• 【Title】Development of a Negative Stiffness Friction Damping Device with an Amplification Mechanism
• 【Abstract】This paper proposes an innovative negative stiffness friction damping device (NSFDD), which is characterized with a combination of negative stiffness and friction damping force. The large force capacity of the NSFDD is realized by the amplification mechanism of a two-consecutive lever and using the pre-compressed gas springs. A mechanical model is developed to represent the force-displacement relationship of the proposed NSFDD. The influence of key parameters on the NSFDD performance is analyzed using this mechanical model and demonstrates the advantage of using pre-compressed gas springs. A NSFDD specimen was manufactured and examined by experimental tests. The NSFDD specimen exhibits an obvious negative stiffness and stable energy dissipation, demonstrating the feasibility and effectiveness of the NSFDD. Finally, a refined finite element (FE) model is developed to represent the NSFDD. Both the experimental tests and FE simulation validate the accuracy of the mechanical model of the NSFDD.
• 【Keywords】Negative stiffness; Friction damping; Amplification mechanism; Mechanical model; Experimental test
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