Hand-arm vibration, part II: Vibration transmission characteristics of the hand and arm

Reynolds, Douglas D.; Angevine, Eric Neil

doi:10.1016/s0022-460x(77)80035-7

Cited by 76 publications

(41 citation statements)

References 2 publications

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“…A high level of the combined applied force and dynamic load may cause the excessive stresses and deformations and thus be harmful to the hand-arm system. At relatively low frequencies (≤ 40 Hz), the vibration can be effectively transmitted to the arm 40,41) . Therefore, a large portion of the low frequency force acting on the palm can be effectively transmitted to the wrist, elbow, and shoulder.…”

Section: Discussionmentioning

confidence: 99%

Estimation of Biodynamic Forces Distributed on the Fingers and the Palm Exposed to Vibration

Dong¹,

Welcome²,

Wu³

2005

Ind Health

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The hand-tool coupling force in the operation of a vibrating tool is generally composed of applied force (AF) and biodynamic force (BF). There is wide interest in quantifying the coupling force. The objectives of this study are to develop an effective method for estimating the BF and to investigate its fundamental characteristics. Using the biodynamic response of the hand-arm system, such as apparent mass or mechanical impedance, and the acceleration that can be measured on vibrating tools, this study proposed an indirect method for the BF estimation. The BFs distributed on the fingers and the palm of the hand along the forearm direction (z h -axis) in the operations of eighteen types of tool were estimated and used to identify the distributed BF characteristics. The results indicate that the BFs depend on both the tool vibration spectrum and the biodynamic properties of the hand-arm system. The dominant BF frequency component is usually at the same frequency as the dominant vibration frequency of each tool. The BF distributed on the palm (2-98 N) is much higher than that distributed on the fingers (1-30 N) at frequencies less than 100 Hz, but these biodynamic forces (2-22 N) are comparable at higher frequencies. The palm BF on several tools with relatively low dominant frequencies (≤ 40 Hz), especially in the resonant frequency range (16-40 Hz), is comparable with the applied palm force (50-100 N). Since the resonant frequency of the palm BF is also in the range of the dominant vibration frequencies of many percussive tools, the palm BF may be related to the disorders in the wrist-arm system. The BF on the fingers is likely to be closely related to the dynamic stresses and deformations in the fingers and it may thus be used to quantify the finger vibration exposure.

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Section: Discussionmentioning

confidence: 99%

Estimation of Biodynamic Forces Distributed on the Fingers and the Palm Exposed to Vibration

Dong¹,

Welcome²,

Wu³

2005

Ind Health

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“…Like an anti-vibration glove, the isolation effectiveness of the palm spring-damping system depends on vibration frequency. At low frequencies (<40 Hz), the palm cannot effectively isolate vibration, so the vibration can be effectively transmitted to the entire hand-arm system [25][26] , and a large percentage of the hand-arm system mass is involved in the low-frequency motion. Therefore, a larger hand-arm size can provide more mass to the response and result in a positive correlation between the anthropometrics and the magnitude of the biodynamic response.…”

Section: Discussionmentioning

confidence: 99%

“…A larger hand may have more tissue in contact with the handle thus resulting in a higher response. At such frequencies, the vibration cannot be transmitted beyond the hand 25,26) , and the energy absorption is likely limited to the local hand tissues. The VPA values at the high frequencies are also relatively low.…”

Section: Discussionmentioning

confidence: 99%

“…Depending on the frequency characteristics, vibration generated from different tools can be transmitted to different parts of the hand-arm system 25,26) , and may cause various problems at these different locations 2,3,27) . It has been reported that the nature of the vibration power transmitted to the palm is much different from that into the fingers 28) and that the mechanical impedance distributed at the fingers is very different from that at the palm of the hand 29) .…”

Section: Introductionmentioning

confidence: 99%

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Biodynamic Response at the Palm of the Human Hand Subjected to a Random Vibration

Dong¹,

McDowell²,

Welcome³

2005

Ind Health

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This study investigated the biodynamic response (BR) distributed at the palm of the hand subjected to a random vibration. Twelve male subjects were used in the experiment. Each subject applied three coupling actions (grip-only, push-only, and combined grip and push) on a simulated tool handle at three different levels (50, 75, and 100 N) of palm force. This study found that the hand-arm system resonated mostly in the frequency range of 20 to 50 Hz, depending on the specific test treatment and individual characteristics. The maximum vibration power transmission through the palm occurred at the resonant frequency. Increasing the effective palm force generally increased the BR magnitude and resonant frequency. The apparent stiffness measured at the middle frequencies (80-100 Hz) is correlated to the BR in almost the entire frequency range (20-1,000 Hz). Under the same palm force, the push-only action corresponded to the highest BR values while the grip-only action generally produced the lowest values. Since the resonant frequency range matches the dominant vibration frequency range of many percussive tools, it is anticipated that the palm BR and vibration power transmission may have an association with vibration-induced injuries or disorders in the wrist-arm system among the workers using these tools.

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“…Vibration with a frequency of more than 1000 Hz is generated from these handpieces (13). Vibration at frequencies above 150-200 Hz tends to be isolated to areas of the hands and fingers directly in contact with the vibrating tool (14), and any adverse effect of high-frequency vibration should be limited to the structures in direct contact with the instruments. Thus, there is hardly any possibility that they can be transmitted through the hand of the dentist or through the oral tissues of the treated patient from the three first fingers to the fifth .…”

Section: Discussionmentioning

confidence: 99%

Sensory perception in the hands of dentists.

Ekenvall

By²,

Falconer³

1990

Scand J Work Environ Health

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Hand-arm vibration, part II: Vibration transmission characteristics of the hand and arm

Cited by 76 publications

References 2 publications

Estimation of Biodynamic Forces Distributed on the Fingers and the Palm Exposed to Vibration

Estimation of Biodynamic Forces Distributed on the Fingers and the Palm Exposed to Vibration

Biodynamic Response at the Palm of the Human Hand Subjected to a Random Vibration

Sensory perception in the hands of dentists.

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