Predicting the responses of the combined human body-seat structure to vibration excitation is still a challenging task. This is mainly due to the complex dynamics behaviour of the seated human body in response to the vibration. Nevertheless, several applications, such as optimizing the vehicle seat structure or reducing the transmission of the vibration to the seat occupant, do not necessarily require complex modelling of the human body. It is however essential to characterize and predict the critical frequencies and the corresponding vibration patterns of the combined seat with human occupant. This study aims to predict the resonant frequencies and corresponding vibration mode shapes of the vehicle seat with occupant from the unoccupied seat. An experiment is designed to measure the frequency responses, resonant frequencies, and corresponding mode shapes of a selected vehicle seat when mounted on the test rig. Seventeen young male volunteers have participated in the experiments. The results indicate that that the vehicle unoccupied seat have three similar main seatback lateral, seatback fore-aft, and seat twisting resonant frequencies below 80 Hz. Adding the human occupant to the seat gave the same three seatback lateral, seatback fore-aft, and seat twisting mode shapes but with different resonant frequencies from their corresponding unoccupied seat. The changes of the resonant frequencies from unoccupied seat to the occupied seat for the all seventeen volunteers were consistent in accordance to their weights. Seated human occupant is not adding any new resonant frequency or mode shapes to the seat. Similar changes of the resonant frequencies between the six volunteers for the three different seats allow us to predict the key attributes of the seat with occupant (occupied seat) modes from their corresponding unoccupied seat. Results from this study are expected to reduce the need for complex modeling of the human body in upfront analysis in design of vehicle seats.
Characterization of the automotive seat/human structural dynamics
2012
9 Seiten, 7 Bilder, 2 Tabellen, 15 Quellen
Aufsatz (Konferenz)
Englisch
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