Research and Analysis of the Propagation of Vertical Vibrations in the Arrangement of a Vehicle Seat—A Child’s Seat

Abstract

This paper deals with the issues of the impact of vertical vibrations on a child seated in a child seat during a journey. Its purpose was to assess the impact of fastening the child seats and road conditions on the level of vibrations recorded on child seats. The paper describes the tested child seats, the methodology of the tests and the test apparatus included in the measuring track. The tests were carried out in real road conditions where the child seats were located on the rear seat of a passenger vehicle. One was attached with standard seat belts, and the other with the ISOFIX base. When driving on roads with three types of surface, the following vertical accelerations were measured: seat of the child seats, the rear seat of the vehicle and the ISOfix base. The recorded accelerations were first analyzed in the time domain and then in the frequency domain. Three indexes (r.m.s, rmq and VDV) were used to assess the vibration comfort. Research has shown that the classic method of fastening a child seat with standard seat belts is more advantageous in terms of vibration comfort. Calculated indicators confirmed the negative impact of separating the child seat from the rear seat of the vehicle using the IQ ISOFIX base.

Impact of Consumer Value on the Selection of a Safe Child Seat

“…After the three-point seat belts were patented, they began to be installed en masse, which also made them mandatory equipment in every vehicle. After about a decade, they were also fitted to vehicle seats [4][5][6].…”

“…would sit. Of course, there was no mention of seat belts yet, and the "seat" itself still did not increase safety while driving [2,[4][5].…”

Influence of Changes in Stiffness and Damping of Tyre Wheels on the Outcome of the Condition Assessment of Motor Vehicle Shock Absorbers

“…The reduction in radial stiffness also reduces the vertical accelerations generated by the unevenness of the road surface. Reducing these accelerations has the beneficial effect of increasing the vibration comfort of the car's occupants [42][43][44].…”

Analysis of the selection of a child seat

“…Among them, however, there are gross errors of adults: permission to ride with or without seat belts fastened loosely, in an unsuitable vehicle seat or without it, or in a booster seat that does not provide any protection in a collision or accident. Therefore, in order to give the child maximum safety, it should be transported in a properly selected child seat in terms of the child's age and body structure [19]. In addition, it should be noted that the safest way to install a child seat in a passenger vehicle is to install the seat rear-facing (RWF seat).…”