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

Abstract

The invention relates to a double-cycle forbidden band characteristic based low-frequency broadband vibration suppression structure and belongs to the field of mechanical vibration and noise control,in particular to the technical field of aviation, aerospace and ship vibration noise control. The vibration suppression structure is formed by combination of identical cell cycles, and each cell comprises a four-layer structure which is formed by a homogeneous attachment layer, a cycle sandwich layer, a homogeneous restraint layer and a homogeneous surface layer sequentially from bottom to top, the cycle sandwich layer of each single cell in the structure is composed of materials A and B, the center of each sandwich layer composed of the materials A and B is provided with a center, a local resonance unit is mounted in each through hole and formed by connection of an upper spring element, a lower spring element and a middle mass element, and every two corresponding upper and lower spring elements are connected with the corresponding lower homogeneous attachment layer and the corresponding upper homogeneous restraint layer. The cycle vibration suppression structure generates a vibrationsuppression effect in a low-frequency broadband range, and the problem of poor low-frequency vibration suppression effects of an existing vibration suppression technique can be solved beneficially.

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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