The metal buffer damper is just a component, and the damping effect is different when used in different places or different working environments. Shock absorber: Used for shock absorption, shock absorber is used for shock prevention, allowing low speed movement, when the speed or acceleration exceeds the corresponding value, locking, forming a rigid support.

Metal buffer dampers include: spring dampers, hydraulic dampers, pulse dampers, rotary dampers, wind dampers, viscous dampers, shock hinges, shock rails, furniture hardware, cabinet hardware.

The vibration of high-speed rotating machinery is a prominent and difficult to solve the problem, this kind of machine speed is high, are at the critical speed or even several critical speed above the operation. Therefore, in order to ensure its safe operation, in addition to carefully designed and precisely manufactured installation, dampers are usually used to reduce vibration. Extruded oil film dampers and electromagnetic dampers, dampers are two commonly used dampers.

The structure and working principles of a controlled passive building electromagnetic damper are similar in structure to an extruded oil film damper: the rotor (1 of the rotating machine) is supported by a rolling bearing (2) or a plain bearing on an iron core (3). The core is then supported on the seat (5) by a spring (4). The support stiffness of the spring can be designed according to the requirements of use, and it is the main stiffness of the support system. Around the core (6) are four concentric electromagnets. The DC magnet excitation voltage of the same size is applied to each magnet coil.

The additional stiffness and damping generated by the controllable passive electromagnetic damping device vary with frequency. It can be seen that the value of the additional stiffness is negative in the whole frequency range, and the negative stiffness value decreases with the increase of frequency. In the high frequency region, the stiffness value is almost zero. This damping characteristic is just in line with the characteristics of low frequency large damping and high frequency small damping required by rotating machinery. After determining the size of the controllable passive electromagnetic damping device, the stiffness and damping value only depend on the static excitation current or excitation voltage. The stiffness and damping can be changed by changing the excitation voltage, so that the damper is controllable.

One end of the slender shaft is supported on a traditional rigid ball bearing, the other end is supported on an electromagnetic damping bearing, and the rotor is driven by a DC motor. The vibration and rotational speed of the shaft are detected by eddy current sensor and photoelectric sensor respectively. The computer collects the vibration signal and speed signal through the advertising plate, which is the plate radial spring that provides the main support stiffness. The spring is made of elastic aluminum and wire cut. Stiffness is calculated and optimized by finite element analysis, with two springs placed side by side in an electromagnetic damped bearing to ensure symmetry and facilitate system modeling.

Metal buffer damper rotor system adopts passive electromagnetic damping device, and obtains good damping effect. The damping mechanism of the damper is passive, and the damping can be controlled by the excitation voltage. Compared with extruded oil film dampers, passive electromagnetic damping devices have the advantages of electromagnetic bearings compared with ordinary bearings. Compared with active electromagnetic damping devices, passive electromagnetic damping devices have the advantages of simple structure, low cost and high reliability.