## 4 Results and Validation
### Small-Scale Testing
#### 4.1.1 Shaking Table Tests
\begin{table}
\begin{tabular}{p{113.8 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt}} \hline \hline
**Acceleration Spectrum** & **Accelerometer** & **Accelerations Range (g)** & **R\({}^{2}\)** & **RMS Error (g)** \\ \hline Original sampling frequency & PCB L74 & 0.11–0.47 & 0.940 & - \\ ADXL355 RBP1 & 0.10–0.44 & 0.975 & 0.020 \\ ADXL355 RBP4 & 0.11–0.49 & 0.917 & 0.030 \\ \hline
100 Hz resampling frequency & PCB L74 & 0.074–0.37 & 0.956 & - \\ ADXL355 RBP1 & 0.078–0.38 & 0.983 & 0.015 \\ ADXL355 RBP4 & 0.081–0.39 & 0.982 & 0.028 \\ \hline Highest 100 acceleration peaks mean & PCB L74 & 0.059–0.33 & 0.975 & - \\ ADXL355 RBP1 & 0.058–0.32 & 0.986 & 0.0049 \\ ADXL355 RBP4 & 0.063–0.34 & 0.984 & 0.0093 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Summary of the results obtained from the 0.25 cm displacement frequency chirp. Figure 13: Acceleration spectra for the 0.50 cm displacement frequency chirp: (**a**) Maximum acceleration spectrum from original sampling frequency. (**b**) Maximum acceleration spectrum from 100 Hz resampling frequency. (**c**) Acceleration spectrum from the mean of the highest 100 acceleration peaks from 100 Hz resampling frequency. \begin{table}
\begin{tabular}{p{113.8 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt}} \hline \hline
**Acceleration Spectrum** & **Accelerometer** & **Accelerations Range (g)** & **R\({}^{2}\)** & **RMS Error (g)** \\ \hline Original sampling frequency & PCB L74 & 0.11–1.08 & 0.987 & - \\ ADXL355 RBP1 & 0.098–0.93 & 0.991 & 0.11 \\ ADXL355 RBP4 & 0.10–0.98 & 0.991 & 0.090 \\ \hline
100 Hz resampling frequency & PCB L74 & 0.076–0.81 & 0.990 & - \\ ADXL355 RBP1 & 0.075–0.79 & 0.992 & 0.016 \\ ADXL355 RBP4 & 0.077–0.80 & 0.990 & 0.032 \\ \hline Highest 100 acceleration peaks mean & PCB L74 & 0.054–0.68 & 0.993 & - \\ ADXL355 RBP1 & 0.052–0.68 & 0.998 & 0.0077 \\ ADXL355 RBP4 & 0.056–0.69 & 0.997 & 0.017 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Summary of the results obtained from the 0.50 cm displacement frequency chirp. Figure 14: Acceleration spectra for the 0.75 cm displacement frequency chirp: **(a)** Maximum acceleration spectrum from original sampling frequency. **(b)** Maximum acceleration spectrum from 100 Hz resampling frequency. **(c)** Acceleration spectrum from the mean of the highest 100 acceleration peaks from 100 Hz resampling frequency. Figure 15: Spectrograms for the 0.10 cm displacement frequency chirp: **(a)** PCB L74 spectrogram. **(b)** ADXL355 RBP1 spectrogram. **(c)** ADXL355 RBP4 spectrogram. \begin{table}
\begin{tabular}{l l l l l} \hline \hline
**Acceleration** & **Accelerometer** & \begin{tabular}{l} **Accelerations** \\ **Range (g)** \\ \end{tabular} & \
\begin{tabular}{l} **R2** \\ **Error (g)** \\ \end{tabular} &
\begin{tabular}{l} **RMS** \\ **Error (g)** \\ \end{tabular} \\ \hline Original & PCB L74 & 0.19–2.1 & 0.990 & - \\ sampling & ADXL355 RBP1 & 0.13–1.33 & 0.976 & 0.28 \\ frequency & ADXL355 RBP4 & 0.15–1.36 & 0.988 & 0.27 \\ \hline
100 Hz & PCB L74 & 0.11–1.01 & 0.984 & - \\ resampling & ADXL355 RBP1 & 0.10–1.04 & 0.988 & 0.015 \\ frequency & ADXL355 RBP4 & 0.11–1.02 & 0.987 & 0.019 \\ \hline Highest 100 & PCB L74 & 0.071–0.87 & 0.981 & - \\ acceleration & ADXL355 RBP1 & 0.068–0.89 & 0.985 & 0.0091 \\ peaks mean & ADXL355 RBP4 & 0.076–0.87 & 0.983 & 0.016 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Summary of the results obtained from the 0.75 cm displacement frequency chirp.