Optimal Cost-Effective Maintenance Policy for a Helicopter Gearbox Early Fault Detection under Varying Load

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/mpe/volume-2017/4682409/figures/4682409.fig.007a.svgz" name="4682409.fig.007a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Broken drive gear</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/mpe/volume-2017/4682409/figures/4682409.fig.007b.svgz" name="4682409.fig.007b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Five fully broken and two partially broken teeth</td></tr></table>

<div>Test results of the drive gear.</div>

Mathematical Problems in Engineering

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Figure 7

Figure 7: Optimal Cost-Effective Maintenance Policy for a Helicopter Gearbox Early Fault Detection under Varying Load 