This research addresses the literature, design and construction of a quasi-zero-stiffness (QZS) isolator along with a hydraulic actuator. A sample vibration isolator with a 50 kg mass was designed using quasi-zero-stiffness springs, then simulated in the ADAMS View software and the results were verified by the theoretical ones. The performance of the proposed system was compared with the conventional isolator and the superiority of the QZS suspension system was proved. The main purpose of this study was to investigate the performance of the QZS suspension system in overload and underload conditions and make the mass in its equilibrium position using a hydraulic actuator. A proportional hydraulic valve, and various controllers such as PID, tuned PID, and fuzzy PID were employed to control the mass at the desired position. The results revealed that the fuzzy PID controller performed much better than the other ones in terms of the transmissibility and robustness against noise. Finally, an experimental setup was constructed to verify some of the theoretical results. Keywords: Suspension system, Quasi-zero-stiffness isolators, Proportional hydraulic valve, Hydraulic Actuator, Fuzzy PID control
