科研之友
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摘要
Trunk transportation and terminal distribution are two important parts of express delivery in China. Heavy truck and medium truck are two main vehicles of trunk transportation. Mini van and two-wheel electric bicycle are widely used for terminal distribution. Four vehicles mentioned previously and a sedan car were chosen for vibration level measurement and analysis in this paper. The results revealed that vibration levels were significantly higher in the vertical axis, and decreased with the increase of payload, and increased with the increase of speed again. Similar power spectral density peak frequencies were found in a comparison study with previous results in the low-frequency region (1-10Hz), occurred at approximately 2 Hz in the van and sedan car and at 3 to 4 Hz in the truck and at 4 to 5 Hz in the two-wheel electric bicycle. Except the two-wheel electric bicycle, the second peak frequency occurred at approximately 20 to 30 Hz in the sedan car and at 10 to 20 Hz in the mini van and at 20 to 40 Hz in the heavy truck, which were also similar to the previous studies. Vibration levels of the sedan car were the lowest, and the trunk transportation vehicles (heavy truck, medium truck) were the highest. The terminal distribution vehicles (mini van, two-wheel electric bicycle) were somewhere in the middle.
