Power Spectrum Density, PSD, which is delivered from actual transport vibration data is recommended to be applied for the random vibration test according to JIS Z 0232:2020 Package-Complete, filled transport packages and unit loads-method of vibration test. Consequently, in our previous study, we proposed a new calculation method for PSD. This method utilizes multiple sets of actual vibration data which have already been collected from truck and railway transport. The aim of this method is to generate PSD from actual vibration data for random vibration test, even in the absence of actual truck or railway vibration data. However, this method couldn’t calculate PSD for a composite system of truck and railway. In this paper, a new calculation method of PSD that combines the characteristics of actual vibration data between truck and railway is considered to apply using tailoring method with customization.

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