Local vibrations—Mechanical impedance of the human hand's glabrous skin

Lundström, Ronnie

doi:10.1016/0021-9290(84)90131-3

Cited by 62 publications

(42 citation statements)

References 12 publications

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“…Although the absolute error in the estimation of the handle mass could be small, it could result in a large percentage of error. The impedance phase angles reported by a few investigators 64,76) were close to 90° at high frequencies (>100 Hz), which implies that the hand and fingers could respond almost rigidly in the high frequency range. Dong et al 10) pointed out that this is not a natural phenomenon because the vibration at such frequencies can only be effectively transmitted to the soft tissues of the hand which can effectively absorb or isolate high frequency vibration; otherwise, the high frequency vibration would be effectively transmitted to the arm.…”

Section: Major Problems and Improvements Of Measurement Methodsmentioning

confidence: 67%

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: Major Problems and Improvements Of Measurement Methodsmentioning

confidence: 67%

Recent Advances in Biodynamics of Human Hand-Arm System

Dong

Welcome

2005

INDUSTRIAL HEALTH

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“…Mechanical impedance ( Z ) is a measure of the resistance in a mechanical structure against applied vibrations [14,17].…”

Section: B Mechanical Impedancementioning

confidence: 99%

“…Mechanical impedance is an important measure relating force to position (and/or its derivatives). Numerous previous studies have investigated the mechanical impedance properties of the human skin for developing biomechanics models that can guide the design of new haptic devices [14][15][16][17][18]. In the present study, we first determined the mechanical impedance of our apparatus in unloaded condition, and then in loaded condition with the human hand as the load.…”

Section: Introductionmentioning

confidence: 99%

Detection Threshold and Mechanical Impedance of the Hand in a Pen-Hold Posture

Israr

Choi

Tan

2006

2006 IEEE/RSJ International Conference on Intelligent Robots and Systems

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-We report position and force detection thresholds for sinusoidal waveforms in the frequency range 10-500 Hz delivered through a stylus. The participants were required to hold the stylus in a way similar to that of holding the stylus of a force-feedback device. A minishaker moved the stylus along its length so that the majority of vibrations were presented tangentially to the skin of the hand. The measured position thresholds decreased initially with an increasing stimulus frequency and formed a U-shaped curve in the high frequency region. The thresholds of high frequency vibrations were lower than those reported previously for vibrations that were perpendicular to the skin, but were similar to the thresholds reported earlier using vibrations that were tangential to the skin. A similar force threshold curve was obtained using a force sensor attached to one end of the stylus. Mechanical impedance of the skin derived from velocity estimates and force measurements indicated that the skin and tissues in the hand holding the stylus can be modeled with mass-, damper-and spring-like elements. A comparison of the mechanical impedance from the present study with those reported previously showed similar results for vibrations delivered in the tangential and normal directions to the skin.

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“…Low-frequency vibration generated by tools requi ring a full handgrip is absorbed and dampened in the whole hand-wrist system and might therefore even affect the ner ves in the carpal tunnel area. Howe ver, with the use of grinding instruments utilizing high-frequency vibration, the vibration is damped in the skin, and therefore exposed subjects might develop a lesion pattern diffe rent from that of th ose exposed to low-frequency vibration (12,20). Vibration at higher frequencies has been sho wn to transmit mor e energy to the hand than an eq ual level of lower frequencies weighted according to ISO 5349 (21,22).…”

Section: Discussionmentioning

confidence: 99%

“…Vibration skin receptors are very sensitive to vibration in the frequency of 100 to 300 Hz, which is the resonance frequency of the skin (20). Thus vibration above this frequency might not give adequate warning information about noxious vibration exposure.…”

Section: Discussionmentioning

confidence: 99%