✦ LIBER ✦

The impact response of the seated subject

✍ Scribed by Holger Broman; Malcolm H. Pope; Michal Benda; Magnus Svensson; Charlotte Ottosson; Tommy Hansson

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 407 KB
Volume: 9
Category: Article
ISSN: 0736-0266
DOI: 10.1002/jor.1100090118

No coin nor oath required. For personal study only.

✦ Synopsis

An impact method for establishing the dynamic response of the seated subject is introduced. The method employs a pendulum to apply the impact to the suspended seat. Pins are placed in the spinous process at L3. Highly reproducible results are obtained. The results were not affected by the amplitude of impact, implying a linear system. A marked peak of transmissibility is found in the 4-5 Hz range and an attenuation peak is found close to 8 Hz. Both muscle contraction and postural changes affect the dynamic response. A relaxed posture shows greater gain and attenuation peaks. A valsalva stiffens the system and reduces the effective damping. The vertical response of the body probably shows in the 5-6 Hz peak, while the rotational response is probably encompassed in the 8 Hz attenuation peak.

📜 SIMILAR VOLUMES

Assessing the subjective impact of louds

Assessing the subjective impact of loudspeaker response errors

✍ A.P. Watson; K. Attenborough; N.W. Heap 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 561 KB

Nonlinear subjective and dynamic respons

Nonlinear subjective and dynamic responses of seated subjects exposed to horizontal whole-body vibration

✍ G.H.M.J. Subashi; N. Nawayseh; Y. Matsumoto; M.J. Griffin 📂 Article 📅 2009 🏛 Elsevier Science 🌐 English ⚖ 528 KB

Lower limb contribution to the dynamic r

Lower limb contribution to the dynamic response of the seated man

✍ Pierre Lemerle; Philippe Boulanger 📂 Article 📅 2006 🏛 Elsevier Science 🌐 English ⚖ 380 KB

The response of layered aluminum nitride

The response of layered aluminum nitride targets subjected to hypervelocity impact

✍ Karl Weber; Timothy J. Holmquist; Douglas W. Templeton 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 549 KB

This work presents both experimental and computational ballistic results of layered Aluminum Nitride (A1N) targets. An L/D = 6 tungsten penetrator is used to impact AlN targets at a nominal impact velocity of 2100m/s. The primary objective of this work is to determine the ballistic performance of la

VERTICAL VIBRATION TRANSMISSION THROUGH

VERTICAL VIBRATION TRANSMISSION THROUGH THE LUMBAR SPINE OF THE SEATED SUBJECT—FIRST RESULTS

✍ A. El-Khatib; F. Guillon; A. Dômont 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 202 KB

Seven fresh, not embalmed, cadavers (58•1 2 6•6 years, 73 2 10•3 kg, 170•7 2 6•5 cm) were submitted, in the week following their death (7•1 2 3•1 days), to a whole-body vertical broad-band white random vibration in the bandwidth 0•8 to 25 Hz of about 1•5 m/s 2 r.m.s. Two postures were tested using t

On the response of curved laminated pane

On the response of curved laminated panels subjected to transverse impact loads

✍ Laura S Kistler; Anthony M Waas 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 622 KB

Using static response characteristics as a tool for understanding impact response\ the in~uence of in!plane and out!of!plane boundary conditions\ the e}ect of curvature\ and the validity of linear and nonlinear plate theory are investigated for the transverse central impact on thin \_ber reinforced