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.
Highlights
There are many design solutions for child seats on the market, which differ in terms of the fastening system, construction material and safety level, and selecting the ideal seat is a difficult task for buyers [9,10,11,12,13,14]
The results showed that the vibrations measured on the seat of the child seat turned out to be higher than the vibration level on the driver’s seat
Where: Table 3 presents the summary of the values of the determined indicators of the vibration comfort assessment rms, Vibration Dose Value (VDV) and rmq for the measurements carried out with the a (t)—vertical acceleration value, m/s2, recorded as a function of time t child seats loaded with a mass of 5 kg, 10 kg, and 15 kg
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The child seats available on the market have many technical solutions, the main purpose of which is to increase the safety level of children while traveling. Vehicle seats with sensors informing whether the child has properly fastened seat belts exists, as well as an ISOFIX base with a sensor that provides information about the correct fastening of the seat [50,51,52,53,54] It should be noted, that there are solutions for child seats, which are equipped with a temperature sensor and sensors that allow for blood pressure measurements [55,56,57,58,59,60], Equipping safety seats with various types of sensors increases ergonomic comfort and improves safety
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