WebApr 1, 2007 · The conclusion was that the cyclic vibration behavior was a form of “Morton effect,” as discussed in recent research papers. The worn bearing clearances and shaft straightness were being changed by the bearing oil film temperature, which in turn was being affected by the vibration level, which was in turn affected by the instantaneous … Webresulted in high cyclic vibration levels, cycling in a sinusoi-dal motion over a period of several minutes whenever the bear-ing supply temperature dropped below 125° F. None of the common causes of excess 1 ¥ vibrations, operat-ing alone, should cause the cyclic behavior observed. Shaft bow, however, has been observed by others in certain ...

3D numerical modeling of the effect of the drill string vibration ...

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Experimental Study on the Viscosity of Soft Cohesive ... - Springer

WebVortex-induced vibration (VIV) is probably the single most important design issue for steel catenary risers, particularly for high current locations. High frequency vibration of the riser pipe due to vortex shedding leads to high frequency cyclic stresses, which can result in high rates of fatigue damage. Vortex-induced vibration occurs anytime ... Cyclic stress is the distribution of forces (aka stresses) that change over time in a repetitive fashion. As an example, consider one of the large wheels used to drive an aerial lift such as a ski lift. The wire cable wrapped around the wheel exerts a downward force on the wheel and the drive shaft supporting the wheel. Although the shaft, wheel, and cable move, the force remains nearly vertical relative to the ground. Thus a point on the surface of the drive shaft will undergo tensio… http://www.sandv.com/downloads/0605mars.pdf shuttle from lax to carlsbad ca