Einflu� vertikaler mechanischer Schwingungen auf den Menschen

Dieckmann, Dieter

doi:10.1007/bf00693758

Cited by 23 publications

(6 citation statements)

References 9 publications

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“…Head acceleration transmissibility's (HAT) primary resonance frequency (4.5-5 Hz) and magnitudes are in agreement with previous literature (Messenger and Griffin 1989;Sandover 1982;Wilder et al 1982;Dieckmann 1957;Coermann et al 1960;Griffin et al 1979;Griffin 1975;Paddan and Griffin 1988;Seidel et al 1986). As with several other measures in this study (Table 1), HAT exhibited differing responses dependent on pelvic orientation and frequency range.…”

Section: Discussionsupporting

confidence: 88%

“…A number of studies have quantified the human's mechanical response to WBV in terms of transmissibility (Cohen et al 1977;Dieckmann 1957;Garg and Ross 1976;Griffin 1975;Messenger and Griffin 1989;Paddan and Griffin 1988;Park 1991;Rowlands 1977;Sandover 1982;Wilder et al 1982) and impedance (Coermann et al 1960;Dieckmann 1957;Miwa 1975;Sandover 1982;Weis et al 1964;Wilder et al 1982), yet these studies seldom take into account the trunk musculature's role of postural maintenance (Asmussen 1960;Floyd and Silver 1955;Portnoy and Morin 1956). However, sitting is a dynamic activity (Branton 1969), and this implies changing demands on the musculoskeletal system as seated postures are changed.…”

Section: Introductionmentioning

confidence: 99%

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Effects of vibration frequency and postural changes on human responses to seated whole-body vibration exposure

Zimmermann

Cook

1997

International Archives of Occupational and Environmental Health

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The present investigation evaluated the effects of changes in pelvic orientation and vibration frequency on the seated human's response to wholebody vibration (WBV). Seat-to-trunk and seat-to-head acceleration transmissibility, peak-to-peak pelvic motion and erector spinae EMG and mean erector spinae EMG was collected across three pelvic orientations (9 degrees anterior pelvic tilt, neutral pelvis, and 9 degrees posterior pelvic tilt) and frequencies ranging from 4.5 to 16 Hz. Subjects included 30 healthy males between the ages of 18 and 35. Ensemble averages, two vibration cycles in length, were produced for each subject within each frequency-pelvic orientation combination. Group ensemble averages within each frequency-pelvic orientation combination were then compared using ANOVA. Changes in pelvic orientation produced significant differences in acceleration transmissibility, pelvic motion, and erector spinae EMG. At frequencies below 6 Hz, acceleration transmissibility at the head and pelvic motion were significantly greater in the posterior pelvic orientation than in the other two. At frequencies above 6 Hz, acceleration transmissibility at the head and trunk were significantly greater in the anterior pelvic orientation than in the other two. Peak-to-peak EMG responses were similar across all pelvic orientations at frequencies below 6 Hz. However, above 6 Hz, the response was significantly greater in the anterior pelvic orientation than in the other two. Thus, vibration frequency and pelvic orientation were shown to have significant interactive effects on the seated human's response to WBV. These interactive effects need to be considered when determining appropriate vibration exposure guidelines.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Effects of vibration frequency and postural changes on human responses to seated whole-body vibration exposure

Zimmermann

Cook

1997

International Archives of Occupational and Environmental Health

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“…The main acoustic resonances of the human body are around 10 Hz. 21,25 Thus, slightly higher frequencies as for instance at about 50 Hz appear promising for acoustic phase imaging. However, one has to consider that acoustic excitations are damped to amplitude levels of about 5% when propagating along the human body.…”

Section: Discussionmentioning

confidence: 99%

Terahertz imaging of concealed objects by acoustic phase detection

Buersgens¹,

Acuna²,

Kersting³

2008

SPIE Proceedings

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We present a novel technique for detecting objects that are concealed by textiles. Items of virtually all materials can be sensed, which includes metals as well as dielectrics. Our technique detects the acoustic phase lag of objects when they follow a driven oscillation. The acoustic phase is measured interferometrically with continuous wave radiation at about 77 GHz. Typical oscillation amplitudes are about 1 µm, which is close to the human perception level. The technique provides no insight into the concealed item's material properties. It exclusively shows whether or not an object is hidden, which is the most relevant information for many sensing applications.

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“…Daher ist von keiner signifikanten Belastung durch die akustischen Schwingungen auszugehen. Hierfür spricht auch die physiologische Wahrnehmungsschwelle, die bei Amplituden um 1 µm liegt [13].…”

Section: Messtechnikunclassified

Abbildung akustischer Phasenverzögerungen mit Terahertz- und Millimeterwellen-Techniken (Mapping the Acoustic Phase with Terahertz and Millimeter Wave Techniques)

Kersting¹,

Buersgens²,

Acuna³

2008

Tm - Technisches Messen

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Versteckte Objekte können detektiert werden, indem ihre Phasenverzögerung gegenüber einer äußeren akustischen Schwingung mittels Terahertz-oder Millimeterwellenstrahlung erfasst wird. Die Sensitivität der Technik umfasst metallische wie auch dielektrische Körper. Bereits Schwingungsamplituden nahe der physiologischen Wahrnehmungsschwelle um 1 µm ermöglichen eine Detektion. Hierdurch ergeben sich insbesondere im Sicherheitsbereich Anwendungsperspektiven.Objects behind an opaque barrier become visible when imaging the object's phase lag to a driving acoustic oscillation with terahertz or millimeter wave radiation. The sensitivity of the developed technique covers metallic as well as dielectric objects. Oscillation amplitudes can be as small as 1 µm, which are comparable to the human perception level. The application for security technology is discussed.

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Einflu� vertikaler mechanischer Schwingungen auf den Menschen

Cited by 23 publications

References 9 publications

Effects of vibration frequency and postural changes on human responses to seated whole-body vibration exposure

Effects of vibration frequency and postural changes on human responses to seated whole-body vibration exposure

Terahertz imaging of concealed objects by acoustic phase detection

Abbildung akustischer Phasenverzögerungen mit Terahertz- und Millimeterwellen-Techniken (Mapping the Acoustic Phase with Terahertz and Millimeter Wave Techniques)

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