A novel design of cubic stiffness for a Nonlinear Energy Sink (NES) based on conical spring
Résumé
Mitigation of unwanted vibration is an important issue in aeronautics and space area. Since the emergence of innovative absorber Nonlinear Energy Sink (NES), more attentions were paid to this promising technique. This absorber is characterized by a secondary mass highly coupled via a nonlinear stiffness to the main structure that needs to be protected. The mastery of the nonlinearity is a key element for obtaining optimum performance for NES. However, it is difficult to implement cubic stiffness without linear part. In this paper, a novel design NES of cubic stiffnes without linear part is presented. For this, the two conical springs are specially sized to provide the polynomial components only with linear and cubic term. To counterbalance the linear term, a concept of negative stiffness mech-anism is implemented by two cylindrical compression spring. A small sized NES system is developed. To validate the concept, the load-displacement relation test is performed, and simulation under period excitation and transient loading is studied. Future developments will aim experimental validation and application of the prototype.
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