Fatigue Analysis Research Papers - Academia.edu (original) (raw)

High-speed shaft couplings for wind turbine should be capable of not only reliably
transmitting power while absorbing axial and radial displacements that might occur,
as general industrial couplings do, but also providing an insulation function to ensure
that high current in a generator does not flow into the speed increaser.
The present study intended to assess the safety of high-speed shaft couplings for
wind turbine by performing various analytical methods on their components,
including structural analysis, fatigue analysis, and critical speed analysis. Structural
analysis results showed that all major components tested, i.e., a disk pack, flange,
spacer, and torque limiter, had a safety factor with respect to yield strength, i.e., the
ratio of yield strength to the maximum stress, of 1.3 or higher. The results verified the
safety of the corresponding components, especially in terms of design. Also, a fatigue
analysis was conducted on these high-speed shaft couplings using the Markov Matrix,
which concerns load and cycle data, under the Palmgren–Miner Rule to determine
accumulated damage. As a result, all tested components were determined to be safe,
given that the accumulated damage for each item was less than 1. In the meantime, a
critical speed analysis was carried out within a given operating speed range.
Vibration sources of these high-speed shaft couplings were modeled, and the
corresponding natural frequencies were determined, and, as a result, it was confirmed
that the critical speed was close to the operating speed of 1,200 rpm