Six-degree-of-freedom parallel mechanism vibration attenuation platform

Abstract

The invention discloses a six-degree-of-freedom parallel mechanism vibration attenuation platform. By setting a given structural parameter, the quasi-rigidness of the vibration isolation platform on a balance position and the nonlinear rigidness of the vibration isolation platform near the balance position can be realized, and the difficulty when the traditional linear vibration isolation system isolates the low-frequency or ultralow-frequency vibration can be solved; the rigidness and damping can be simply adjusted, the six-degree-of-freedom parallel mechanism vibration attenuation platform is suitable for the broadband-frequency vibration isolation and has good engineering applicability; while the supporting rigidness is high, the motion rigidness is low, the static deformation is small, the dynamic intrinsic frequency is low, and the vibration isolation effect is good; by flexibly adjusting the rigidness and damping, the intrinsic contradiction, i.e. the contradiction between the low-frequency vibration transfer rate and high-frequency vibration attenuation rate, for restricting the traditional vibration isolation system can be solved.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering, relates to vibration reduction and vibration isolation technology in mechanical engineering, and in particular to a six-degree-of-freedom parallel mechanism vibration reduction platform. Background technique [0002] In order to overcome the contradiction between system stiffness and static displacement, the vibration isolation system should have high static stiffness and low dynamic stiffness at the same time. Higher static stiffness ensures greater bearing capacity of the system and smaller static displacement; lower dynamic stiffness ensures lower natural frequency of the system and better low-frequency vibration isolation effect. In traditional passive vibration isolation systems, the external excitation frequency is greater than the natural frequency of the vibration isolation system itself. times, in order to play a role in vibration isolation. This vibration isolation sys...

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Problems solved by technology

This vibration isolation system can better isolate the excitation frequency greater than times the natural frequency of the system, but the isolated excitation frequency is less than The ability to vibrate at low frequencies twice the natural frequency of the system, especially ultra-low frequency vibrations is poor

In order to improve the ability of the passive vibration isolation system to isolate low-frequency and ultra-low-frequency vibrations, the natural frequency of the vibration isolation system should be reduced. There are usually two methods: one is to reduce the stiffness of the vibration isolation system; the other is to increase the counterweight, but for vertical isolation Vibration system, reducing the stiffness will increase the static displacement and decrease the stability of the vibration isolation system; increasing the counterweight is obviously the last choice, and it is only used as a last resort, and the application is limited

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