Mr. Lars Pedersen Profile

Lars Pedersen

PhD Student at Aalborg Univ

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Proceedings Article | 17 March 2006 Paper

Damping added to floors by seated crowds of people

Lars Pedersen

Proceedings Volume 6169, 61690P (2006) https://doi.org/10.1117/12.658579

KEYWORDS: Modeling, Chromium, Vibration control, Solids, Calibration, Safety, Vibrometry, Data modeling, Analytical research, Motion models

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Floor damping is an essential parameter in the evaluation of the dynamic performance of a floor as the amount of floor damping has a significant impact on floor vibration levels. This paper explores the not well understood relationship between floor damping and seated crowds of people. The paper contributes to the understanding by presenting results of controlled experimental investigations that involved crowds of people sitting on a vibrating test floor. In tests, floor damping and floor frequency are identified for various sizes of the crowd. This in itself throws some light on the not well understood relationship, but it is further investigated whether modelling the human crowd as a single-degree-of-freedom spring-mass-damper system attached to the vibrating floor can explain the recorded floor frequency and damping. Thus, a crowd-floor interaction model describes the combined crowd-floor system, and results show that this model is capable of explaining the overall tendency in recorded floor damping and frequency, and the calibration of the interaction model gives some indications of the frequency and damping of the spring- mass-damper system representing the crowd. The paper describes the tests and the methods used to evaluate the appropriateness of modelling a crowd as a spring-massdamper system. Some implications of the observed crowd-floor interaction are discussed in light of the results.

Proceedings Article | 29 July 2004 Paper

Human damping and its capacity to control floor vibrations

Lars Pedersen, Lars Hansen

Proceedings Volume 5386, (2004) https://doi.org/10.1117/12.539931

KEYWORDS: Francium, Oscillators, Modeling, Systems modeling, Vibration control, Data modeling, Sensors, Analytical research, Control systems, Dynamical systems

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This paper addresses a damping mechanism not often considered although typically present. The damping mechanism in question is that originating from stationary humans (standing or sitting) on floors. Floors may encounter vertical vibrations due to actions of humans in motion. The vibrations hereby generated can be a problem because stationary humans are excellent vibration sensors and may perceive vibrations as being discomforting. This paper demonstrates that in addition to acting as receivers/perceivers, stationary humans can also add significant damping to the floor which they occupy; and thus assist in reducing the discomforting vibrations. In the analyses the stationary crowd of people are modelled as an auxiliary (spring-mass-damper) system attached to the floor. Experimental results reported in this paper show that this modelling approach is reasonable even though a rigid mass assumption is often used. The latter model does not account for a human damping mechanism. Implications of its presence are evaluated for a set of floors. These evaluations also encompass the scenario that a tuned mass damper (TMD) is fitted to the floor so as to mitigate excessive floor resonant vibrations. The effectiveness of such TMD is shown to reduce substantially during the presence of stationary humans on the floor.

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