مدل‌سازی و تحلیل دینامیکی یک مکانیزم جداساز ارتعاشی با سختی منفی

Negative stiffness vibration isolators have attracted the attention of designers due to their high static-low dynamic stiffness characteristics and their unique nonlinearity. When designing a negative stiffness vibration isolator, the main idea is to introduce a negative stiffness mechanism to compensate for the positive stiffness of the elastic elements. Negative stiffness has always been one of the challenging issues in dynamics and vibrations. A mechanical spring always creates a force against the direction of the applied force, but sometimes in some mechanisms, the set of springs are placed in such a way that in a certain range, the force they apply will be in the same direction as the external force. In this case, we say that this set of springs has negative stiffness. In this article, the nature of negative hardness has been discussed and a mechanism that has negative hardness has been presented. The relationships related to the forces in this mechanism have been extracted and the relationship of negative stiffness to the parameters of the problem has been obtained.