HIGHLIGHTS
SUMMARY
Machines emitting high-frequency shock vibrations, e_g, impact wrenches, bucking bars, chipping hammers, etc. have since long been identified as a special risk factor and the current standard for evaluation of risk is limited to frequencies below 1250 Hz. The term ultravibration is used to define vibration with frequency above 1250 Hz, which is in analogy with ultrasound as frequencies above the human perception threshold. In legislative and standard texts the terms shock, impact, peak and transient vibration are frequently used to underline the special risk associated with these kinds of vibrations. Despite this . . .
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