The paper give a summary of the investigation of dynamics and reliability of rubber segments for resilent wheel. Experimental research of static and dynamic material characteristics has run over plus and minus temperature ranges. The fatigue tests at pressure loadings that lead to curves of lifetime evaluation have been performed. The evaluation of friction force dependences on amplitudes and adherence pressure sizes have been elaborated. As the first approximation of damage assessment of rubber segments Palmgren-Miner hypotheses of cumulative damage from the closed cycles of service loading were used. The quantitative information presented here is not solid but conventional, since the critical material values for fatigue analysis are not measurable for rubber. They were estimated as limit values with respect to the reliability criteria proposed for the compliant component of the wheel. The model of a damage and permanent deformation evolution at dynamic long-term loading has not been fully analytically described due to time variant behaviour of rubber by now. It is evident from our experimental research that for analyzed isoprene rubber a lifetime increases with an increase of mounting prestress by plus temperatures and that it decreases by minus temperatures. The stiffness grows and the amplitude of deformation falls down from the operation force loading both due to minus temperatures and prestress increase. We consider desirable a for lifetime optimalization to complete achieved lifetime curves also for higher values of prestress and for modified reliability criterion to 10% of a permanent deformation evaluated after a recovery period. Furthermore, the number of test cycles should be raised up to 107 at least. Repeated operational measurements with suppressing of spurious influences, especially electrical, to get a more accurate damage assessment and a direct measurement of deformations on the rubber segment are advisable, too. The vibrodiagnostic system VDS-UT2 with a remote communication via Internet connection for a longterm monitoring of vibration and static and dynamic deformations of railway wheels under operation has been designed and developed during this project. The deformation sensor Extensometer UT2 with telemetric transfer having double frequency modulation features an accuracy of app. 0.03 mm was implemented into the system. The contactless sensor solution for time and amplitude difference measurement by impulse method based on magnetic field changes is aimed at long-term rubber segment deformation measurement.


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    Title :

    Investigation of dynamics and reliability of rubber segments for resilent wheel


    Contributors:
    Pesek, L. (author) / Pust, L. (author) / Balda, M. (author) / Vanek, F. (author) / Svoboda, J. (author) / Prochazka, P. (author) / Marvalova, B. (author)


    Publication date :

    2008


    Size :

    15 Seiten, 16 Bilder, 17 Quellen



    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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