Air spring systems are gaining more popularity in the automotive industry and with the ever growing demand for comfort these-days they are almost inevitable. Some significant advantages which they offer over conventional steel springs are appealing to commercial vehicles as well as to modern passenger vehicles in the luxury class. Current production air spring systems exist in combination with hydraulic shock absorbers (integrated or resolved). An alternative is to use the medium air not only as a spring but also as a damper: a so-called air spring damper. Air spring dampers are force elements which could be a great step forward in chassis technology due to their functionality (frequency selectivity, load levelling, load independent vibration behaviour, load dependent damping). By the use of rubber bellows instead of dynamic seals, they contribute to a better ride comfort. Compared to other conventional suspension systems, the air spring damper which shows promising characteristics presents some disadvantages: The low damping capacity at small excitation amplitude and the dissipated energy at high dynamic excitation amplitude with high environment temperature, leads to higher temperatures in system. This paper deals with modelling and the development of an air spring damper (LFD from its German name Luftfederdämpfer) of new generation, with regard to ride comfort and handling. First of all as motivation, a comparison is made between the current production air spring damper with integrated shock absorber and an existing air spring damper component. Then it presents the basic working properties of the LFD, summarizes the state of the art of simulation models for air spring damper and gives some insight into the physics of such systems and their sensitivity to some parameters. Finally redesign and optimise for a better ride comfort and handling.
Air spring damper, on the way to exceptional sliding: modeling, development and optimization of an air spring damper with regard to ride comfort and handling
2014
30 Seiten, Bilder, Tabellen, 10 Quellen
Aufsatz (Konferenz)
Englisch
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