Acoustic index decomposition method of rail train body composite structure

Abstract

The invention discloses an acoustic index decomposition method of a rail train body composite structure, which is combined with a multi-objective optimization design method and considers the coupling action relationship of an aluminum profile, a porous sound absorption material and an interior trimming panel. Acoustic indexes of the vehicle body composite structure are decomposed from the vehicle body composite structure to single-layer or single structures / materials such as aluminum profiles, porous sound absorption materials and layered interior trim panels, specific technical parameter requirements in the aspect of acoustics can be directly proposed in the material purchasing stage, management is facilitated, and noise control in the low-noise design process is better facilitated.

Description

technical field [0001] The invention relates to the technical field of rail vehicle noise control, in particular to an acoustic index decomposition method of a rail vehicle body composite structure. Background technique [0002] Rail transit is the lifeblood of my country's national economy, and the core technology is safety, comfort, greenness and intelligence, of which noise and vibration (acoustic vibration) are crucial to safety, comfort and greenness. The body structure of rail trains is an important path for the introduction of external noise into the vehicle, and its acoustic performance directly affects the noise level inside the vehicle. Therefore, in the low-noise design stage of rail trains, the total noise design objective is usually decomposed into the car body structure in different regions to constrain the acoustic performance of the car body structure, so as to ensure the vibration reduction and noise reduction control of rail trains in the design stage. The...

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Problems solved by technology

[0003] The prior art patent publication number is CN107862141A, and the patent name is a low-noise forward design method for rail vehicles. When decomposing the acoustic index of vehicle noise, the overall acoustic performance of the composite structure of the car body is considered, but the structure of individual components is not considered. Effects of Acoustic Performance Variations on Acoustic Performance of Vehicle Body Composite Structure

And other existing acoustic index decomposition methods mainly decompose the noise inside the car to the composite structure of the car body, but how to reprocess the acoustic index from the composite structure of the car body to further decompose into such as aluminum profiles, porous sound-absorbing materials and layered interior Single-layer or individual structures / materials such as veneers, lack of research

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