Mechanical models for the analysis of footfall-induced vibrations
Common methods for the numerical analysis of pedestrian-induced vibrations are mostly based on simplistic approaches which consider the pedestrian as a moving force, i.e. a concentrated (time dependent) load travelling at a constant walking speed over the investigated structure. However, this approach is likely to overestimate the structural response, especially in case of lightweight structures, as it neglects the interaction between the pedestrian and the structure. Therefore, various numerical models have been developed in order to take the human-structure interaction into account. The main idea is to define a coupled system (human-structure), which is able to describe the human body by its equivalent dynamic parameters, i.e. mass, stiffness and damping coefficient. The level of detail varies from representing the subject only by its moved mass towards more realistic assumptions, such as a moving spring-mass-damper system or even bipedal models, which can represent the human body by its physical biomechanical parameters, i.e. body mass located at the physical center of mass as well as spring and damping coefficients for each leg.
The main aim of the proposed project consists in developing a novel numerical model for the analysis of human-structure-interaction based on the biomechanical model of a spring loaded inverted pendulum (SLIP). It considers a bipedal representation of the human body by its mass and a time-dependent linear spring for each leg. The mechanical parameters of the SLIP model for walking on flexible structures are to be determined by measurements on the experimental HUMVIB-Bridge of the Institute of Structural Mechanics and Design. Comparisons of the SLIP-results with other models available in the literature as well as with measurements on the HUMVIB-Bridge are envisaged. Fundamental knowledge in structural dynamics is explicitly required, while basic Matlab skills are desirable.
Two IREP students can work on this project
Pre-requisites or requirements for the project
- Fundamental knowledge in Structural Dynamics
- MATLAB skills
Recommended literature and preparation
CAPRANI, C. C.; AHMADI, E.: Formulation of human–structure interaction system models for vertical vibration. In: Journal of Sound and Vibration (2016), p. 346–367.
SHAHABPOOR, E. ; PAVIC, A. ; RACIC, V.: Interaction between Walking Humans and Structures in Vertical Direction : A Literature Review. In: Shock and Vibration (2016), Nr. 1, p. 1–22.
until the end of June 2018