Three-axis simultaneous vibration testing can replicate real-world vibration more accurately than single-axis vibration testing. On the other hand, three-axis simultaneous vibration testing requires consideration of its unique characteristic such as a correlation between three axes, which does not need to be considered in single-axis vibration testing. Therefore, in order to develop a theory for performing three-axis simultaneous vibration testing, it is required to clarify a correlation between three axes during real transportation. This study aims to gain underlying knowledge for three-axis simultaneous vibration testing, and analyzes a correlation between vertical, lateral, and longitudinal acceleration measured on a truck bed (Maximum load capacity: 3550kg). From the results of correlation analysis, it was made clear that impulsive acceleration tended to be in sync between three axes in the range where a kurtosis value of vertical acceleration is high. The correlation gained from this study is expected to be utilized as underlying data for developing a three-axis simultaneous random vibration testing method.

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