Vibration characteristic analysis of body on down-hole close-loop adjustable stabilizers
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According to Lagrange equation, Body's vibrating mathematical model and a formula for calculation of eigenvalue are set up and derived. The author uses CAD software-UG to set body's solid modeling. With CAE software MSC/NASTRAN, the finite element analysis modeling is set. Then through further calculation, inherent frequencies and mode shapes of body are obtained. The results acquired provide a foundation for operation reliability analysis of the Down-hole close-loop adjustable stabilizers.