Semi-Active Suspension Systems: From Advanced Control Algorithms to Emerging Off-Road and Agricultural Applications.

Semi‑active suspension systems are a key technology for making rides smoother and keeping vehicles stable, especially in tough off‑road and farm settings. This work looks at how to design, simulate, and test advanced control algorithms—H‑infinity robust control, Linear Parameter‑Varying (LPV) control, and Model Predictive Control (MPC)—that work with semi‑active dampers. Unlike traditional passive suspensions, these controllers change the damping coefficient in real time. By doing so, they cut down vibrations from uneven ground, protect the vehicle’s structure, and improve operator safety. The study puts special emphasis on modeling the non‑linear behavior of the dampers, the limits of the actuators, and the changing payloads that are common on agricultural machines. A

series of detailed simulations run on rough‑terrain profiles are used to evaluate each control approach. The main performance measures are how much vertical acceleration is reduced, whether suspension travel stays within limits, and how well the tires stay in contact with the ground. The resulting framework gives clear steps for creating and validating robust control laws, providing a practical path from theoretical design to simulation‑based testing for heavy‑duty vehicles.

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