Damping force-controllable dry friction damping bearing

Abstract

The invention provides a damping force-controllable dry friction damping bearing. The bearing comprises a bearing body and a bearing pedestal, wherein the bearing body comprises bearing covers, a universal sliding bearing and a sliding assembly, and the sliding assembly comprises a sliding head, a piezoelectric ceramic component, a force sensor, a backing plate, a prepressing bolt and a side-face end cover; the bearing body is provided with two same bearing covers which are matched with each other, the interior of each bearing cover is hollow, and the inner surface of each hollow part is an inner spherical surface; the universal sliding bearing is installed at the hollow parts of the bearing covers, and the other surface of the universal sliding bearing is matched with the inner surfaces of the hollow parts; the universal sliding bearing is provided with an internal shaft hole, a sliding bearing bushing is inlaid in the internal shaft hole, and a rotating shaft is arranged in the sliding bearing bushing; and a rectangular groove is formed in the inner wall of each bearing cover, and the sliding assembly is installed in the rectangular grooves. According to the damping force-controllable dry friction damping bearing, restraint of the bearing on the deflection tendency of the rotating shaft is released, steering is flexible, external transfer force of the bearing is small, controllable friction damping force can be generated, accuracy control over deflection of the rotating shaft can be achieved, vibration energy is consumed, and low-speed stability of a system is further improved.

Description

technical field [0001] The invention relates to the field of bearings, in particular to a dry friction damping bearing with controllable damping force. Background technique [0002] With the rapid development of modern industrial technology, in order to reduce the weight of the high-speed rotor system, the flexible rotor system is often used. The critical speed is low, and the working speed is often above the first and second critical speeds. 1. During the deceleration process, the critical speed must be passed. At this time, the rotor system will resonate and produce severe harmful vibration. Therefore, necessary measures must be taken to suppress the resonance of the rotor passing through the critical speed. Since there is a "damping control zone" near the resonance frequency, introducing damping at the support is a feasible vibration control method. [0003] Squeeze oil film damping bearings have been applied in aero-engines due to their remarkable damping effect, simpl...

AI Technical Summary

Problems solved by technology

Although the extrusion oil film damping bearing in the above literature has a significant damping effect, if the design and manufacturing accuracy is not good or the rotor system unbalance deteriorates, the nonlinearity of the oil film will increase greatly, resulting in many harmful nonlinear responses

Due to the uncontrollable oil film damping force, the effect of oil film damping and vibration reduction is not good, and the oil film damping method has poor stability when the rotor is running at low speed, and it is not suitable for the static load condition of the rotor.

Images