Comparison of 12 axes vibration data on the different kinds of vehicle seats according to the

In 1997, ISO2631-1 (Evaluation of human exposure to whole body vibration- General requirement) was published. At ISO2631-1, the common indicator for evaluating the health, discomfort, perception, and motion sickness about whole body vibration is defined, and it is decided by evaluation of the discomfort when the human is taking-a-seat posture that vibrating 12-axis included in the human body of the supporting seat surface, the seat-back and the feet is measured simultaneously. 6-axis (3-axis vibration: x, y and z, and 3-axis rotational vibration: roll, pitch, yaw) in the supporting seat surface did not correspond to 3-axis seat pickup defined by ISO5008, and did not have the way measured actually. Moreover, there were also no measuring instruments, which can carry out simultaneous measurement of the 12-axis based on ISO-2631-1 standard. Therefore, there are very few studies investigating 12 axes vibration data on the different kinds of vehicle seats according to the ISO 2631-1 standard for evaluating perception or discomfort of multi-axis vibration. The growing importance of detrimental vibrations on mobile machinery, magnified by increasing working speed, emphasizes the need to evolve from static to dynamic design of mechanical systems. Data on which to base developments of standard multi-axis prediction techniques for discomfort were therefore limited. There were no special equipments as a commercial base to measure 12 axes vibration on the vehicle seats in the world. Therefore, in order to solve this problem, 6-axis seat pickup was developed. The 12-axis vibration measurement on the seat was realizable with this 6-axis seat pickup. In this research, the 12-axis vibration measurements in actual operating conditions were performed for various vehicle seats and compared