The air pressure controlled hydraulic telescopic shock absorber of axles air suspension is capable of changing its damping force in dependence on air pressure in air springs. Air pressure in springs rises as vehicle loading grows and damping forces in the shock absorbers increase. When reducing vehicle loading, air pressure in springs drops and causes decrease in damping forces in the shock absorbers. Thus the vehicle keeps the constant driving stability and comfort in various operational situations. This performance of the controlled shock absorber can be able use of at all vehicles that use the axles air suspensions. Due to the possibility of improving dynamic properties of those types of vehicles BRANO Inc., the producer of shock absorbers, started to develop air pressure controlled hydraulic telescopic shock absorbers of axles air suspensions. The SOR C 12 intercity bus is the reference vehicle, for which research and development of controlled shock absorbers is done and on which the shock absorbers are verified. Force-velocity characteristics of the controlled shock absorbers of axles air suspension were designed on the basis of results of computer simulations with the bus multibody models created in the alaska simulation toolbox. Multibody models of an empty vehicle, a fully loaded vehicle and four variants of partly loaded vehicle were created. For each weight of the bus three multibody models of various level of complexity were created. Since the bus multibody models should be used especially for designing force-velocity characteristics of air pressure controlled shock absorbers, great attention was paid to the correct interpretation of real behavior of hydraulic shock absorbers and air springs of axles suspension. As a criterion for the design of the optimum forcevelocity characteristics of shock absorbers, maximum similarity of dynamic responses of multibody models of the bus of all the considered weights to dynamic response of multibody model of the bus with the same loading as during the experimental measurements with the real vehicle (approx. 71.5 % of the maximum permissible weight), was chosen. In the course of measurements the shock absorbers characteristics were optimally tuned for this vehicle weight. Time histories of relative deflections of axles air springs determined during the simulations of the vehicle run over the modified standardized obstacle were compared. Approach based on the evaluation of the correlation coefficient of two time series was used for the evaluation of accordance of dynamic responses. Then, the suitability of the designed characteristics of the controlled shock absorbers was verified from the point of view of improving the horizontal dynamic behavior of the vehicle during the simulations.
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- Design of Characteristics of Air Pressure Controlled Hydraulic Shock Absorbers in an Intercity Bus
- Springer Netherlands
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