Natural Frequency of Coal: Mathematical Model, Test, and Analysis on Influencing Factors

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2022/7891894/figures/7891894.fig.003a.svgz" name="7891894.fig.003a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Schematic diagram</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2022/7891894/figures/7891894.fig.003b.svgz" name="7891894.fig.003b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Physical map</td></tr></table>

<div>Testing device of coal natural frequency.</div>

Geofluids

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Figure 3

Figure 3: Natural Frequency of Coal: Mathematical Model, Test, and Analysis on Influencing Factors 