Ein mechanisches Modell f�r das schwingungserregte Hand-Arm-System des Menschen

Dieckmann, Dieter

doi:10.1007/bf00695204

Cited by 11 publications

(10 citation statements)

References 6 publications

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“…At this frequency resonance evidently takes place in cutaneous, subcutaneous, and muscle tissues. Probably this resonance caused the peaks in the mechanical impedance noticed by some investigators (5,29).…”

Section: Frequency Response Of the Hand-arm Systemmentioning

confidence: 91%

“…No significant resonance frequencies were observed. However, if one considers the joints in the hand-arm system as springs in a massive spring 'System, resonance frequencies should exist (5,29). The elbow joint is supported by connective tissue and muscles in such rigidity that the resonance frequencies probably occur at high frequencies outside the range used in our tests.…”

Section: Frequency Response Of the Hand-arm Systemmentioning

confidence: 96%

“…Different mechanisms for the attenuation of vibration have been developed, e.g., protective (absorbing) gloves, rubber and spring insulators, balanced engines, etc. (5,7,22). Protective gloves do not reduce the level of vibration, but they do interfere with work safety (22,34).…”

Section: Protective Measuresmentioning

confidence: 99%

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Transmission of vibration in the hand-arm system with special reference to changes in compression force and acceleration.

Pyykkö¹,

Färkkilä²,

Toivanen³

et al. 1976

Scand J Work Environ Health

128

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A handle with strain gauges attached ·was used to study the effect of compression force (10, 20 and 40 N) and constant acceleration (1, 3 and 10 g) on the transmission of vibration at frequencies from 20 to 630 Hz. In the curves recorded, sharp dips appeared which were evidently caused by resonances from the soft tissues of the hand. However in the hand-arm system no common resonance frequency was observed that would harmfully affect the health of workers. Vibration in the hand-arm system was attenuated at an average of 3 dB per octave at the frequencies between 20 and 100 Hz. Between 100 and 630 Hz the attenuation was about 6 dB per octave in the wrist and 10 dB per octave in the elbow and upper arm. At the frequency of 630 Hz the attenuation was hence about 35 dB in the wrist and about 45 dB in the elbow. The attenuation of vibration in the elbow joint was 2 to 4 dB at all frequencies. The hand-arm system appears to be linear at the acceleration range considered; the increase)n handle vibration by, e.g., 10 dB also increased vibration in the hand by 10 dB. When the grip strength was increased fourfold, Le., 12 dB, vibration increased only 3 to 5 dB in the hand-arm system. Thus changing the weight of a vibrating tool does not reduce vibration enough. Therefore attempts to reduce Vibration should concentrate on the mechanical parts of the engines.

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Section: Frequency Response Of the Hand-arm Systemmentioning

confidence: 91%

Section: Frequency Response Of the Hand-arm Systemmentioning

confidence: 96%

See 1 more Smart Citation

Transmission of vibration in the hand-arm system with special reference to changes in compression force and acceleration.

Pyykkö¹,

Färkkilä²,

Toivanen³

et al. 1976

Scand J Work Environ Health

128

View full text Add to dashboard Cite

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“…It would be a hopeless task to give an exact description of this complex system with respect to all kinds of excitation of the whole frequency range, not forgetting the fact that there is a great variation as to the individual. Biodynamic models for the human body have, however, been constructed by several authors (for example , Dieckmann 1958, Dieckmann 1959, Edwards & Lange 1964, Franke 1951, Muksian & Nash 1974, O'Hara 1966, Sandover 1971, Suggs et al 1969, Vogt et al 1968, Vogt et al 1973, Weis et al 1964 and have also been authorized in two international standards (ISO 5982 1981, ISO 7962 1987. For the hand and arm no international standard has been presented, but in the working-group ISO/TC 108/SC 4/WG 5 -"Biodynamic modelling" -such a standard is in preparation.…”

Section: Theory For Vibration Energy Estimationmentioning

confidence: 99%

Absorption of vibration energy in the human hand and arm

1994

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A possible basis for the risk assessment for hand-transmitted vibration may be to determine the amount of energy absorbed in the human hand and arm. In the present study, the mechanical energy absorption in the hand-arm system was measured within the frequency range of 4 to 1000 Hz. The study was carried out on ten healthy subjects during exposure to sinusoidal vibration. The influence of various experimental conditions, such as vibration direction (Xh, Yh, Zh), grip force (25-75 N), vibration level (8-45 mm/srms), and hand-arm posture were studied. The outcome shows that the energy absorption in the human hand and arm depended mainly on the frequency and direction of the vibration stimulus. Higher vibration levels, as well as firmer handgrips, resulted in higher absorption of energy. Varying hand-arm postures had only a small influence on the amount of absorbed energy, while the constitution of the hand and arm affected the energy absorption to a larger extent.

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“…Evidence has been presented where in some cases the vibration response characteristics of the hand and arm differ depending upon whether the signal is a discrete frequency signal or a signal consisting of several frequencies [5,35]. In the international literature, a great number of reports can be found where the mechanical impedance of the hand-arm system has been studied [2,5,7,8,10,11,16,18,19,23,24,25,27,29,30,31,33,34,37,38,39]. However, these studies do not generally show close agreement.…”

Section: Introductionmentioning

confidence: 99%

The influence of biodynamic factors on the mechanical impedance of the hand and arm

Burström

1997

International Archives of Occupational and Environmental Health

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The purpose of this study was to investigate the mechanical impedance of the human hand-arm system during exposure to random vibration under various experimental conditions and to evaluate statistically whether these experimental conditions have any influence on magnitude and phase of the mechanical impedance. A further aim was to compare the obtained results with other investigations where sinusoidal excitation has been used. The mechanical impedance was estimated in ten healthy subjects during exposure to random vibration, with a constant velocity spectrum within the frequency range 4-2000 Hz, by use of a specially designed laboratory handle. In the study, the influence of various conditions, such as vibration direction (Xh, Yh, Zh), grip force (25-75 N), feed force (20-60 N), frequency-weighted acceleration level (3, 6, 9, 12 m/s2) and hand and arm posture (five flexions, two abductions) were studied. The outcome showed that the vibration direction and the frequency of the vibration stimuli have a strong significant influence on the impedance of the hand. An increased vibration level resulted in a significantly lower impedance for frequencies over 100 Hz. Increase grip and feed forced led on the other hand to an increased impedance for all frequencies. With regard to hand and arm posture, the results show that the flexion and abduction had a significant contribution for frequencies below 30 Hz. Furthermore, the influence of some of the studied variables had a non-linear effect on the impedance but also differed between different exposure directions. It was concluded, moreover, that the vibration response characteristics of the hand and arm differ, depending whether the signal is a discrete frequency signal or a signal consisting of several frequencies.

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Ein mechanisches Modell f�r das schwingungserregte Hand-Arm-System des Menschen

Cited by 11 publications

References 6 publications

Transmission of vibration in the hand-arm system with special reference to changes in compression force and acceleration.

Transmission of vibration in the hand-arm system with special reference to changes in compression force and acceleration.

Absorption of vibration energy in the human hand and arm

The influence of biodynamic factors on the mechanical impedance of the hand and arm

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