# A Systematic Literature Review of Various Control Techniques for Active Seat Suspension Systems
## 8 Control Methods Used in the Active Seating Suspension System
### Other Control Techniques
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**References** & **Control** & **Actuator** & **Biodynamic** & **Summary** \\ \hline \multirow{4}{*}{[76]} & H\({}_{\text{oo}}\) & & & Experimentally measured \\  & With friction & Rotary Servo & 1 DOF & RMS Reduction by 57\%, VDV \\  & compensation & motors & seat suspension model & and SEAT reduction by \\  & compensation & & & approximately 35\% \\ \hline \multirow{4}{*}{[75]} & H\({}_{\text{oo}}\) & & & Experimentally measured \\  & with friction & Rotary servo & 2 DOF & RMS reduction by 32\%, VDV \\  & compensation & motors & seat suspension model & and SEAT reduction by \\  & & & & approximately 43\% \\ \hline \multirow{4}{*}{[45]} & H\({}_{\text{oo}}\) & & & Driver mass variation was \\  & with disturbance & Rotary servo & 2 DOF & considered in the design. \\  & observer-based T-S fuzzy & motors & seat suspension model & Experimentally measured \\  & & & & RMS reduction by 45.5\% \\ \hline \multirow{4}{*}{[77; 78]} & H\({}_{\text{oo}}\) & - & 3 DOF & Numerical results. \\  & & - & quarter-car & Numerical results. \\  & & & suspension model & Time domain results \\ \hline \multirow{4}{*}{[80]} & H\({}_{\text{oo}}\) & - & 3 DOF & Numerical results. \\  & & - & seat suspension model & Acceleration PSD plots and \\  & & & & Time domain results. \\ \hline \multirow{4}{*}{[92]} & SMC & & & \\ State observer & & & 8 DOF & \\ and disturbance & & - & quarter-car suspension & Simulated SEAT reduction by \\  & observer are used to & & model and & 80\%. RMS Reduction by 77.6\% \\  & estimate the uncertainty & & passenger model & \\ \hline \multirow{4}{*}{[91]} & TSMC & & & \\ State observer & & & 6 DOF & Experimentally measured \\  & to reduce the SMC & Rotary & seat and passenger car & RMS reduction by 54.6\%, VDV \\  & chatter. & servo motors & quarter & reduction in by 32.6\% and \\  & & used to estimate the & suspension models & SEAT reduction by 34.1\% \\  & absolute seat velocity. & & & \\ \hline \multirow{4}{*}{[69]} & Primary and secondary & Hydraulic shock & & Experimentally measured \\  & controller with & absorber and & & reduction of SEAT value by \\  & adaptation mechanism & pneumatic spring & 1 DOF & 45\% with low human body \\  & & & seat suspension model & mass (50 kg) and reduction of \\  & & & & SEAT value by 38\% with high \\  & PID Controller with & & & human body mass (120 kg). \\ \hline \multirow{4}{*}{[83]} & Piedforward (preview information) and & Electromagnetic & 4 DOF & Experimentally measured \\  & feedforward (preview information) and & linear actuator & quarter-car & reduction of the SEAT value \\  & feedback states & & suspension model & and RMS acceleration by 25\% \\ \hline \multirow{4}{*}{[64]} & SMC and ANFIS & - & 3 DOF & Numerical simulation with \\  & & & quarter-car & VDV reduction by 71\% from \\  & & & suspension model & the passive to active \\  & & & quarter-car suspension model \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Summary of recent work of active seat suspension control in the vertical vibration direction.