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Your search keyword '"Jönsson J"' showing total 24 results
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24 results on '"Jönsson J"'

8. Molecular monolayers on silicon as substrates for biosensors

Author

Touahir, L., primary, Allongue, P., additional, Aureau, D., additional, Boukherroub, R., additional, Chazalviel, J.-N., additional, Galopin, E., additional, Gouget-Laemmel, A.C., additional, de Villeneuve, C. Henry, additional, Moraillon, A., additional, Niedziółka-Jönsson, J., additional, Ozanam, F., additional, Andresa, J. Salvador, additional, Sam, S., additional, Solomon, I., additional, and Szunerits, S., additional

Published
2010
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13. Surface processes before and during growth of GaAs (001)

Author

Ploska, K., primary, Zettler, J.-Th., additional, Richter, W., additional, Jönsson, J., additional, Reinhardt, F., additional, Rumberg, J., additional, Pristovsek, M., additional, Zorn, M., additional, Westwood, D., additional, and Williams, R.H., additional

Published
1994
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24. Experimental identification of pedestrian-induced lateral forces on footbridges

Author

Einar Thór Ingólfsson, Francesco Ricciardelli, Christos T. Georgakis, Jeppe Jönsson, Ingólfsson, E. T., Georgakis, C. T., Ricciardelli, Francesco d'Assisi, and Jönsson, J.

Subjects
Acoustics and Ultrasonics, Mechanical Engineering, Acoustics, Phase (waves), Moving load, Low frequency, Condensed Matter Physics, Vibration, Acceleration, Amplitude, Mechanics of Materials, Range (statistics), Treadmill, human activities, Simulation, Mathematics
Abstract

This paper presents a comprehensive experimental analysis of lateral forces generated by single pedestrians during continuous walking on a treadmill. Two different conditions are investigated; initially the treadmill is fixed and then it is laterally driven in a sinusoidal motion at varying combinations of frequencies (0.33–1.07 Hz) and amplitudes (4.5–48 mm). The experimental campaign involved 71 male and female human adults and covered approximately 55 km of walking distributed between 4954 individual tests. When walking on a laterally moving surface, motion-induced forces develop at the frequency of the movement and are herewith quantified through equivalent velocity and acceleration proportional coefficients. Their dependency on the vibration frequency and amplitude is presented, both in terms of mean values and probabilistically to illustrate the randomness associated with intra- and inter-subject variability. It is shown that the motion-induced portion of the pedestrian load (on average) inputs energy into the structure in the frequency range (normalised by the mean walking frequency) between approximately 0.6 and 1.2. Furthermore, it is shown that the load component in phase with the acceleration of the treadmill depends on the frequency of the movement, such that pedestrians (on average) subtract from the overall modal mass for low frequency motion and add to the overall modal mass at higher frequencies.

Published
2011
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