A new type of damper combining eddy current damping with rack and gear, which can simultaneously export damping and inertial forces, is proposed. Eddy current damping with rack and gear is supposed to be installed between the building superstructure and foundation to mitigate the seismic response of the building. First, the concept of eddy current damping with rack and gear is introduced in detail and its apparent mass and equivalent damping coefficient are both theoretically investigated. Second, a prototype of eddy current damping with rack and gear is manufactured, and a series of tests on the prototype are carried out to verify its structural parameters. The experimental and theoretical results of the apparent mass of the prototype agree well with each other. The experimental result of the equivalent damping coefficient of the prototype is slightly lower than the numerical results obtained from COMSOL Multiphysics and its maximum relative differences are 11.3% and 13.6% for α = 0° and 45°, respectively. Third, detailed parametric studies on the damping force, including the effects of the thickness of the conductor plate, air gap, and number and location of permanent magnets, are conducted. The results show that the damping force keeps a linear relationship with velocity if it is lower than 0.15 m/s, and with the increase of the velocity, a strong nonlinear relationship between the damping force and the velocity is observed. The available maximum damping force can be increased by decreasing the thickness of the conductor plate and the air gap, increasing the number of permanent magnets. There is an optimal location about the permanent magnets for the available maximum damping force. In addition, the hysteretic curves of the eddy current damping with rack and gear obtained from the test indicate that the ability of energy dissipation is considerable.

提出了一种涡流阻尼与齿条和齿轮相结合的新型阻尼器，该阻尼器可以同时输出阻尼力和惯性力。应当在建筑物上部结构和地基之间安装带齿条和齿轮的涡流阻尼器，以减轻建筑物的地震响应。首先，详细介绍了齿条和齿轮涡流阻尼的概念，并从理论上研究了其表观质量和等效阻尼系数。其次，制造了具有齿条和齿轮的涡流阻尼原型，并对该原型进行了一系列测试以验证其结构参数。原型表观质量的实验和理论结果彼此吻合。α分别为0°和45°。第三，对阻尼力进行了详细的参数研究，包括导体板厚度，气隙以及永磁体数量和位置的影响。结果表明，当阻尼力小于0.15 m / s时，阻尼力与速度保持线性关系，随着速度的增大，阻尼力与速度之间存在很强的非线性关系。可以通过减小导体板的厚度和气隙，增加永磁体的数量来增加可用的最大阻尼力。永磁体周围有一个最佳位置，以提供最大的阻尼力。此外，