Vibration isolation structure based on bistable curved beams

Abstract

The invention discloses a vibration isolation structure based on bistable curved beams. A plurality of cell element structures are sequentially connected and regularly arranged in a plane or space to form the vibration isolation structure. Each cell element structure comprises a supporting rod, the bottom end of each supporting rod is connected with the top of the corresponding bistable curved beam, the two ends of each bistable curved beam are connected with the two ends of a connecting rod correspondingly, and a spring is connected between the top of each bistable curved beam and the corresponding connecting rod. The vibration isolation structure is simple in structure and easy to manufacture, the positive stiffness and the negative stiffness in a whole vibration isolation system are easy to adjust, then the force corresponding to a quasi-zero stiffness interval is adjusted so as to adapt to different loads, meanwhile, the minimum unit modular design can adapt to different structural environments, and the engineering requirements are met.

Description

technical field [0001] The invention belongs to the technical field of vibration isolation, and in particular relates to a vibration isolation structure based on a bistable curved beam. Background technique [0002] Since the current linear vibration isolation technology is relatively mature, the isolation of medium and high frequency vibrations has been well realized, but the isolation of low frequency and ultra-low frequency vibrations still faces challenges, and the harm of low frequency and ultra-low frequency vibrations to instruments and equipment is more significant. In order to expand the vibration isolation frequency band of the system to low frequency and ultra-low frequency, it is often necessary to reduce the stiffness of the system. Traditional passive vibration isolation is very difficult to implement due to its own characteristics, and it is difficult to balance the bearing capacity and stability. The quasi-zero-stiffness vibration isolator can make the vibra...

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Problems solved by technology

However, most of the methods for obtaining quasi-zero stiffness are based on the parallel structure of Euler beams and magnets, springs and magnets, which increases the weight of the vibration isolator to a large extent and makes the structure more complicated, and the quasi-zero stiffness based on magnets is generally very low. It is difficult to theoretically obtain the quasi-zero stiffness interval, let alone obtain a specific quasi-zero stiffness interval, and it is not very good to verify whether the proposed new structure can be applied to engineering structures, and the applicability is poor

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