Adaptive order tracking vibration reduction metamaterial shaft structure

Abstract

The invention discloses an adaptive order tracking vibration reduction metamaterial shaft structure, comprising a shaft base body, a shell and a unit cell unit. The unit cell unit comprises a constant-stiffness spring, mass blocks and variable-stiffness springs; the mass blocks are connected with the shaft base body and the shell through the constant-stiffness springs; and the adjacent mass blocks are connected through the variable-stiffness springs. The number of the mass blocks is eight; the mass blocks are annularly distributed on the periphery of the shaft base body; the number of the constant-stiffness springs is sixteen; and the number of the variable-stiffness springs is eight. The adaptive order tracking vibration reduction metamaterial shaft structure has the low-frequency vibration isolation capacity, the mass blocks with different thicknesses are designed in the circumferential direction of the shaft structure, a plurality of different band gaps are generated, and a wide low-frequency band gap is formed through combination. Adaptive order tracking can be achieved, the formed low-frequency forbidden band changes along with the change of the rotating speed, and the vibration and noise reduction effect is better.

Description

technical field [0001] The invention belongs to the cross technical field of vibration noise control and functional composite materials, and in particular relates to an adaptive order tracking vibration damping metamaterial shaft structure. Background technique [0002] For the NVH performance of rotating machinery, the torsional vibration of rotating components such as engine crankshafts and drive shafts has always been a concern. Torsional vibration will cause corresponding NVH and fatigue problems. For example, torsional vibration of a car will cause fatigue of teeth and tooth surfaces of some meshing gears, fatigue of elastic couplings, etc., causing vibration of steering wheel, seat, and pedals, thus causing vibration comfort question. Torsional vibration will also cause corresponding noise problems, such as engine start and stop noise, drive shaft resonance causing noise in the car, transmission gear meshing noise, etc. In addition to causing NVH and fatigue problems...

AI Technical Summary

Problems solved by technology

At present, the fixed-frequency torsional vibration damper is widely used in the domestic market, that is, the frequency of the torsional vibration that can be blocked by the vibration damper after the design is completed is determined and cannot be changed.

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