It is difficult to obtain accurate measurements of the dynamic characteristics exhibited by automotive steering columns. The difficulties are due in-part to the use of lubricated contact bearings which support the column during testing. These bearings introduce damping, hysteresis, non-linear stiffness and clearance/preloaded constraints on the column. These error sources then mask the true dynamic behavior of the column, thereby preventing a better understanding of the relationship between column design, manufacturing tolerances and column vibration. With this paper, the authors introduce the concept of a revolute compliant mechanism that can be used in place of contact bearings to support steering columns during dynamic tests. These mechanisms do not exhibit the non-linear damping/stiffness and non-repeatable errors found in contact bearings. As a result, they can be used to design equipment that is capable of taking test data which matches theoretical predictions to within 2%. Experimental results obtained with this equipment suggest (more study is needed to confirm this) that manufacturing errors may be responsible for up to 20-30% error in predicting vibration amplitudes of components within the column, but only 2% error in predicting steering wheel vibration amplitude. Understanding this tolerance-response relationship (via this test equipment) is a necessary first step in understanding and eliminating steering wheel nibble vibrations. The degree to which the non-linearity affects the steering column natural frequency depends on the magnitude of the excitation amplitude and the magnitude of the clearance. Continued efforts are underway to develop models which are (1) more accurate in predicting the non-linear effects and (2) better link model predictions to tolerances/clearances. The improved accuracy is necessary to future efforts that seek to solve the nibble problem by integrating damped compliant mechanisms within the steering column.


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    Titel :

    Design of a compliant revolute mechanism for accurate dynamic characterization of automotive steering columns


    Weitere Titelangaben:

    Entwurf eines nachgiebigen Drehmechanismus für die genaue Chakterisierung von Fahrzeuglenksäulen


    Beteiligte:


    Erscheinungsdatum :

    2004


    Format / Umfang :

    5 Seiten, 8 Bilder, 1 Tabelle, 12 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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