Development of New Type Linear Friction Damper and Its Application to Vibration Isolation and Reduction System

对于被动隔震系统，摩擦阻尼器因其简单、廉价和可靠而被经常使用。但是，普通的恒摩擦力摩擦阻尼器在摩擦力较大时隔振特性下降，当摩擦力较小时共振峰值变大，因而具有一定的性能局限性。此外，在扰动消失后，位移仍远离平衡位置。为了克服上述缺点，本文提出了一种新型摩擦阻尼器。阻尼器的设计目的是使摩擦力的大小与相对位移成正比，通过将带旋转弹簧的斜杆接触到圆柱体上。实验和数值结果验证了该机制的有效性。

For a passive isolation system, a friction damper is often used because it is simple, inexpensive and reliable. However, the ordinary friction damper of constant friction force has performance limitation, because the isolation characteristic declines when the friction force is large, while resonant peak becomes large when the friction force is small. Furthermore, the displacement remains apart from the equilibrium position after the disturbance disappeared. In order to overcome above drawbacks, the new type of friction damper is proposed in this paper. The damper is devised to make the magnitude of the friction force proportional to the relative displacement by contacting the inclined lever with rotational spring to the cylindrical block. The experimental and numerical results verified the effectiveness of the proposed mechanism.