Laboratory studies of the influence of the working position of the passenger vehicle air suspension on the vibration comfort of children transported in the child restraint system

Abstract The article presents the results of laboratory tests on the influence of the choice of the vehicle suspension position and the method of mounting child seats on the vibration comfort of children transported in them. Two child seats were used in the work. The B seat was attached to the vehicle with the ISOfix system, while the A seat was attached in the classic way (with seat belts). During the tests, the values of vertical vibrations were recorded on the seats of child seats, the rear seat of the vehicle and on the basis of ISOfix. The analyzed systems, depending on the method of mounting a child seat, may be characterized by two different vibration transmission chains. They depend on the method of fixing the child seat (the classic way of fixing the seat and the ISOFIX system). The article presents the results of empirical tests carried out at the EUSAMA SA.640 stand, which in these tests acted as a vibration generator with a frequency of 0 to 25 Hz. The analysis of the obtained results confirmed the observations published in previous articles about the negative impact of the use of the ISOfix base on the vibrational comfort of children.

Download Full-text

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

Sensors ◽

10.3390/s21248230 ◽

2021 ◽

Vol 21 (24) ◽

pp. 8230

Author(s):

Andrzej Zuska ◽

Damian Frej ◽

Jerzy Jackowski ◽

Marcin Żmuda

Keyword(s):

Negative Impact ◽

Rear Seat ◽

Test Apparatus ◽

Seat Belts ◽

Passenger Vehicle ◽

Vertical Accelerations ◽

Vertical Vibrations ◽

The Time Domain ◽

The Impact ◽

Vehicle Seat

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.

Download Full-text

Laboratory Tests of the Control of the Child Seats using Method for the Vibration Comfort of Children Transported in Them

Communications - Scientific letters of the University of Zilina ◽

10.26552/com.c.2021.3.b187-b199 ◽

2021 ◽

Vol 23 (3) ◽

pp. B187-B199

Author(s):

Damian Frej ◽

Andrzej Zuska ◽

Emilia Szumska

Keyword(s):

Root Mean Square ◽

Laboratory Tests ◽

Negative Impact ◽

Rear Seat ◽

Mean Square ◽

Seat Belts ◽

Laboratory Studies ◽

Car Seat ◽

Vertical Vibrations ◽

The Impact

The article presents results of the laboratory studies of the impact of the child seats mounting method on the vibration comfort of children transported in them. The tested child seats were mounted forward facing the rear seat of a passenger car. The A seat was fastened with the ISOFIX base, while the B seat was fastened with standard car seat belts. During the tests, values of the vertical vibrations were measured on the seat of the child seat, the rear seat of the vehicle and the ISOFIX base. It was noted that the analyzed system, may be characterized by two different vibration transmission chains, which depend on the child seat mounting system (classic seat mounting system and ISOFIX system). These studies show the negative impact of using the ISOFIX base, which is confirmed by the Root Mean Square (RMS) values and the Vibration Dose Value (VDV), determined for the "A" seat secured with the ISOFIX base that were higher than the RMS and VDV for the "B" classic mounted seat.

Download Full-text

Road vehicles. Test procedures for evaluating child restraint system interactions with deploying air bags

10.3403/30288450u ◽

2015 ◽

Keyword(s):

Restraint System ◽

Road Vehicles ◽

Test Procedures ◽

Air Bags ◽

Child Restraint ◽

Child Restraint System

Download Full-text

Rideshare use among parents and their children

Injury Epidemiology ◽

10.1186/s40621-021-00302-4 ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Johnathon P. Ehsani ◽

Jeffrey P. Michael ◽

Andrea Gielen

Keyword(s):

Motor Vehicle ◽

College Education ◽

Total Sample ◽

Legal Guardian ◽

Number Of Children ◽

Risk Of Injury ◽

Restraint Use ◽

Child Restraint ◽

Nationally Representative ◽

Child Restraint System

AbstractMotor vehicle crashes are the leading cause of death for young children. Millions of ridesharing trips are taken each day, and use of these services is predicted to increase. Therefore, it is important to examine the safety of children in these vehicles. We conducted a survey of a nationally representative sample of U.S. adults aged 18 years or older (N = 2017). Of the total sample, 450 respondents reported being a parent or legal guardian of children below the age of 10. Of these, 307 or 68% had ever used ridesharing. Among those who had used ridesharing, a total of 253 or 82% reported using ridesharing with their children below the age of 10 years. Among this group, rideshare use was significantly higher among individuals with college education, and in higher income households. Given that the majority of U.S. states have legislation exempting rideshare vehicles from child restraint system law coverage, our finding of high rates of rideshare use among parents suggests that a large number of children could be at risk of injury due to a lack of appropriate restraint use.

Download Full-text

The Design of Child Restraint System (CRS) Labels and Warnings Affects Overall CRS Usability

Traffic Injury Prevention ◽

10.1080/15389580490269074 ◽

2004 ◽

Vol 5 (1) ◽

pp. 8-17 ◽

Cited By ~ 15

Author(s):

CHRISTINA M. RUDIN-BROWN ◽

MIKE P. GREENLEY ◽

ANDREA BARONE ◽

JOE ARMSTRONG ◽

ALICE F. SALWAY ◽

...

Keyword(s):

Restraint System ◽

Child Restraint ◽

Child Restraint System

Download Full-text

Pulse Sensitivity of a Child Restraint System, Near-Side Impact Fixture

10.4271/2014-01-0538 ◽

2014 ◽

Author(s):

Janet Brelin-Fornari ◽

Sheryl Janca

Keyword(s):

Side Impact ◽

Restraint System ◽

Child Restraint ◽

Child Restraint System

Download Full-text

Assessment of Phytotoxic Potential of Potato Genotypes

Plant Breeding and Seed Science ◽

10.1515/plass-2017-0004 ◽

2017 ◽

Vol 75 (1) ◽

pp. 17-22

Author(s):

Dorota Sołtys-Kalina

Keyword(s):

Correlation Coefficient ◽

Negative Impact ◽

Biologically Active ◽

Test Plant ◽

Laboratory Studies ◽

Leaf Extracts ◽

Potato Leaf ◽

Active Compounds ◽

Step Procedure ◽

Total Glycoalkaloids

Abstract In the laboratory studies on allelopathy, phytotoxicity is defined as a negative impact of plant’s extracts or natural compounds derived from plants, on germination and/or growth of the tested (acceptor) plant. Glycoalkaloids are the main biologically active compounds of the potato and are involved in potato phytotoxicity (the correlation coefficient of the length of the test plant with the concentration of total glycoalkaloids present in the leaf extracts of forty potato genotypes was r = -0.41). The assessment of phytotoxic abilities of the potato is a two-step procedure which consists of determining glycoalkaloids in potato leaf extracts and analyzing the root and hypocotyl lengths of the test plant growing in potato leaf extracts.

Download Full-text