PSI - Issue 73

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 73 (2025) 51–57

23rd International Conference on Modelling in Mechanics 2025 Analysis of Damping of a Ball Absorber from Experimentally Obtained Data Marek Kawulok a,b, *, Stanislav Pospíšil a,b a Department of Structural Mechanics, Faculty of Civil Engineering, VSB- Technical University of Ostrava, Ludvíka Podéště 1875/17, 708 00 Ostrava-Poruba, Czech Republic b Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prosecká 809/76, 190 00 Prague 9, Czech Abstract This paper focusses on the analysis of the damping of a ball absorber's motion based on experiments with free oscillations. The experiments were conducted with a ball absorber restricted to planar motion, where its free oscillations were recorded using a video camera. The video footage was then analysed with an algorithm that tracked the centre position of the ball over time, allowing the creation of displacement curves of the ball over time. On the basis of this position information, the angular displacement of the centre relative to its equilibrium position was subsequently calculated. The paper investigates the influence of viscous damping and friction on the motion of the ball, with a particular emphasis on the interaction between the rolling track surface and the ball. A key aspect of the analysis involves comparing two surface variants, one featuring rubber tubing applied to the surface and the other remaining smooth. The findings of this study improve the understanding of damping mechanisms and provide valuable information to select the appropriate damping type in the design of new absorbers or to choose damping models in numerical simulations. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers 23rd International Conference on Modelling in Mechanics 2025 Analysis of Damping of a Ball Absorber from Experimentally Obtained Data Marek Kawulok a,b, *, Stanislav Pospíšil a,b a Department of Structural Mechanics, Faculty of Civil Engineering, VSB- Technical University of Ostrava, Ludvíka Podéště 1875/17, 708 00 Ostrava-Poruba, Czech Republic b Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prosecká 809/76, 190 00 Prague 9, Czech Abstract This paper focusses on the analysis of the damping of a ball absorber's motion based on experiments with free oscillations. The experiments were conducted with a ball absorber restricted to planar motion, where its free oscillations were recorded using a video camera. The video footage was then analysed with an algorithm that tracked the centre position of the ball over time, allowing the creation of displacement curves of the ball over time. On the basis of this position information, the angular displacement of the centre relative to its equilibrium position was subsequently calculated. The paper investigates the influence of viscous damping and friction on the motion of the ball, with a particular emphasis on the interaction between the rolling track surface and the ball. A key aspect of the analysis involves comparing two surface variants, one featuring rubber tubing applied to the surface and the other remaining smooth. The findings of this study improve the understanding of damping mechanisms and provide valuable information to select the appropriate damping type in the design of new absorbers or to choose damping models in numerical simulations. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the event organizers Keywords: Ball absorber; Damping; Viscous damping; Friction damping; Logarithmic decrement; Amplitude Introduction

Keywords: Ball absorber; Damping; Viscous damping; Friction damping; Logarithmic decrement; Amplitude Introduction

* Corresponding author. Tel.: +420-596-991-391. E-mail address: marek.kawulok@vsb.cz * Corresponding author. Tel.: +420-596-991-391. E-mail address: marek.kawulok@vsb.cz

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers

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