A Low-frequency and Wide-frequency Vibration Suppression Structure Based on Double-period Bandgap Characteristics

Abstract

The invention relates to a low-frequency broadband vibration suppression structure based on double-period forbidden band characteristics, which belongs to the field of mechanical vibration and noise control, especially the technical field of aviation, aerospace and ship vibration and noise control. The vibration suppression structure is composed of periodic composites of the same cells, in which a single cell contains a four-layer structure, from bottom to top, a homogeneous attachment layer, a periodic sandwich layer, a homogeneous constraint layer and a homogeneous surface layer. The periodic sandwich layer of a single cell of the structure is composed of two materials, A and B. Through holes are respectively opened in the centers of the sandwich layers composed of A material and B material, and a local resonance is installed in each through hole. The unit and local resonance unit are composed of two upper and lower spring elements connected to a mass element in the middle. The two spring elements are respectively connected to the homogeneous attachment layer on the lower side and the homogeneous constraint layer on the upper side. The periodic vibration suppression structure provided by the present invention can produce a vibration suppression effect in a low frequency and wide frequency range, and helps to solve the problem of poor low frequency vibration suppression effect of existing vibration suppression technology.

Description

technical field [0001] The invention relates to a low-frequency and wide-frequency vibration suppression structure based on double-period bandgap characteristics, belonging to the field of mechanical vibration and noise control, in particular to the technical field of aviation, aerospace and ship vibration and noise control. Background technique [0002] It is a common physical phenomenon that mechanical structures vibrate when excited. While vibrations can be used by humans and bring economic benefits, in many cases vibrations can cause serious harm. In the field of aviation, reducing the vibration of the structure and thus reducing the noise in the cabin can improve the comfort of passengers. In the field of aerospace, the huge external load of a rocket or missile when it is launched or working will cause strong vibration of the structure. Effectively reducing structural vibration can improve the working safety of the rocket and the guidance accuracy of the missile. In a...

AI Technical Summary

Problems solved by technology

However, the traditional vibration control technology is not effective in suppressing vibration at low frequencies.

Although active vibration suppression technology can solve the problem of low-frequency line-spectrum vibration control to a certain extent, it is currently powerless to deal with low-frequency and broadband vibrations.

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