Characterizing nonlinear oscillation behavior of an MRF variable rotational stiffness device

摘要: Magneto-rheological fluid (MRF) rotatory dampers are normally used for controlling the constant rotation of machines and engines. In this research, such a device is proposed to act as variable stiffness alleviate rotational oscillation existing in many engineering applications, motor. Under thought, main purpose work characterize nonlinear torque-angular displacement/angular velocity responses an MRF based oscillatory motion. A hysteresis model, consisting spring, viscous damping element error function-based element, proposed, which capable describing unique dynamical characteristics smart device. To estimate optimal model parameters, modified whale optimization algorithm (MWOA) employed on captured experimental data torque, angular displacement under various excitation conditions. MWOA, parameter updating mechanism adopted replace traditional linear one, enhancing global search ability initially local at later stage evolution. Additionally, immune operation introduced individual selection, improving identification accuracy solution. Finally, dynamic testing results validate performance effectiveness algorithm.