Ultrathin omni-directional vibration isolation metasurface structure and design method thereof

Abstract

The invention relates to the technical field of engineering structure vibration isolation, in particular to an ultrathin omni-directional vibration isolation metasurface structure and a design methodthereof. The omni-directional vibration isolation metasurface structure comprises a flat plate and a vibration isolation metasurface structure body arranged on the flat plate. The vibration isolationmetasurface structure is designed to be in any closed shape according to the shape and the position of a vibration source, the vibration isolation metasurface structure is composed of supercells arranged periodically, each supercell comprises j unit cells with gradient indexes, and the unit cells are in a sawtooth shape. By designing the elastic wave metasurface with the sub-wavelength thickness,complete reflection of elastic waves at any incident angle is achieved, so that the purpose of isolating vibration is achieved, and the metasurface has the advantages of being light and thin in structure, small in size, wide in working frequency range and capable of achieving 360-degree omni-directional vibration isolation.

Description

technical field [0001] The invention relates to the technical field of engineering structure vibration isolation, in particular to an ultra-thin omni-directional vibration isolation metasurface structure and a design method thereof. Background technique [0002] Vibration and noise problems are ubiquitous in engineering structures, especially in fields closely related to structural dynamics such as aerospace, marine vehicles, and civil engineering. On the one hand, severe vibration will cause fatigue to the driver and passengers and reduce ride comfort; on the other hand, it will seriously affect the dynamic mechanical properties of the structure, interfere with the sensitivity of electronic components, increase the instability of the structure, and even cause fatigue damage , leading to the failure of the overall performance of the structure. Therefore, how to effectively realize vibration isolation has always been one of the key issues in the field of vibration and noise ...

AI Technical Summary

Problems solved by technology

The active control strategy has the advantages of controllable bandwidth and adaptability to the environment, but the external energy input equipment required for active control is often bulky, complex in design, and low in system reliability, which seriously restricts its wider application.

Although the semi-active vibration isolation method combines the advantages of active and passive control, it still relies on sophisticated circuit system design, and the energy conversion efficiency and mass volume still need to be further improved and improved

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