A Dynamic Vibration Absorber for Rotor System Using Nonlinear Energy Sink Mechanism

Abstract

The invention discloses a rotor system dynamic vibration absorber utilizing a nonlinear energy well mechanism. The rotor system dynamic vibration absorber comprises a vibration absorber body and a supporting component fixing device; the vibration absorber body comprises a supporting component, a connection component and a vibration absorber mass block; the supporting component comprises a bearing,a support and a shaft sleeve; the connection component comprises nuts, connection rods and piecewise linear rods; the piecewise linear rods form a piecewise linear stiffness and fit nonlinear cubic stiffness; connection holes and interstitial holes are formed in the vibration absorber mass block to form matching with the connection component; the vibration absorber mass block is in clearance fitting to the piecewise linear rods to form the nonlinear energy well mechanism; and the supporting component fixing device comprises bolts, fixed frames, springs and connection sheets. The rotor systemdynamic vibration absorber utilizing the nonlinear energy well mechanism can effectively inhibit vibration of a rotor system broadband, belongs to the field of vibration noise control, is compact in whole structure, small in additional mass, high in reliability and convenient to use and does not need to provide energy by the external.

Description

technical field [0001] The invention relates to the technical field of vibration and noise control, in particular to a dynamic vibration absorber for a rotor system using a nonlinear energy sink mechanism, which is used for vibration suppression of the rotor system, a core component of a rotating machine. Background technique [0002] Vibration is a typical hazard for the safe operation of rotating machinery, and excessive vibration can cause serious damage to rotating machinery. Rotating machinery is often used as the core equipment in the national industrial field, and it often generates vibration due to unbalance and other reasons. Especially for multi-span rotors, its working speed is usually above the first-order critical speed, and it must pass through the critical speed during the start and stop stages. At this time Strong resonance will occur, seriously affecting the stable operation of the unit. With the continuous efforts of the "2025 Plan" of the national equipme...

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Problems solved by technology

[0004] At present, passive vibration absorbers are widely used in the field of vibration suppression of rotating machinery. Although they have the characteristics of simple structure and no energy source, their practical application is limited due to the narrow frequency band of vibration suppression; although active vibration absorbers It has the advantages of high control precision and sensitive response, but its structure is too complicated, which reduces its applicability

[0005] As mentioned earlier, passive vibration absorbers have a narrow frequency range for effective vibration suppression, while active or semi-active vibration absorbers have a rather complex structure

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