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Dynamic Calibration 4 ,8,9 Because piezoelectric transducers do not respond to steady-state excitation, static calibration is not possible. This means that piezoelectrics cannot be calibrated using constant levels or steps of input. It also means that a calibration value cannot be simulated in a static fashion, such as shunt calibration. Therefore piezoelectric transducers must be calibrated using a transient or time variant (dynamic) physical input. A common type of calibration is drop calibration.

22. Conceptual illustration of the WSU 3-2-2-2 showing the linear accelerometer positions and orientations. 39 2. Instrumentation in Experimental Design Therefore, angular accelerations are essentially found by averaging differences of linear accelerations measured at points at a given separation. This concept is extended by Chou et al. g. of an impacted head, to facilitate the calculation of head injury criterion (HIC). This corresponds to substituting measured and calculated values back into the original equations to find the linear accelerations at a point with known coordinates on the rigid body.

One of the most important concepts associated with digitizing is aliasing. Aliasing is the misrepresentation of a waveform. The Nyquist Criterion states that for accurate representation of a waveform, it must be sampled at a rate at least twice that of its highest frequency content. This is a minimal requirement. Because filters do not possess ideal cutoff characteristics and common waveform reconstruction methods are simplistic, practical sampling ratios are usually many times that of the waveform's highest-frequency component.

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