Engineering fatigue is a very prevalent and dangerous phenomenon that limits the useful life span of mechanical structures. It can be found in most engineered structures machinery are made from metallic or composite materials. The prediction methodology under variable amplitude loading (VAL), however, has not reached maturity due to complexity loading. This results load sequence effects, which ...

We propose a combining of the Caponand the APES spectral estimators for estimation of both the amplitude and the frequency of spectral lines. The so-obtained estimator does not suffer from Capon’s biased amplitude estimates neither from APES biased frequency estimates or resolution problem. Furthermore, the combined estimator is computationally simpler than APES, and has about the same complexi...