## 3 Experimental Study
### Experimental Results and Discussion  
Experiments were conducted on the hybrid isolation device under harmonic wave and seismic wave loading. The harmonic wave loading test effectively evaluates the response of the isolation device at a specific frequency and analyzes the variation of the transmission ratio under different frequencies and amplitudes. In earthquakes, the damage to buildings and structures is primarily caused by large amplitude, low-frequency vibrations, and seismic waves typically have dominant low-frequency components. After passing through the ground and structures, seismic energy is concentrated in the range of \(1\) to \(10\) Hz. Therefore, this study uses waveforms with frequencies of \(1\) Hz, \(5\) Hz, and \(10\) Hz for the experiments.  
Figure 5 illustrates the response of the hybrid isolation system under harmonic wave conditions, where the seismic load is a harmonic wave with an amplitude \(|\,\mathrm{A}\,|=1\) and a frequency of \(1\) Hz. Figure 5 shows the displacement response of the hybrid isolation system under harmonic waves. The displacement and acceleration of the superstructure are significantly lower than those of the substructure. The peak displacement of the  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Parameter** & **Unit** & **Range** \\ \hline X Displacement & mm & (\(-185\), \(260\)) \\ Y Displacement & mm & (\(-200\), \(200\)) \\ Z Displacement & mm & (\(-111\), \(111\)) \\ X Acceleration & g & \(\pm 2\) \\ Y Acceleration & g & \(\pm 2\) \\ Z Acceleration & g & \(\pm 2\) \\ Operating Frequency & Hz & (\(0\), \(30\)) \\ Table Size & mm & (\(2500\times 1500\)) \\ Payload & kg & \(400\) \\ \hline \hline \end{tabular}
\end{table}
Table 1: Parameter of simulation shaker system.  
Figure 4: Simulation shaker system.  
superstructure is 0.000947 m, while the peak displacement of the substructure reaches 0.00184 m. The peak isolation rate of the hybrid isolation system under harmonic waves is 48.5%.  
Figure 6 illustrates the response of the hybrid isolation system under harmonic wave conditions, where the seismic load is a harmonic wave with an amplitude \(\mid\)A \(\mid\) = 1 and a frequency of 5 Hz. Figure 6 shows the displacement response of the hybrid isolation system under harmonic waves. The displacement and acceleration of the superstructure is 0.00571 m, while the peak displacement of the substructure reaches 0.0136 m. The peak isolation rate of the hybrid isolation system under harmonic waves is 49.7%.  
Figure 7 illustrates the response of the hybrid isolation system under harmonic wave conditions, where the seismic load is a harmonic wave with an amplitude \(\mid\)A \(\mid\) = 1 and a frequency of 10 Hz. Figure 7 shows the displacement response of the hybrid isolation system under harmonic waves. The displacement and acceleration of the superstructure are significantly lower than those of the substructure. The peak displacement of the superstructure is 0.00671 m, while the peak displacement of the substructure reaches 0.03381 m. The peak isolation rate of the hybrid isolation system under harmonic waves is 80.2%.  
The harmonic wave experiments show that the isolation system achieves approximately a 50% isolation rate under the influence of 1 Hz and 5 Hz harmonic waves. Under the influence of a 10 Hz harmonic wave, the isolation rate reaches about 80%. The experimental results indicate that the hybrid isolation system performs optimally around 10 Hz.  
Figure 5: Displacement response in a simple harmonic state with an amplitude of 1 and a frequency of 1 Hz.  
Figure 6: Displacement response in a simple harmonic state with an amplitude of 1 and a frequency of 5 Hz.  
The harmonic wave experiments demonstrate that the hybrid isolation device exhibits good isolation performance.