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http://dx.doi.org/10.5050/KSNVN.2005.15.1.020

Study on Uncertainty Factors of Head Vibration Measurements  

Cheung, Wan-Sup (Acoustics and Vibration Group/KRISS)
Kim, Young-Tae (Acoustus Vibration Group/KRISS)
Ryu, Je-Dam (Acoustus Vibration Group/KRISS)
Hong, Dong-Pyo (Chon-Buk National University)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.15, no.1, 2005 , pp. 20-28 More about this Journal
Abstract
This paper addresses uncertainty issues encountered recently in measuring head vibration using the conventional 6-axis or 9-axis bite-bar model. Those conventional bite-bar models are shown to present insufficient information to evaluate a generalized motion of head vibration. In order to overcome such limit, a new theoretical measurement model that consists of four 3-axis linear accelerometers is suggested. It is shown to enable the measurement of three angular acceleration components and six second-order angular velocity-dependent terms. Those nine angular motion-related ones, in addition to the three linear acceleration terms at the origin, are found to make it possible to evaluate the generalized head vibration for a given position. To examine the feasibility of the proposed method, a newly designed 12-axis bite-bar was developed. Detailed experimental results obtained from the developed 12-axis bite-bar are demonstrated in this paper. They illustrate that the popular 6-axis bite-bar model yield about $4.0\%$ relative measurement uncertainty for the pitch component of head vibration, $14\%$ and $10\%$ relative measurement uncertainty for the roll and yaw components of head vibration, respectively. Furthermore, this paper proposes other uncertainty factors to be considered in the future.
Keywords
Head Vibration; Bite-bar; Human Vibration; Uncertainty Factor;
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