An acoustic metamaterial suspension vibration isolation structure

Abstract

The invention discloses an acoustic metamaterial suspension vibration isolation structure. The suspension vibration isolation structure is formed by folding an elastic film and two wrapping layers arranged on the upper and lower sides of the elastic film in a bow shape. There are periodic openings, and a mass block is arranged on the elastic film at each opening. The acoustic metamaterial suspension vibration isolation structure provided by the present invention has both multi-layer damping and vibration reduction and acoustic metamaterial vibration isolation functions, and has outstanding advantages such as strong low-frequency vibration attenuation ability and easy frequency selective attenuation. The bow-shaped folded plate structure can meet a wide range of suspension stiffness design requirements, and there is no high-frequency hardening problem. On the whole, the structure is simple, the design is good, and the basic materials used are all conventional materials, which are easy to process and produce in batches, and are worthy of promotion in the industry.

Description

technical field [0001] The invention belongs to the cross technical field of vibration noise control and functional composite materials, and in particular relates to an acoustic metamaterial suspension vibration isolation structure. Background technique [0002] Since the 20th century, with the continuous improvement of people's requirements for the comfort of transportation equipment and the service life of production equipment, mounts have been widely used in automobiles, trains, aircraft, ships, construction machinery, machine tools and other equipment. For example, in automobiles, the most commonly used types of mounts are engine mounts and body mounts. The engine is one of the main vibration excitation sources of the car. On the one hand, a good engine mount can attenuate the vibration energy of the engine transmitted to the frame. On the one hand, it can also protect the engine; the body suspension can isolate the transmission of chassis vibration to the interior of th...

AI Technical Summary

Problems solved by technology

Regardless of the specific type, its working principle is purely based on the "mass-spring-damper" model of the classical vibration theory, and there are many restrictions on the mass distribution, spatial arrangement and motion relationship in the actual mechanical equipment, which restricts the suspension Reasonable setting of the frequency band for the effective function of the unit

Specifically, it is difficult to balance the vibration isolation capabilities of high and low frequency bands, and at the same time, it is difficult to achieve selective attenuation of resonance peaks, which cannot meet the increasingly stringent requirements of users for acoustic and vibration comfort.

It can be seen that the transmission suspension unit will eventually be unable to meet the technical requirements of mechanical equipment, and it is imperative to break through the traditional working principle and implement innovations.

Images