6926475957

crosa-sectional araes by 10 and 50%, and, finally, two struc-tural ełements in the mkłdle of the telescope ware stiffened to rapreaant the addition of a lumped mass locatad away from the control system sensor* and actuators. A control tyatem of 21 collocated sensor* and actuators, positioned at the top and bottom of the telescope, was used in this analysis. The analysis was accomplished using NASTRAN for the finite element analysis. and. after selecting certa in yfcration modes for further study, the complex conjugate pairs used to determine the damping factors were calculated.

Key Words: Industrial facilities, Low frequencies, Noise generation, Humań response

Over recent yeers, it has become apparent that low frequency noise annoyance is morę widespreed than originally believed. Annoyance has occurred where the emitted noise is u obalane ed towerds the low frequencies even though the d8(A) level has been Iow. Following laboratory experiments carried out as part of an investigation into Iow frequency annoyance combined with field annoyance data, the low frequency noise rating curves are proposed for the assessment of low frequency noise annoyance complaints.

BIOLOGICAL SYSTEMS

HUMAŃ

84-1633

Threrfiolds of Perception of Vibration in Recumbent Men

T. Miwa, V. Yonekawa, and K. Kanada Dept. of Humań Enyironmental Engrg., Natl. Inst. of Industrial Health, 21, Nagao, 6 Chomę Tama-Ku, Kawasaki (214) Japan, J. Acoust. Soc. Amer.. 75 (3). pp 849-854 (Mar 1984) 6 figs, 14 refs

Key Words: Vibration excitation, Humań response

The thresholds of perception of vibrat»n by recumbent men ara a significant index for the governmental agency eon-carned with regulation of vibration exposure. The thresholds of perception of continuous sinusoidal vtorations and single and multiple bursts of sinusoidal vibrations in the horizontal and vertical directions were invettigated in recumbent men. It was found that the threshotd curves, as a function of the fraęuancy, had different characteristics for vertical vibretłons than for horizontal wibrations in the recumbent position.

84-1634

Low Freąuency Noise Annoyance Assessment by Low Frequency Noise Rating (LFNR) Curves

N. Broner and H.G. Leventhall Vipac & Partners Pty Ltd., 30-32 Clarement St., South Yarra, Victoria, Australia 3141, J. Low Fre-quency Noise Vib.._2_ (1), pp 20-28 (1983) 6 figs, 2 tables, 47 refs

84-1635

Patterns of Behaviour in Dwetlings Exposed to Road Traffic Noise

J. Lambert. F. Simonnet. and M. Vallet Institut de Recherche des Transports, Centre d'Evalu-ation et de Recherche des Nuisances et de I'Energie, 109 Avenue Salvador Allende, 69500 Bron, France, J. Sound Vib., 92 (2), pp 159-172 (Jan 22, 1984) 9 figs, 4 tables. 16 refs

Key Words: 8uildings, Traffic noise, Humań response

An inquiry involving a total of 1500 subjects residing in 15 different słtes in the conurbetions of Lyon and Marseilles was carried out in 1979 with a view to determining the behaviour and attitudes of people with regard to traffic noise. The main purpose of the inquiry was to identify the objec* tive reections to the traffic noise and to determine how such reections varied with the noise level. with account taken of the socio-economic characteristics of the subjects (age, income, owner occupier or tenant, etc.).

84-1636

Dynamie Response of the Humań Thormx When Subjected to Frontal Impact

K.H. Digges

Dept. of Engrg. Science. Oxford Univ., UK. Rept. No. OUEL-1453/83, 39 pp (1983)

PB84-136910

Kay Words: Collision research (automotNe), Impact tects, Humań response

The purpose of this report is to documant a model of the human thorax which has been used on a VAX-2 Computer, and to present eome typical results produced by the model. The model uses physical parameters based upon tests re>