Kinematics and Mechanical Properties Analyses on Vibration Converter of Intelligent Damper for Drill Strings |
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Authors: | Xiaohua Zhu & Chunlin Lai |
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Abstract: | Taking vibration converter of intelligent damper for drill strings as the
study object, this paper analyzes the influential factors of motion state
of the ball and conducts an explicit dynamics simulation by establishing a
mechanics model of vibration converter. The study basis is Newton's laws of
motion, D'Alembert's principle and Hertz contact theory. And we use world
coordinate system, rotating coordinate system and Frenet coordinate system
to deduce kinematics equations of vibration converter. The ultimate result
demonstrates that the axial velocity and maximum contact stress change with
the increment of ball diameter and helix angle. It also proves the validity of
our derived kinematics and mechanical models and provides a good consultant
value for the design and theoretical arithmetic of vibration converter for
intelligent damper of drill strings. |
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Keywords: | Intelligent damper vibration converter kinematics analysis contact stress |
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