Distribution of mechanical impedance at the fingers and the palm of the human hand

Dong, Ren G.; Wu, John Z.; McDowell, Thomas W.; Welcome, Daniel E.; Schopper, Aaron W.

doi:10.1016/j.jbiomech.2004.05.021

Cited by 50 publications

(85 citation statements)

References 22 publications

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“…With these data, the biodynamic effects on the fingers and the rest of the system cannot be differentiated. Our recent study on the response has made the differentiation possible 33) by measuring the biodynamic responses at the fingers and palm of the hand separately.…”

Section: Biodynamic Responsementioning

confidence: 99%

“…Four sets of apparent mass functions measured at the fingers and the palm of the hand obtained in a previous study 33) are used in this study and they are plotted in Fig. 4.…”

Section: Examples Of Bfb Frequency Weightingsmentioning

confidence: 99%

“…The finger resonant peak is not obvious, but the resonant effect makes the finger apparent mass remain at a fairly constant level from 100 Hz to 250 Hz. Because the fingers-applied force on the handle was the same (50 N) in both types of actions, the mass responses at frequencies equal to and higher than 100 Hz are practically the same for both actions 33) . Figure 5(a) shows the finger apparent mass-based weightings calculated from Eq.…”

Section: Examples Of Bfb Frequency Weightingsmentioning

confidence: 99%

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Frequency Weightings Based on Biodynamics of Fingers-Hand-Arm System

Dong

Welcome

2005

Ind Health

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The frequency weighting for assessing hand-transmitted vibration exposure is critical to obtaining a true dose-response relationship. Any valid weighting must have a solid theoretical foundation. The objectives of this study are to examine the biodynamic foundation for assessing the vibration exposure and to develop a set of biodynamic methods to formulate the frequency weightings for different anatomical locations of the fingers-hand-arm system. The vibration transmissibility measured on the fingers, hand, wrist, elbow, shoulder, and head was used to define the transmitted acceleration-based (TAB) frequency weighting. The apparent masses measured at the fingers and the palm of the hand were used to construct the biodynamic force-based (BFB) weightings. These weightings were compared with the ISO weighting specified in ISO 5349-1 (2001). The results of this study suggest that the frequency weightings for the vibration-induced problems at different anatomical locations of the hand-arm system can be basically divided into three groups: (a) the weighting for the fingers and hand, (b) the weighting for the wrist, elbow, and shoulder, and (c) the weighting for the head. The ISO weighting is highly correlated with the weighting for the second group but not with the first and third groups. The TAB and BFB finger weightings are quite different at frequencies lower than 100 Hz, but they show similar trends at higher frequencies. Both TAB and BFB finger weightings at frequencies higher than 20 Hz are greater than the ISO weighting.

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Section: Biodynamic Responsementioning

confidence: 99%

“…Four sets of apparent mass functions measured at the fingers and the palm of the hand obtained in a previous study 33) are used in this study and they are plotted in Fig. 4.…”

Section: Examples Of Bfb Frequency Weightingsmentioning

confidence: 99%

Section: Examples Of Bfb Frequency Weightingsmentioning

confidence: 99%

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Frequency Weightings Based on Biodynamics of Fingers-Hand-Arm System

Dong

Welcome

2005

Ind Health

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“…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) . Because of the exposure variations and the biological structure differences, the pathologic mechanisms of the disorders in the fingers may be quite different from those of the bones, joints, and muscles in the wrist-arm system 30,31) .…”

Section: Introductionmentioning

confidence: 99%

“…While the BR of the entire hand-arm system has been extensively investigated 22,23) and the BRs of the fingers and fingertips have also been reported in a few studies [32][33][34] , only one study reported some information on the mechanical impedance distributed at the palm 29) . Therefore, the palm BR has not been sufficiently studied.…”

Section: Introductionmentioning

confidence: 99%

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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Effect of coating over the handle of a drill machine on vibration transmissibility

Singh¹,

Khan²

2014

Applied Ergonomics

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Distribution of mechanical impedance at the fingers and the palm of the human hand

Cited by 50 publications

References 22 publications

Frequency Weightings Based on Biodynamics of Fingers-Hand-Arm System

Frequency Weightings Based on Biodynamics of Fingers-Hand-Arm System

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

Effect of coating over the handle of a drill machine on vibration transmissibility

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