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

Abstract

The invention discloses a quasi-zero-stiffness torsional vibration isolator with adjustable stiffness and a method thereof, which comprises an outer casing in which a positive stiffness element and a negative stiffness element are arranged; For the reed, the semicircle is provided with a protrusion, and the protrusion is arranged obliquely along the axial direction, and a gap is formed between the protrusions of the two semicircles for the reed to extend into; the negative stiffness element includes an outer magnetic ring and an inner magnetic ring, the outer magnetic ring and the inner magnetic ring. There is an air gap between the inner magnetic rings, the inner magnetic ring and the reed are fixedly connected with the stiffness adjustment mechanism, and the stiffness adjustment mechanism drives the inner magnetic ring and the reed to move axially to adjust the stiffness. The invention can adapt to different working loads and has good low-frequency vibration isolation performance.

Description

technical field [0001] The invention belongs to the technical field of torsional vibration isolation, and in particular relates to a quasi-zero-stiffness torsional vibration isolator and method with adjustable stiffness. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Rotating machinery is widely used in industries such as aerospace, process manufacturing, energy and transportation. As a common dynamic phenomenon in rotating mechanical systems, torsional vibration will interfere with mechanical equipment, which will not only affect the machining accuracy and work efficiency, but also increase the wear of internal precision parts and reduce the service life of mechanical equipment. At the same time, severe vibration will also bring noise problems. [0004] Vibration isolation techniques are often preferred when dealing with unwanted vibration prob...

AI Technical Summary

Problems solved by technology

Some scholars have proposed a quasi-zero-stiffness torsional vibration isolator with adjustable negative stiffness. This type of technology can only adjust the negative stiffness, but not the positive stiffness. It can improve the vibration isolation effect to a certain extent, but it is still only suitable for The fixed design load plays a better role in vibration isolation. Once the load changes greatly, this type of vibration isolator will greatly deviate from the quasi-zero stiffness state, which will affect the vibration isolation effect.

[0006] All in all, the existing vibration isolators can only isolate the load with a fixed or small variation range. When the load changes greatly, the stiffness cannot be adjusted, or the positive and negative stiffness cannot offset each other after adjusting the stiffness. If the quasi-zero stiffness state is reached, it will not be able to achieve a good vibration isolation effect.

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