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

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr class="thead"><td class="align_left">Waveform</td><td class="align_center">Dominant frequency</td><td class="align_center">Firing interval </td><td class="align_center">Threshold</td><td class="align_center">Sampling frequency</td><td class="align_center">Fluctuation amplitude</td><td class="align_center">Waveform length</td></tr><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr><td class="align_left">Sine wave</td><td class="align_center">300 kHz</td><td class="align_center">2 s</td><td class="align_center">40 dB</td><td class="align_center">500 ksps</td><td class="align_center">2 V</td><td class="align_center">1k</td></tr><tr class="table-tr"><td colspan="7"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

The detailed information of the generated ultrasonic signals.

Shock and Vibration

tab2

Table 2

Table 2: Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition 