## 5 Results and Analysis
### Experimental Analysis Using Vibration-Damping Materials  
Rubber was used as the damping material for the test, and the voltage and amplitude data were recorded and shown in Table 3.  
Figure 9 shows the amplitude and charge voltage diagram using rubber as the damping material, and Figure 10 shows the amplitude and charge voltage diagram using EVA sponge as the damping material. EVA sponge was adopted as the damping material for the test, and the voltage and amplitude data were recorded and shown in Table 4. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Time (ms)** & **Vibration Amplitude (mm)** & **Voltage (V)** & **Frequency (HZ)** \\ \hline
166 & 1.86 & 2.46 & 5 \\
167 & 1.93 & 2.44 & 5 \\
168 & 1.92 & 2.29 & 5 \\
169 & 1.92 & 2.59 & 5 \\
170 & 1.92 & 2.96 & 5 \\
171 & 1.90 & 2.89 & 5 \\
172 & 1.86 & 2.96 & 5 \\
173 & 1.93 & 2.98 & 5 \\
174 & 1.56 & 2.62 & 5 \\
175 & 1.56 & 2.69 & 5 \\
176 & 1.56 & 2.99 & 5 \\
177 & 1.92 & 2.75 & 5 \\
178 & 1.92 & 3.01 & 5 \\
179 & 1.92 & 2.83 & 5 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: _Cont._  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Time (ms)** & **Vibration Amplitude (mm)** & **Voltage (V)** & **Frequency (HZ)** \\ \hline
150 & 1.29 & 2.29 & 5 \\
151 & 1.49 & 2.36 & 5 \\
152 & 1.55 & 2.56 & 5 \\
153 & 1.56 & 2.59 & 5 \\
154 & 1.34 & 2.31 & 5 \\
155 & 1  
A comparative analysis of Figures 8 and 9 reveals a notable reduction in both amplitude and charge voltage when rubber is utilized as a damping material. Moreover, comparing Figure 10 with Figure 9 indicates that the employment of EVA sponge as a damping material yields superior damping performance. Specifically, the vibration  
Figure 10: Amplitude and charge voltage diagram of EVA sponge as vibration damping material. Figure 9: Rubber as a vibration-damping material with amplitude and charge voltage. interference-induced voltage signal is significantly suppressed, and the voltage signal arising from grain impact on the impact plate can be accurately distinguished. To further verify the damping effect of vibration-damping materials at different vibration frequencies, a set of tests are added. Three vibration frequencies of 4 Hz, 5 Hz, and 6 Hz were set respectively when there was no vibration damping material, the vibration damping material was rubber and the vibration damping material was EVA sponge. The experimental procedure is as follows:  
1. On the premise of the vibration test bench as shown in Figure 7, the impact plate of the loss detection sensor is fixed on the test bench without any vibration-damping material. The charge amplifier is connected to the piezoelectric ceramic lead and can work normally. 2. Start the vibrating motor, set the vibration frequency as 4 Hz, 5 Hz, and 6 Hz respectively, and collect 100 groups of data with a sampling frequency of 10 Hz using the charge amplifier. A total of 300 groups of test data are collected, including voltage value and vibration amplitude value, which are recorded and saved. 3. Take the adhesive rubber material below the impact plate of the loss detection sensor as the vibration reduction material, and repeat step 2. 4. Take the EVA sponge material attached to the bottom of the impact plate of the loss detection sensor as the damping material, and repeat Step 2. 5. Classify the data according to frequency and do mean processing. The mean value of the obtained data is taken as the effective data under the current frequency. The processed data is shown in Table 5.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Time (ms)** & **Vibration Amplitude (mm)** & **Voltage (V)** & **Frequency (HZ)** \\ \hline
150 & 0.54 & 1.06 & 5 \\
151 & 0.53 & 1.08 & 5 \\
152 & 0.50 & 1.00 & 5 \\
153 & 0.49 & 0.98 & 5 \\
154 & 0.48 & 0.89 & 5 \\
155 &  
+++ ==WARNING: Truncated because of repetitions==  
++  
The data presented in Table 5 depicts the amplitude and charge voltage readings obtained at varying source frequencies.