Abstract
The publication addresses the need for technical solutions to reduce the transmission of lateral vibrations to passengers, especially children traveling by car in a child seat. A special design of a pendulum type tilting child seat has been proposed. Results of road trial conducted on a specific mountain road section are shown. The differences in the values of lateral accelerations acting on a child traveling in a conventional and in a tilting seat are given. The power spectral densities of lateral accelerations for both types of child seats are presented and compared. The root mean square values of lateral acceleration are given. Results for the values of the seat tilt angle are presented.
Highlights
When vehicles move, accelerations occur and aggravate the comfort of passengers
The results suggest that the maximum accelerations of the tilting seat are lower than the ones of the conventional seat
It is noted that special solutions to reduce lateral accelerations that occur in a cornering vehicle are currently not used
Summary
Accelerations occur and aggravate the comfort of passengers. The efforts to improve the comfort in vehicles so far are directed mainly towards reducing the amplitude of vertical oscillations by elastic suspension. The characteristics of suspension elements are selected so as to obtain a significant reduction in the amplitude of vertical oscillations in the frequency range 0 to 1 Hz, and from 2 to 20 Hz and above This is achieved by setting the natural frequencies of the vehicle body in the range 1-2 Hz. Longitudinal accelerations depend mainly on acceleration and deceleration of the vehicle and do not change frequently when traveling. When vehicles move in a turn, lateral accelerations act on passengers Their values depend on the curve radius and the vehicle speed. On a mountain road with successive curves this gives rise to a vibrational process in the lateral direction with a frequency depending on the turning radius, length, direction, spacing and speed of the car. On roads with many turns this vibrational process usually is in the frequency domain between 0,1 and 1 Hz and can cause discomfort and motion sickness in passengers
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