Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/sv/volume-2017/7643451/figures/7643451.fig.004a.svgz" name="7643451.fig.004a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Environmental noise signals</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/sv/volume-2017/7643451/figures/7643451.fig.004b.svgz" name="7643451.fig.004b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Experimental results of cyclic loading and unloading</td></tr></table>

<div>The AE filtering experiment results of coal under loading and unloading.</div>

Shock and Vibration

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Figure 4

Figure 4: Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition 