The widespread use of tractor trailers for the shipment of packaged products has brought about the need to be able to quantify accurately the nature of the shipping environment as it pertains to damage. The purpose of this study was to compare the levels of lateral and longitudinal vibration to vertical levels measured in the same truck trailer travelling over the average USA highway. Four truck‐trailer shipments, two with light loads and two with heavy loads, were instrumented with accelerometers and recording equipment. From the data acquired, power spectral density plots were developed. The results showed that below 20 Hz, lateral and longitudinal vibration levels were generally much lower than vertical levels, but at frequencies above 20 Hz, all three were similar. The more heavily loaded trucks showed higher lateral and longitudinal levels of vibration than the lightly loaded ones.
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Singh et al. (1992) studied this question.