Abstract
Experimental laboratory research of human behavior under random two-axis vibration was performed on multi axes vibration simulator. Seven male subjects in driving condition were exposed to broadband two axis random vibration. Previously performed road experiment enable to determine dominant ride loading of passengers. Therefore, dominant excitation directions were in fore and aft and vertical direction of subjects. Influences of backrest angle and excitation amplitude on seat-to-head transmissibility were investigated. Some of obtained results will be presented here. Non-linearity of seat-human system was confirmed. Results presented here were base for parameter identification of biodynamic human model in further research.