and uncertainties using the adapter approach have not been clearly identified. In particular, there are few reports on the effects of hand biodynamics on the measurement.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An examination of the handheld adapter approach for measuring hand-transmitted vibration exposure

Dong

Welcome

et al. 2014

Measurement

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The use of a handheld adapter equipped with a tri-axial accelerometer is the most convenient and efficient approach for measuring vibration exposure at the hand-tool interface, especially when the adapter is incorporated into a miniature handheld or wrist-strapped dosimeter. To help optimize the adapter approach, the specific aims of this study are to identify and understand the major sources and mechanisms of measurement errors and uncertainties associated with using these adapters, and to explore their improvements. Five representative adapter models were selected and used in the experiment. Five human subjects served as operators in the experiment on a hand-arm vibration test system. The results of this study confirm that many of the handheld adapters can produce substantial overestimations of vibration exposure, and measurement errors can significantly vary with tool, adapter model, mounting position, mounting orientation, and subject. Major problems with this approach include unavoidable influence of the hand dynamic motion on the adapter, unstable attachment, insufficient attachment contact force, and inappropriate adapter structure. However, the results of this study also suggest that measurement errors can be substantially reduced if the design and use of an adapter can be systematically optimized toward minimizing the combined effects of the identified factors. Some potential methods for improving the design and use of the adapters are also proposed and discussed.

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Assessing the influence of hand-arm posture on mechanical responses of the human hand during drilling operation

Sasikumar¹,

Lenin²

2016

Int J Adv Manuf Technol

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Experimental evaluation of uncertainty in hand–arm vibration measurements

Cited by 12 publications

References 11 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

An examination of the handheld adapter approach for measuring hand-transmitted vibration exposure

Assessing the influence of hand-arm posture on mechanical responses of the human hand during drilling operation

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