2.7.1 Vibration Excitation MechanismsThere are many excitation mechanisms (sources) that cause vibration to occur in drilling. Much of the research on the topic has been conducted in the oil and gas industry, but several of the results can be applied to the mining field. Some of these sources include mass imbalances, misalignment of the drill string, buckling of the drill string, tri‐cone bit effects and rotational walk of the drill string. These sources occur at multiples of the rotation speed.
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