Vibration field-to-lab: Impact of time measurement intervals on intensity

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Title: Vibration field-to-lab: Impact of time measurement intervals on intensity
Author: Magnifico, Frank Jr; Gerondale, Jay
Abstract: The objective of this study was to determine what impact various time measurement intervals would have on intensity levels in the trucking environment. The study was limited to timer triggered data collection associated with semi trailer vibration. The study then examined the relationship between established wake-up time intervals and the resultant intensities and PSD plots for the same field trip. In order to accomplish this, it was necessary to use multiple recorders. Each recorder was to be set with a specific time trigger threshold for recording data. Two vibration environments were analyzed using Saver vibration recording equipment. One environment was limited to short trips of less than four hours and the second test environment consisted of long trucking runs in excess of thirty hours. After a significant amount of data was collected, a statistical analysis was then completed to determine what the effects of varying the time intervals had on intensity. Several different elements of the data were discussed. Namely, they were standard deviation, ANOVA, percent difference, Field-to-Lab, and PSD comparisons. Each element provided more insight into the affect of varying the time trigger interval. If each element were isolated, arriving at a conclusion with a high level of confidence would be difficult. However, evaluating all the elements together point the data in a single direction and indicate that varying the time measurement interval does have an impact on the calculated intensity for Field-to-Lab vibration analysis.
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Date: 2000

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