Positive and negative stiffness parallel-connection low-frequency vibration isolation device of coupling dynamic vibration absorber

Abstract

The invention discloses a positive and negative stiffness parallel-connection low-frequency vibration isolation device of a coupling dynamic vibration absorber. A cam-ball-spring mechanism symmetry arrangement is taken as a negative stiffness mechanism, the negative stiffness mechanism is in parallel connection with a positive stiffness spring to form a quasi-zero stiffness vibration isolator, andon this basis, a dynamic vibration absorber is additionally arranged to form a positive and negative stiffness parallel-connection vibration isolation system of a coupling linear vibration absorber;based on the anti-resonance characteristic in a multi-degree-of-freedom system, the additional dynamic vibration absorber is used for absorbing the vibration energy of a main system, so that the vibration energy is transferred to the dynamic vibration absorber to weaken the vibration intensity of a main structure; when the exciting force frequency is close to the inherent frequency of the dynamicvibration absorber, the power provided by the dynamic vibration absorber to the main system gradually offsets the exciting force acting on the main system, so that the amplitude of the main system canbe reduced sharply; and the vibration absorber with proper quality, stiffness and damping is selected, so that the force transmission rate curve can be moved leftwards, the initial vibration isolation frequency is reduced, the vibration isolation frequency bandwidth is expanded, and the low-frequency vibration isolation performance of the system is improved. The vibration isolation device has high static stiffness and low dynamic stiffness, has wide vibration isolation bandwidth and can be popularized and applied to low-frequency vibration control.

Description

technical field [0001] The invention relates to a positive and negative stiffness parallel low-frequency vibration isolation device coupled with a dynamic vibration absorber. The invention has a good low-frequency vibration isolation effect on equipment subjected to force, displacement and other excitations, and can be widely used in vehicle suspensions, bridges, In the low-frequency vibration control of ships, precision measuring instruments, medical and other fields. Background technique [0002] Vibration is ubiquitous in engineering production. In most cases, vibration is harmful and will cause certain harm and inconvenience to production activities, scientific research and daily life. In the field of manufacturing and processing, vibration will affect the working life of mechanical equipment and reduce the stability of mechanical equipment operation; in the field of automobiles, it will affect the working efficiency of engines and suspensions, etc., and reduce the comfo...

AI Technical Summary

Problems solved by technology

However, reducing the stiffness of the system or increasing the mass of the vibration-isolated body will affect the bearing capacity of the system, causing problems such as excessive static deformation and instability.

The quasi-zero stiffness vibration isolator is composed of positive and negative stiffness structures connected in parallel. Positive stiffness can ensure that the system has sufficient bearing capacity, and negative stiffness can reduce the total stiffness of the system, making the system have high static stiffness and low dynamic stiffness, but sometimes it cannot To achieve the desired vibration isolation effect

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