Improving the damping of vehicle vibration by improving pneumatic springs

Vyacheslav Masliyev,Alexander Demydov,Yurii Makarenko,Anton Masliev,Vitalii Yepifanov,Vladislav Dushchenko,Roman Nanivskyi,Yurii Cherevko

doi:10.15587/1729-4061.2022.253561

Abstract

It is known that the air suspension of vehicles, in which diaphragm-type air springs are used as an elastic element, do not provide the necessary vibration damping. The reason for this is that such air springs have a relatively large passive part. As a result, a relatively small mass of compressed air crosses through the throttle installed between the air spring and the additional reservoir. This mass of air contains thermal energy, into which the energy of vibrations, which enters through the walls of the additional reservoir into the environment, has turned. This is interpreted as vibration damping, which is insufficient due to the low air mass. Therefore, hydraulic vibration dampers are installed parallel to the diaphragm air springs, which complicates and increases the cost of the vehicle. Increasing the damping properties of such air suspensions could eliminate these hydraulic vibration dampers, which would reduce costs and simplify operation. An air suspension with an improved air spring has been proposed, which has an increased effective area and a reduced "passive" capacity, an empirical formula has been built to determine its damping coefficient, as well as an expression for the stiffness coefficient. Mathematical modeling of oscillations of vehicles with different designs of pneumatic springs was carried out in order to improve their damping. The mathematical model takes into account the change in the parameters of the air spring during vibrations. The study was carried out for the diesel train DL-02. Using mathematical modeling, the effectiveness of the air suspension with an improved air spring has been proven: its damping index reaches 0.263, and the vibration damping coefficient is 45,859 kg/s, which corresponds to the values recommended for vehicles.

Highlights

Oscillations and vibrational accelerations of vehicles during movement create the problem of providing comfortable conditions for passengers and saving the path from damage.Specialists solve this problem by optimizing the charac teristics of suspensions, as well as creating fundamentally new designs.One of the most common ways to solve this problem is the use of suspensions based on pneumatic springs (PS) on vehicles
A hypothesis has been put forward that it is possible to increase the damping of the air suspension by increasing the amount of compressed air flowing through the throttle between the pneumatic spring and the additional reservoir
When PS is compressed, this provides an increase in the effective area and, the mass of air that will flow through the throttle into the additional reservoir

Summary

Introduction

Oscillations and vibrational accelerations of vehicles during movement create the problem of providing comfortable conditions for passengers and saving the path (path) from damage. Specialists solve this problem by optimizing the charac teristics of suspensions, as well as creating fundamentally new designs. One of the most common ways to solve this problem is the use of suspensions based on pneumatic springs (PS) on vehicles This allows to implement in these dimensions much more metal springs of its static deflection, that is, to implement a «soft» suspension. Research on improving the damping of vehicle vibrations by improving pneumatic springs is relevant

Literature review and problem statement

The aim and objectives of research

Materials and methods of research

Findings

Conclusions