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Analysis of Vibration Comfort and Vibration Energy Distribution in the Child Restraint System-Base Configuration.

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Title: Analysis of Vibration Comfort and Vibration Energy Distribution in the Child Restraint System-Base Configuration.
Authors: Frej, Damian1 (AUTHOR)
Source: Energies (19961073). Oct2025, Vol. 18 Issue 19, p5309. 38p.
Subjects: Child restraint systems in automobiles, Mechanical vibration research, Seating (Furniture), Sustainable transportation, Vibration measurements
Abstract: This study presents the results of an experimental evaluation of ride comfort for children transported in child restraint systems (CRS) during passages over speed bumps, with particular emphasis on the energy contained in vibrations. The tests were carried out under real operating conditions using two vehicles with different suspension characteristics and three loading levels corresponding to different stages of child development. Vertical accelerations were recorded at key points of the vehicle–seat system and subsequently analyzed in accordance with ISO 2631-1. Based on the vibration signals, root mean square acceleration (RMS), vibration dose value (VDV), seat effective amplitude transmissibility (SEAT), and root mean quad (RMQ) indices were calculated, enabling not only the assessment of discomfort levels but also the estimation of mechanical energy transmitted through the seat structure. The results showed that, depending on the type of vehicle, bump geometry, and load mass, the vibration energy can be significant and, in many cases, corresponds to levels classified as "severe" or "extreme discomfort." At the same time, this energy constitutes a potential power source for low-power sensors in "smart seat" systems, such as those monitoring the child's posture or environmental conditions. The findings highlight the need to consider vibration comfort criteria and the potential for vibration energy harvesting in the design and homologation of CRS, which aligns with the concept of sustainable transport and the development of energy self-sufficient technologies. [ABSTRACT FROM AUTHOR]
Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="DE" term="%22Child+restraint+systems+in+automobiles%22">Child restraint systems in automobiles</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+vibration+research%22">Mechanical vibration research</searchLink><br /><searchLink fieldCode="DE" term="%22Seating+%28Furniture%29%22">Seating (Furniture)</searchLink><br /><searchLink fieldCode="DE" term="%22Sustainable+transportation%22">Sustainable transportation</searchLink><br /><searchLink fieldCode="DE" term="%22Vibration+measurements%22">Vibration measurements</searchLink>
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  Data: This study presents the results of an experimental evaluation of ride comfort for children transported in child restraint systems (CRS) during passages over speed bumps, with particular emphasis on the energy contained in vibrations. The tests were carried out under real operating conditions using two vehicles with different suspension characteristics and three loading levels corresponding to different stages of child development. Vertical accelerations were recorded at key points of the vehicle–seat system and subsequently analyzed in accordance with ISO 2631-1. Based on the vibration signals, root mean square acceleration (RMS), vibration dose value (VDV), seat effective amplitude transmissibility (SEAT), and root mean quad (RMQ) indices were calculated, enabling not only the assessment of discomfort levels but also the estimation of mechanical energy transmitted through the seat structure. The results showed that, depending on the type of vehicle, bump geometry, and load mass, the vibration energy can be significant and, in many cases, corresponds to levels classified as "severe" or "extreme discomfort." At the same time, this energy constitutes a potential power source for low-power sensors in "smart seat" systems, such as those monitoring the child's posture or environmental conditions. The findings highlight the need to consider vibration comfort criteria and the potential for vibration energy harvesting in the design and homologation of CRS, which aligns with the concept of sustainable transport and the development of energy self-sufficient technologies. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/en18195309
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      – Code: eng
        Text: English
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        PageCount: 38
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      – SubjectFull: Child restraint systems in automobiles
        Type: general
      – SubjectFull: Mechanical vibration research
        Type: general
      – SubjectFull: Seating (Furniture)
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      – SubjectFull: Sustainable transportation
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      – SubjectFull: Vibration measurements
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              M: 10
              Text: Oct2025
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