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.008a.svgz" name="7643451.fig.008a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Ultrasonic amplitude</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/sv/volume-2017/7643451/figures/7643451.fig.008b.svgz" name="7643451.fig.008b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Dominant frequency amplitude</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/sv/volume-2017/7643451/figures/7643451.fig.008c.svgz" name="7643451.fig.008c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>Ultrasonic velocity</td></tr></table>

<div>The result of regression equation of ultrasonic parameters.</div>

Shock and Vibration

fig8

Figure 8

Figure 8: Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition 