Institute of Fundamental Technological Research
Polish Academy of Sciences


A. Ortiz

Universidad del Norte (CO)

Conference papers
1.  Ortiz A.R., Błachowski B., Hołobut P., Franco J.M., Marulanda J., Thomson P., Modeling and Measurement of a Pedestrian's Center-of-Mass Trajectory, 35th IMAC, XXXV International Modal Analysis Conference, A Conference and Exposition on Structural Dynamics 2017, 2017-01-30/02-02, Garden Grove, CA. (US), DOI: 10.1007/978-3-319-54777-0_20, Vol.2, pp.159-167, 2017

This paper presents the measurement and model updating of a pedestrian's center of mass trajectory. A mathematical model proposed by the authors is updated using the actual trajectory of a pedestrian. The mathematical model is based on the principle that a human's control capability tries to maintain balance with respect to the pedestrian's center of mass (CoM), independently of the surface type. In this research, the human is considered as a mass point concentrated at CoM. The parameters of the models are updated using experimental identification of the human walking trajectory on a rigid surface. The proposed measurement technique uses a depth sensor, which enable skeletal tracking of the pedestrian walking on rigid or flexible structures. Experiments were performed using a mobile platform with the time-of-flight commercial camera Microsoft Kinect for Windows 2.0. The velocity of the mobile platform is set to maintain a 1 m separation from the pedestrian in order to provide high resolution. The results of the measurement technique allowed the identification of the human's CoM trajectory. The results of the model updating process present the probability density function of the parameters which could be used for modeling the CoM's trajectory of the pedestrian.

Human-structure interaction, Pedestrian's trajectory, Human-induced vibrations, MS Kinect sensor

Ortiz A.R. - Universidad del Norte (CO)
Błachowski B. - IPPT PAN
Hołobut P. - IPPT PAN
Franco J.M. - Universidad del Valle (CO)
Marulanda J. - Universidad del Valle (CO)
Thomson P. - Universidad del Valle (CO)
2.  Błachowski B., Hołobut P., Ortiz A., Caicedo J.M., Simple human-structure interaction model of walking on a flexible surface, ISMA 2016 / USD 2016, International Conference on Noise and Vibration Engineering / International Conference on Uncertainty in Structural Dynamics, 2016-09-19/09-21, Leuven (BE), pp.559-570, 2016

We present a new human-structure interaction (HSI) model of walking on a flexible surface. A human is considered as a mass point, located at the body’s center of mass (COM). The mass moves along a predefined trajectory, which deforms together with the surface on which the human walks. The forces of motion, equal to the sum of inertial and gravitational forces acting on the mass, are transfered to the surface at prescribed foot positions. The motion of the surface is described using a few selected mode shapes, corresponding damping ratios, and natural frequencies. The equations of motion of the system are time-dependent and discontinuous. They can be written in the form of the second order differential equations of structural dynamics, but with the right-hand forcing dependent on the deformation of the surface. We present a numerical example of a human walking on a long beam structure. The motion of the beam is described by three mode shapes, representing its vertical, lateral, and torsional deflections.

Human induced vibrations, Dynamics of bridges, Human walking model

Błachowski B. - IPPT PAN
Hołobut P. - IPPT PAN
Ortiz A. - Universidad del Norte (CO)
Caicedo J.M. - University of South Carolina (US)

Category A Plus


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