Active Vibration Control for Marine Platform Flatness Using Sliding Mode Scheme

Various industries adopt different techniques for isolating or reducing vibration. This paper investigates flatness control for fitted equipment on marine vessels which are subject to random sea wave. These disturbances significantly affect the operational quality and durability of marine systems, thereby decreasing overall safety. In hostile environments where safety considerations are important, vibration isolators are often used to suppress the effects of vibrations. The system described here is based on a four degree-of-freedom active marine suspension model, which allows for effective disturbance rejection. Sliding Mode Control (SMC) is then used to reduce the disturbance simulated as random sea waves. It has been shown that this method offers the advantages of easy implementation, reduced maintenance requirements, increased system efficiency and reduced vibration.