Abstract
This paper describes the implementation of a new, fast and precise linear motor drive for PTB’s primary shock calibration device. This device is used for monopole shock calibrations of accelerometers using the “hammer-anvil” principle according to ISO 16063-13:2001 and operates in a peak acceleration range from 50 m/s² to 5000 m/s². <br />The main challenge of implementing this kind of shock generator is accelerating a hammer to velocities up to 5 m/s within distances of less than 70 mm. <br />In this paper, a few helpful improvements are described which lead to an enhanced repeatability of pulse generation over the full shock intensity range as well as a substantial decrease of harmonic disturbing signals.
Highlights
PTB’s original shock exciter which was designed for low to medium acceleration intensities mainly consists of a mechanical spring unit, an airborne transmission element and an air-borne measuring unit to which the accelerometer to be calibrated is attached
Using the spring drive unit, shock peak values can be varied between 100 m/s2 and 5000 m/s2, whereas the shock duration is between 8 ms and 1 ms
By definition [1], the shock sensitivity Ssh is calculated as the quotient of the output charge peak value of the accelerometer and the peak value of the interferential measured shock acceleration
Summary
PTB’s original shock exciter which was designed for low to medium acceleration intensities mainly consists of a mechanical spring unit, an airborne transmission element (the “hammer”) and an air-borne measuring unit (the “anvil”) to which the accelerometer to be calibrated is attached. Using the spring drive unit, shock peak values can be varied between 100 m/s2 and 5000 m/s2, whereas the shock duration is between 8 ms and 1 ms. Different sets of the modules (hammer, anvil and spring unit) are available, allowing different combinations of peak values and shock durations to be excited. By definition [1], the shock sensitivity Ssh is calculated as the quotient of the output charge peak value of the accelerometer and the peak value of the interferential measured shock acceleration (evaluation in the time domain). It is dependent on the impact spectrum, the duration of impact and the peak acceleration value
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