Semi-active fuzzy control of SDOF systems under loading of rotary machines by tuned mass dampers

Dynamic vibrations of mechanical equipment affect the magnificent performance of themselves, and the other structures installed on them. The gradual increasing of their angular velocity leads to some rare occurrence such as Resonance, Pseudo Resonance, Beating, Pseudo Beating phenomenon and so on, when it has gone on angular velocity of mentioned structures. Therefore, dynamic responses of these structures should be declined. In this study, active and semi-active control approaches have been used to going down the responses of a single degree of freedom structure subjected to the above-mentioned probabilistic phenomenon. In addition, some existence optimum functions have been applied to determining the TMD’s frequency and damping parameters. These parameters of semi-active TMD are predicted utilizing two different strategies, the Fuzzy Logic system and Ground-Hook algorithm. The logic of making alteration to damping ratio is based on regaining the equilibrium of structure as it vibrates. Copping with different phenomenon, results of this investigation indicate the advantages of semi-active tuned mass damper usage to drop dramatically the system displacement by 32 to 47 percent. Moreover, using of fuzzy logic systems in order to set damping parameters of TMD, results in 1.5 to 6.2 percent more downward trend in comparison to Ground-Hook algorithm. The done analysis for a wide range of optimal frequencies illustrate that fuzzy logic system is lowly sensitive to determination of TMD’s optimal frequency.