Design of a suspended handle to attenuate rock drill hand-arm vibration: model development and validation

Oddo, Rémy; Loyau, Thierry; Boileau, P.-É.; Champoux, Yvan

doi:10.1016/j.jsv.2003.06.006

Cited by 16 publications

(8 citation statements)

References 5 publications

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“…Although the model recommended in ISO 10068 was found questionable and impractical for the construction of a test rig 10,11,86) , it has been used for the theoretical analysis of a vibrating tool 87) . If the dominant frequency of the tool is in the neighborhood of 40 Hz or less, a single degree-offreedom (1D) model may provide a reasonable approximation because the system response can be approximately modeled as a 1D system in this frequency region 10) .…”

Section: Applications Of Biodynamic Response To the Design Of Vibratimentioning

confidence: 99%

Recent Advances in Biodynamics of Human Hand-Arm System

Dong

Welcome

2005

INDUSTRIAL HEALTH

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The biodynamics of human hand-arm system is one of the most important foundations for the measurement, evaluation, and risk assessment of hand-transmitted vibration (HTV) exposure. This paper presents a new conceptual model relating factors influencing cause-effect relationships for HTV exposure, a new study strategy, and a comprehensive review of the recent advances in the biodynamics closely associated with HTV exposure. The review covers the following five aspects: theoretical modeling of biodynamic responses, vibration transmissibility, driving-point biodynamic responses, evaluation of anti-vibration gloves, and applied forces. This review finds that some significant advances in each of these aspects have been achieved in the recent years. Several important issues and problems in the biodynamic measurement have been identified and resolved, which has significantly helped improve the reliability and accuracy of the experimental data. The results reported in recent years suggest that, from the point of view of biodynamics, the frequency weighting specified in ISO 5349-1 (2001) overestimates the low frequency effect but underestimates the high frequency effect on the fingers and hand. The major problems, issues, and topics for further studies are also outlined in this paper. It is anticipated that the further studies of the biodynamics of the system will eventually lead to establishment of a robust vibration exposure theory. Although this review focuses on the biodynamics of the hand-arm system, the fundamental concepts and some methodologies reviewed in this paper may also be applicable for the study of whole-body vibration exposure.

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Section: Applications Of Biodynamic Response To the Design Of Vibratimentioning

confidence: 99%

Recent Advances in Biodynamics of Human Hand-Arm System

Dong

Welcome

2005

INDUSTRIAL HEALTH

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“…The machines involved are pneumatic hammers, rock drills, orbital sanders, grass trimmers, etc. The vibration levels of the power tools such as pneumatic hammer (30 m/s 2 ), 1 rock drill (24-25 m/s 2 ), 2 orbital sander (3.9-7.3 m/s 2 ), 3 and grass trimmer (4.5-11.3 m/s 2 ) 4 were evaluated by various researchers. The continuous use of vibrating machines with high magnitude of vibration may expose the hand to hand-arm vibration (HAV) which may lead to the hand-arm vibration syndrome and carpal tunnel syndrome.…”

Section: Introductionmentioning

confidence: 99%

“…Bio-mechanical models were developed by many researchers in order to evaluate the biodynamic response of the human hand-arm system. Rock drillsuspended handle 2 and pneumatic hammer 1 models were developed by researchers for preventive simulation and to control the system elements. Rakheja et al 14 developed a bio-dynamic model based on the driving point mechanical impedance to evaluate the response of each segment in the hand-arm system subjected to vibration exposure.…”

Section: Introductionmentioning

confidence: 99%

Assessment of ergonomically designed handle shapes for low-frequency vibration responses

Tony

Alphin

2018

Proceedings of the Institution of Mechanical Engineers, Part L:

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Hand-operated tool handles transmit a large magnitude of vibration to the hand-arm system during low-frequency operations. Therefore, the precise design of a hand tool is very important to overcome musculoskeletal disorders, hand-arm vibration, etc. This study was aimed at developing optimal tool handles with an increased contact area and to overcome the contact pressure, which causes discomfort and pain. Six different human hand-based optimal handles (handles B to G) and one optimal cylindrical handle (handle A) were designed and fabricated using 3D printing technology, in order to assess the effect of low-frequency vibrations. The effect of handle shapes was evaluated with objective and subjective measurements using 15 subjects. Objective measurements were performed to assess the vibration transmissibility by experimental study at the frequency range of 0–100 Hz, and subjective measurements were performed to rate the handles based on comfort descriptors and overall comfort of the handles. Root mean square vibration accelerations were recorded at the wrist, elbow, and shoulder of each subject and at the base of the handle fixture to evaluate the vibration transmissibility for each handle. The mean vibration transmissibility was found to be minimum for handle B and was rated to be more comfortable by the subjects. The results indicated that all the human hand-based handles transmit less vibration and were rated to be more comfortable than the optimal cylindrical handle.

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“…Thus, the dominant frequency for the underground locomotive is more in-line with surface locomotive vehicles [55], and other equipment that is driven such as load-haul dump vehicles [56], and harvesters [57]. This is in contrast to the dominant FTV observed for raise workers, which is in line with the dominant frequency associated with the operation of jackleg and stopper drills [58]. …”

Section: Field Study Of Ftv Exposure and Reported Symptomsmentioning

confidence: 92%

Vibration induced white-feet: Overview and field study of vibration exposure and reported symptoms in workers

Eger

Thompson

Leduc

et al. 2014

Work

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BACKGROUND Workers who stand on platforms or equipment that vibrate are exposed to foot-transmitted vibration (FTV). Exposure to FTV can lead to vibration white feet/toes resulting in blanching of the toes, and tingling and numbness in the feet and toes. OBJECTIVES The objectives are 1) to review the current state of knowledge of the health risks associated with foot-transmitted vibration (FTV), and 2) to identify the characteristics of FTV and discuss the associated risk of vibration-induced injury. PARTICIPANTS Workers who operated locomotives (n = 3), bolting platforms (n = 10), jumbo drills (n = 7), raise drilling platforms (n = 4), and crushers (n = 3), participated. METHODS A tri-axial accelerometer was used to measure FTV in accordance with ISO 2631-1 guidelines. Frequency-weighted root-mean-square acceleration and the dominant frequency are reported. Participants were also asked to report pain/ache/discomfort in the hands and/or feet. RESULTS Reports of pain/discomfort/ache were highest in raise platform workers and jumbo drill operators who were exposed to FTV in the 40 Hz and 28 Hz range respectively. Reports of discomfort/ache/pain were lowest in the locomotive and crusher operators who were exposed to FTV below 10 Hz. These findings are consistent with animal studies that have shown vascular and neural damage in exposed appendages occurs at frequencies above 40 Hz. CONCLUSIONS Operators exposed to FTV at 40 Hz appear to be at greater risk of experiencing vibration induced injury. Future research is required to document the characteristics of FTV and epidemiological evidence is required to link exposure with injury.

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Design of a suspended handle to attenuate rock drill hand-arm vibration: model development and validation

Cited by 16 publications

References 5 publications

Recent Advances in Biodynamics of Human Hand-Arm System

Recent Advances in Biodynamics of Human Hand-Arm System

Assessment of ergonomically designed handle shapes for low-frequency vibration responses

Vibration induced white-feet: Overview and field study of vibration exposure and reported symptoms in workers

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