This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Occupant Vibrations - A Challenge for Seat Development
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 05, 2016 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Predicting the vibration comfort is a difficult challenge in seat design. There is a broad range of requirements as the load cases strongly vary, representing different excitation levels, e.g. cobblestones or California roads. Another demand is the driver expectation, which is different for a pickup and a sports car. There are several approaches for assessing the vibrations of occupants while driving. One approach is the evaluation of comfort by integral quantities like the SEAT value, taking into account a weighting based on the human body sensitivity. Another approach is the dimension of perception developed by BMW, which is similar to psychoacoustics as the frequency range is separated with respect to occurring vibration phenomena.
The seat transmissibility is in the focus of all activities. In the frequency range it defines the relation between the input at the seat slides and the output at the interface of human body and trim. The seat transmissibility represents only the occupied seat behavior, describing the reduction or decrease of vibrations applied on the seat slide. For its computation, the interaction of all model parts, i.e. the human body, the foam pads and the seat structure have to be considered. Simplified setups, such as using a rigid mass as an occupant, enable only evaluations with limited information to optimize the dynamic seating comfort.
The paper shows the theory behind seat dynamics, describe the influence of the main parts, i.e. occupant, foam and structure, on the seat transmissibility and will finally give an overview on current approaches for the assessment.
CitationSiefert, A., "Occupant Vibrations - A Challenge for Seat Development," SAE Technical Paper 2016-01-1432, 2016, https://doi.org/10.4271/2016-01-1432.
Data Sets - Support Documents
|Unnamed Dataset 1|
- ISO 3386-1 Polymeric materials, cellular flexible --Determination of stress-strain characteristics in compression --Part 1: Low-density materials 1986
- Griffin , M.J. Handbook of Human Vibration Elsevier 1996
- Siefert , A. , Pankoke , S. , and Hofmann , J. CASIMIR/ Automotive: A Software for the virtual Assessment of Static and Dynamic Seating Comfort SAE Technical Paper 2009-01-2311 2009 10.4271/2009-01-2311
- ISO 2631-1 Mechanical vibration and shock -- Evaluation of human exposure to whole-body vibration -- Part 1: General requirements 1997
- VDI 2057-1 Einfluss der Frequenzbewertung nach VDI 2057-1:2002 auf die Größe der Ganzkörper-Schwingungsbelastung VDI 2002
- Lennert , S. Zur Objektivierung von Schwingungskomfort in Personenkraftwagen: Untersuchung der Wahrnehmungs-dimensionen VDI Science Report 689 2009