Automotive acoustic superstructure for low-frequency broadband vibration reduction

Abstract

The invention discloses an automotive acoustic superstructure for low-frequency broadband vibration reduction. The superstructure comprises at least two superstructure base plates; each superstructure base plate comprises at least one unit cell unit; each unit cell unit comprises a unit cell frame, a first mounting plate, a second mounting plate and a mass block body, the first mounting plate and the second mounting plate are respectively arranged at the left part and the right part of the unit cell frame from left to right, and the mass block body is detachably fixed to the first mounting plate and the second mounting plate. The automotive acoustic superstructure for low-frequency broadband vibration reduction is simple in structure, the band gap frequency range of the acoustic superstructure is widened, the total elastic wave energy dissipation amount of superstructure unit cells is greatly increased, it is guaranteed that vibration elastic waves transmitted from all directions can be well restrained, and the automotive acoustic superstructure is high in applicability and wide in application field.

Description

technical field [0001] The invention relates to the technical field of automobile vibration reduction, in particular to a vehicle acoustic superstructure for low-frequency broadband vibration reduction. Background technique [0002] The formation and propagation of automobile noise and vibration have the characteristics of extensiveness, complexity, and weak correlation. According to their propagation channels, they are generally divided into airborne sound and structural sound. Airborne sound is directly transmitted to the passenger compartment by engine noise, external noise, etc. through body panels, doors, windows, etc., and its components are mainly medium and high frequency noise. For the medium and high frequency air noise in the car, the noise reduction measure widely used at home and abroad is to carry out acoustic packaging treatment. At present, the processing technology for this kind of air noise problem has been relatively mature and has achieved a relatively id...

AI Technical Summary

Problems solved by technology

[0005]1. Use traditional damping and vibration damping materials or rubber vibration damping materials, but theoretical and experimental studies have shown that this method has a more obvious attenuation of high-frequency vibrations, while in The effect of the low frequency band is not good, especially the vibration in the frequency range of 20-100Hz has almost no effect;

[0006]2. Add ribs or ribs to the thin-walled parts of the car body that contribute greatly to the noise inside the car, and increase its natural frequency in the low frequency band by increasing the local stiffness , but in actual operation, the frequency increase range is limited, and a large change in the structure of the panel parts will increase the production cost sharply, seriously affecting the economic benefits of the enterprise;

[0007]3. Install a dynamic vibration absorber, but its operating frequency band is narrow, and there are many restrictions in terms of installation space, light weight, durability and cost control

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