Quick-response active control mechanism for rotor supporting rigidity

Abstract

The invention provides a quick-response active control mechanism for rotor supporting rigidity. The active control mechanism comprises an elastic supporting structure, a rotor bearing, an annular wedge block, an actuating mechanism, a plurality of connecting rods and return mechanisms, wherein the rotor bearing is supported on an inner rotary surface of the elastic supporting structure with an opening at one end; the annular wedge block is sleeved on the rotor bearing; one ends of the connecting rods are connected with the annular wedge block, and the other ends of the connecting rods are connected with the actuating mechanism; the actuating mechanism is used for enabling the annular wedge block to move in the axial direction and break away from the opening of the elastic supporting structure; and the return mechanisms are arranged on the connecting rods in a sleeving manner, and are used for embedding and stably keeping the annular wedge block at the opening of the elastic supportingstructure. According to the active control mechanism, the rigidity of the supporting structure at the rotor bearing is controlled, when the rotating speed of a rotor passes through the critical rotating speed, the supporting rigidity at the rotor fulcrum is rapidly controlled, the critical rotating speed is adjusted, and therefore short-time resonance generated when the rotating speed of the rotorpasses through the critical rotating speed and the problems of rotor rub-impact, fatigue cracks and the like caused by short-time resonance are effectively restrained.

Description

technical field [0001] The disclosure relates to the field of active control of vibration in rotor dynamics of aero-engines (or ground gas turbines), in particular to a fast-response active control mechanism for rotor support stiffness. Background technique [0002] Modern aeroengines (or ground gas turbines) require higher and higher rotor speeds to meet their thrust (or power) requirements, and their rotors are generally flexible rotors, that is, the rotor operating speed is higher than the low-order critical speed. Therefore, during the process of starting or stopping the rotor, the rotor speed must pass its critical speed, resulting in resonance of the rotor system, which threatens the safe and reliable operation of the engine. [0003] In traditional aero-engine rotor design, an elastic support structure is usually used to reduce the support stiffness at the fulcrum of the rotor bearing, change the critical speed of the rotor system, and achieve the purpose of not havin...

AI Technical Summary

Problems solved by technology

However, this technology needs to energize and heat the shape memory alloy wire, and the response time of the control system is long, which is not conducive to the rapid response requirement of the rotor support stiffness control

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