By Y. C. Fung (auth.), Alan M. Nahum, John W. Melvin (eds.)
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Extra info for Accidental Injury: Biomechanics and Prevention
Stepping the motor through a series of known angular velocities provides a series of known accelerations and measurable outputs. It is from this information that a calibration is obtained. Because the measurements are made under steady-state conditions, this form of calibration is static in nature, as is dead-weight calibration of a load cell. 11. Rate table: A static (constant centripetal acceleration) calibration fixture for accelerometers. The rotating accelerometer mounting platter is driven by an AC servomotor.
Once known values have been applied and output voltages have been measured, a linear regression between input and output may be found. Then the voltage obtained from a resistor shunt may be used to predict a physical value from the calibration curve. This physical value is then intimately associated with the transducer network being calibrated and shunt resistor being used and is independent of gain. Shunt calibration is typically a bipolar operation, with the resistor being shunted over upper and lower adjacent arms of the bridge, producing a positive and negative shunt voltage.
FIGURE determination of the generalized motion and contact forces experienced by the impacted Hybrid III head. Bendjellal et al. 24 employ the MS-I mount (Fig. 24a) for cadaver testing and the 18channel APR 89-III (Fig. 24b) for dummy testing. The APR 89-111 consists of six triaxial clusters, and is capable of 3-2-2-2, 3-3-3, or in-line measurement techniques, and provides a means of direct comparison between these methods. Spherical geometric analysis (SGA) is applied to a noncollinear accelerometer array using centripetal accelerations (normal) to calculate angular velocity directly by Nusholtz et al.