Parallel mechanism based multidimensional vibration platform

Abstract

The invention discloses a parallel mechanism based multidimensional vibration platform. Standard zero stiffness of a vibration isolation platform at the equilibrium position and nonlinear stiffness nearby the equilibrium position can be realized by setting certain structural parameters, and the problem about difficulty in isolating low-frequency or ultra-low-frequency vibration for a traditional linear vibration isolation system; stiffness and damping can be easily and conveniently adjusted, vibration isolation of broad frequency domains are satisfied, and good engineering applicability is achieved; the multidimensional vibration platform is high in bearing stiffness, low in movement stiffness, small in static deflection, low in dynamic inherent frequency and good in vibration isolation effect; inherent contradictions restricting the traditional vibration isolation system, namely the contradictions of low-frequency vibration transmissibility and high-frequency vibration attenuation, can be solved by flexible adjustment of the stiffness and damping; the height and the static equilibrium position of the entire platform can be changed by adjusting a shock absorber spring base in height, and the multidimensional vibration platform is applicable to vibration isolation of objects of different weight.

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 multi-dimensional vibration reduction platform based on a parallel mechanism. 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 isolat...

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Problems solved by technology

But for the vertical vibration isolation system, reducing the stiffness will increase the static displacement and decrease the stability of the vibration isolation system; and 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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