Car seats are at the heart of the development cycle of a new car model, as they have to comply with more and more demanding and often conflicting requirements, related to safety regulations, comfort, styling, weight and size reduction, platform standardization, durability, electronic equipments, handling and ergonomics. Taking all these requirements into account at a very early stage in the car design cycle is of major importance to avoid an iterative, time consuming, and costly trial-and-error process. Due to the complexity of the physical phenomena induced by the seating and riding process, advanced numerical models and techniques, such as those used for virtual crash tests, are needed for seat comfort simulations. In particular, the accurate deformation of seat foam, trim, suspension, and of human tissues and joints, have to be taken into account, along with contact friction, viscous effects, strain-rate dependency, and hysteresis losses. Recent advances in the field of human modelling, in particular, have enlarged the perspectives and opened a new way in the field of comfort design. The aim of the work described in this paper is to validate a predictive numerical tool, PAM Comfort, devoted to the virtual assessment of seat comfort parameters before any prototype is built. The first objective is to simulate some classical experimental processes, related to H-Point, softness, contact pressure, or vibration transmission, taking into account detailed seat characteristics. The second objective is to help improving the understanding of some discomfort feelings, by overcoming the limitations of experimental studies, and providing insight into non-measurable quantities, inside the seat and the human body. A H-Point simulation with a J826 dummy model was performed. The exact experimental process was simulated, with an acceptable computational time (less than 7 hours on a PC). The difference between simulated and experimental H-Point coordinates is 1 mm or less in each direction, which is close to the experimental scattering. A full, 50-th-percentile human model, with anatomically precise features and deformable spine and tissues, was used to compute the contact pressure distribution. The results compared quite well with the ones of volunteers tests, from a qualitative and quantitative point of view.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Virtual seat comfort assessment


    Weitere Titelangaben:

    Virtuelle Bestimmung des Sitzkomforts bei Fahrzeugsitzen


    Beteiligte:


    Erscheinungsdatum :

    2005


    Format / Umfang :

    12 Seiten, 16 Bilder, 2 Tabellen, 8 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Virtual seat comfort assessment

    Amann,C. / Klisch,T. / Huschenbeth,A. et al. | Kraftfahrwesen | 2005


    Virtual Seat Comfort Assessment

    Amann, C. / Klisch, T. / Huschenbeth, A. et al. | British Library Conference Proceedings | 2005


    Human body modeling for virtual seat comfort testing

    Choi,H.Y. / Sah,S. / Na,S. et al. | Kraftfahrwesen | 2006


    Seat Comfort

    Fukuda, H. | British Library Conference Proceedings | 1997


    Seat comfort

    Lee,J. / Ferraiuolo,P. / Ford Motor,US | Kraftfahrwesen | 1993