On the influence of sorbents on the static stiffness of Air Springs

Author:

Breitenbach StephanORCID,Skoglund Marcel,Lillepärg Jelena,Emmler Thomas,Mantwill Frank

Abstract

AbstractAir Springs are deployed in many technical areas today. In the premium segment of the automotive industry in particular, they are being used more and more frequently. The load-independent spring rate results in a better ride comfort. Since the stiffness of the Air Spring is significantly influenced by the enclosed air volume, this usually leads to a conflict of objectives between the available installation space and the stiffness optimum. To reduce the spring stiffness while maintaining the same design space, Coackley and Elliot describe in their patent the use of adsorbents such as activated carbon in the enclosed air volume of the spring. By binding air molecules to the adsorbent, more air molecules fit into the enclosed Air Spring volume, while the size and pressure of the Air Spring remain the same.This paper describes how the so-called “virtual volume” is created by adsorption and how it can be determined by simplified measurements using a gas pycnometer. Furthermore, it is shown how these measurements are related to the static stiffness of an Air Spring, so that a prediction of the static stiffness of an Air Spring filled with sorbent, in this case activated carbon, is possible by simple pycnometric measurements.

Funder

Helmut-Schmidt-Universität Universität der Bundeswehr Hamburg

Publisher

Springer Science and Business Media LLC

Reference29 articles.

1. Coackley JF, Elliott AS (2011) Air spring, US009784330B2

2. Pahl HJ (2015) Air springs in commercial vehicles. Hans Joachim Pahl, Ronnenberg

3. Trelleborg-Vibracoustic (2015) Schwingungstechnik Im Automobil. Vogel Business Media GmbH & Co. K, Würzburg

4. Bedarff T Grundlagen der entwicklung und untersuchung einer aktiven luftfeder für personenkraftwagen. Dissertation, Technische Universität Darmstadt, Darmstadt (2016). http://wl.fst.tu-darmstadt.de/wl/Dissertationen/diss_160000_GrundlagenderEntwicklungundUntersuchungeineraktivenLuftfederf%C3%BCrPersonenkraftwagen_Bedarff.pdf. Accessed 8 Nov 2018

5. Breitenbach S, Mantwill F, Sagert A (2023) Dynamic system behaviour of adsorbent-filled air springs. Int J Automot Technol 2021(24):483–492. https://doi.org/10.1007/s12239-023-0040-7

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