MODELING AND EXPERIMENTAL STUDY OF A SEMI-ACTIVE BLADE DAMPER

Blade damper is a new type of energy dissipation device, which is used to absorb energy and reduce vibration to realize the protection of a structural system. A semi-active blade damper used for the vibration reduction of a helicopter control system is proposed. The motor drives the adjusting screw to change the size of the damping gap so as to control the damping torque. Based on MTS testing machine, the indicator test of the damper is carried out and its dynamic characteristics are studied. To accurately track the highly nonlinear mechanical characteristics of the damper, an improved hyperbolic tangent model is proposed, and the modified adaptive genetic algorithm is used to identify the parameters of the model. Through the error analysis between the simulation data and the test data, it is concluded that: compared with the other two existing models, the improved hyperbolic tangent model can more accurately simulate the force characteristics of the damper; after integrating the relationship between model parameters and motor position with polynomial, the model can still maintain a certain accuracy under different working conditions, which shows that the model can be used for semi-active control.