Methods to Assess Jolting and Jarring Events: A Surface Mining Case Study to Evaluate the Jolt-Duration Method

When operating a piece of heavy equipment, the equipment operator is exposed to Whole Body Vibration (WBV), with peaks in the acceleration called jolting and jarring. Various published consensus standards exist to analyze overall WBV, but a consensus standard does not exist for describing, detecting, and categorizing the jolting and jarring peaks. During previous research into methods of measuring jolting and jarring, a Root Mean Square (RMS) method was implemented and deployed in jolting and jarring event meters called Shox Boxes (invented by the National Institute for Occupational Safety and Health, NIOSH). The RMS assessment was difficult for end users of the Shox Boxes to utilize for describing and categorizing the peaks. This paper offers a hypothetical standard, the Jolt-Duration (JD) method, based on the simple amplitude and duration of the peaks, as well as the time between peaks. RMS methods, this JD method, and the classic Dynamic Response Index (DRI) method were tested and compared, utilizing data from a surface mining study and a NIOSH software program called Vibration and Acceleration Statistical Analysis (VASA).

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See papers presented at SAE 2009 Commercial Vehicle Engineering Congress & Exhibition, October 2009, Rosemont, IL, USA, Session: Indirect Viewing and Enhanced Rear Signaling Session

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