## 5 Conclusions and Prospects  
Listed below are this article's main conclusions and innovations:  
1. This study examined the effect of structural parameters on the stiffness and damping characteristics of rubber-based SMA composite dampers. The results indicate that variations in the SMA metal module's structural parameters have a more significant impact on the composite damper's stiffness and damping than changes in the rubber damper's structural parameters. Among these parameters, the thickness of the SMA metal module has the most substantial influence. Increasing this thickness leads to a proportional increase in both the stiffness and damping of the composite shock absorber, with the amplitude of vibration also growing as the thickness increases. Conversely, as the diameter of the SMA metal module increases, the stiffness and damping of the shock absorber decrease, with the rate of reduction diminishing as the diameter grows. The primary function of the inner and outer rubber components is to provide displacement stroke for cushoining vibrations, and their structural parameters have a relatively minor effect on the overall performance of the shock absorber. Nonetheless, increasing the thickness of the outer rubber components slightly enhances the stiffness and damping of the composite shock absorber. Similarly, increasing the width of the shock absorber, which is akin to adding more dampers in parallel, also increases stiffness and damping, while the force-displacement curve characteristics remain consistent. 2. A six-degree-of-freedom vibration differential equation and an Adams multi-body dynamics model were developed for the rubber-based SMA suspension system in commercial vehicle cabins. The comparison of modal frequency numerical results with simulation outcomes showed an error margin of within 2%, confirming the model's reliability. This study then investigated the dynamic response characteristics of the cab suspension system under harmonic excitation with varying loading rates and amplitudes. To enhance cab stability and comfort across different loading conditions, the optimization objective was set to minimize the root mean square value of the seat's \(z\)-axis acceleration. The \(z\)-axis stiffness and damping parameters of the suspension \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Loading Rate (mm/s)**} & **Optimize the Root Mean Square Value of** & **Root Mean Square Value of** & \\  & **Value of \(z\)-Axis Acceleration for** & **Seat \(z\)-Axis Acceleration** & **Difference Percentage (\%)** \\  & **the Front Seat (mm/s\({}^{2}\))** & **After Optimization (mm/s\({}^{2}\))** & \\ \hline
120 & 3.307 & 1.991 & 39.79 \\
240 & 2.832 & 2.1077 & 25.58 \\
360 & 3.1556 & 2.7648 & 12.38 \\
480 & 3.6466 & 3.2312 & 11.39 \\
600 & 4.1917 & 3.7710 & 10.04 \\ \hline \hline \end{tabular}
\end{table} 
Table 13: Comparison of root mean square values of seat \(z\)-axis acceleration under different loading rates before and after optimization. were optimized accordingly. This optimization yielded the ideal stiffness and damping values for harmonic excitation at different loading rates. * Leveraging the optimization outcomes, a structural parameter-matching design for rubber-based SMA composite dampers was executed using response surface methodology (RSM). After finalizing the parameter-matching and optimization design, a meticulous comparative analysis of the vibration reduction effects was undertaken, juxtaposing the pre- and post-optimization scenarios. This methodological approach yielded a substantial reduction in the root mean square value of seat z-direction acceleration across varying loading rates, thereby enhancing the overall ride comfort. The details regarding future research avenues are as follows: 1. Further investigation is needed on the performance changes of rubber-based SMA composite shock absorbers under different temperatures and chemical environments.