A torsional quasi-zero stiffness vibration isolator with adjustable negative stiffness and its control method

Abstract

The invention provides a negative-stiffness-adjustable torsional quasi-zero stiffness vibration isolator and a control method. The negative-stiffness-adjustable torsional quasi-zero stiffness vibration isolator comprises a front shell, a rear shell, a front washer, a rear washer, a rotary sleeve used for fixing a transmission shaft, and a permanent magnet excitation mechanism. A rotary component of the permanent magnet excitation mechanism is fixedly connected with the rotary sleeve and is fixedly connected with a permanent magnet through a rubber pad. A magnetic flux generated by the permanent magnet passes through the rubber pad, the rotary component, an air gap and an annular permanent magnet clamping mechanism to return to the permanent magnet to form a magnetic flux loop, and the magnetic stress is generated in the air gap and is applied to the rotary component, so that a torsional magnetic spring is formed by the rotary component in the thickness direction of the air gap. The magnetic field intensity in the air gap is changed by adjusting the intensity of current supplied to an exciting coil, and then the negative stiffness of the magnetic spring is changed to be close to thepositive stiffness achieved through a rubber bearing, so that the system stiffness is made to the quasi-zero state. The negative-stiffness-adjustable torsional quasi-zero stiffness vibration isolatorcan effectively transmit the driving torque and can isolate the disturbance torque; the system stiffness is actively controlled, so that low-frequency torsional vibration is well isolated; and the negative-stiffness-adjustable torsional quasi-zero stiffness vibration isolator is suitable for a precision rotating system.

Description

technical field [0001] The invention relates to the technical field of torsional vibration isolation, in particular to a torsional quasi-zero-stiffness vibration isolator with adjustable negative stiffness and a control method. Background technique [0002] Rotating machinery is widely used in aerospace, machining and manufacturing, energy and rail transportation and other fields. Torsional vibration is a ubiquitous dynamic phenomenon in rotating mechanical systems, which will destroy the smooth operation of mechanical equipment and even cause serious consequences such as damage to related components. For precision engineering fields, such as spacecraft systems, torsional vibration will affect the accuracy of precision instruments, and severe torsional vibration will also cause noise problems. At present, the quasi-zero stiffness vibration isolators used for torsional vibration are generally less, and the structure is complex, the size is large, it is difficult to miniaturi...

AI Technical Summary

Problems solved by technology

At present, the quasi-zero stiffness vibration isolators used for torsional vibration are generally less, and the structure is complex, the size is large, it is difficult to miniaturize and precision, most of them are passive, and the controllability is poor

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