Influence of Periodic Impulse Characteristics on the Steady-State Vibration Response of a Drill String
Keywords:Exploration drilling, drill string dynamics, periodic impulse, steady-state vibration response
Transient impact drilling can significantly improve drilling efficiency and is widely applied in geological engineering, mining and other fields. Because transient impact drilling causes vibration noise and fatigue damage to drilling equipment, it is vital to study the influence of periodic impulses on percussive drilling systems. In this paper, periodic impulses with different peaks and durations that have the forms of rectangular waves, half sine waves and triangle waves are considered to study the influence of periodic impulse characteristics on percussive drilling systems by transforming the periodic impulse into Fourier series. When the impulse is unequal, the drill string resonates at frequencies that are multiples of the impact frequency. In this situation, the amplitudes of the vibration response in the resonance region are of big difference, but there is little difference in the non-resonance region. When the impulse is equal, the drill string vibration response under periodic impulses with different characteristics is the same. Therefore, the dynamic analysis and design of the percussive rock drilling system mainly relies on the transient impulse characteristics (peak, duration and period), which can simplify the design process and decrease the difficulty in engineering measures of transient impact.
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