In the engineering field, vibration most often has a negative impact on the operation of systems and the operator's body, causing various problems such as occupational diseases, damage to structures, a decrease in the accuracy of equipment, etc. Therefore, it is extremely important to apply vibration isolation methods. Nonlinear QZS systems, which have emerged in recent decades, have attracted significant attention and active research due to their high potential for low-frequency vibration isolation. Compared to the linear system, the quasi-zero stiffness system exhibits a lower initial isolation frequency and enhanced isolation capability at the resonance frequency. Consequently, the quasi-zero stiffness isolator demonstrates superior low-frequency vibration isolation performance. The analysis of scientific publications on seat suspension systems led to developing a basic design concept for a semi-active seat suspension system with controlled quasi-zero stiffness using adaptive piezoceramic elements. The selection of piezoceramic elements lays the foundation for a theoretical framework to address the problem of effective vibration isolation. Modeling and numerical results indicate the potential effectiveness of this proposed solution in reducing seat vibrations.