Magnetic negative stiffness damper

Abstract

The invention relates to a magnetic negative stiffness damper. The magnetic negative stiffness damper comprises a conductive pipe, an installation shaft, a sliding bearing and one or more pairs of magnets arranged in the axial direction of the conductive pipe. Each pair of magnets comprises the first magnet and the second magnet with the geometric centers located in the same horizontal positions in a balanced state. The first magnets are installed inside the conductive pipe through the installation shaft and are controlled by the sliding bearing to move in the axial direction. The second magnets are fixed to the conductive pipe. The axial magnetization directions of the first magnets and the second magnets are the same, and the negative stiffness function is formed through the relative movement of the first magnets and the second magnets. The conductive pipe is located in the position symmetrical with the two ends of the second magnets, and an electric eddy current damping function is formed through the relative movement of the first magnets and the conductive pipe. The magnetic negative stiffness damper integrates negative stiffness and electric eddy current damping, is simple and compact in structure and is capable of being widely applied to vibration control of construction, mechanical and aerospace structures. 本发明涉及一种磁负刚度阻尼器，包括：导电管、安装轴、滑动轴承以及沿所述导电管轴向排列的一对或多对磁体；每对磁体包括平衡状态下几何中心位于同一水平位置的第一磁体和第二磁体，所述第一磁体通过所述安装轴安装在所述导电管内部由所述滑动轴承控制沿轴向移动，所述第二磁体固定于所述导电管上；所述第一磁体和所述第二磁体的沿轴向磁化方向相同，两者相对运动形成负刚度作用；所述导电管位于所述第二磁体两端对称的位置，所述第一磁体与所述导电管的相对运动形成电涡流阻尼作用。本发明的磁负刚度阻尼器将负刚度和电涡流阻尼结合在一起，其结构简单且紧凑，能广泛应用在土木、机械和航空航天结构的振动控制中。