Analysis of the Influence of Damping Treatment on Sound Insulation Characteristics of Aluminum Extruded Structures

doi:10.3901/JME.2024.18.299

Abstract

Abstract: As a good noise and vibration reduction material, water-based damping coating is widely used in high-speed train car body structures. At the scheme design stage of low-noise design of high-speed trains, it is not easy to compare the effects of various damping treatments due to test limitations. The damping loss factor of aluminum extruded structures with damping treatment was calculated based on the complex eigenvalue method. Then, a sound insulation characteristics prediction model of the structure was established based on the hybrid finite element-statistical energy analysis method. The influence of the damping treatment on the sound insulation characteristics of the structure was analyzed. The results show that the influence of damping treatment on the sound insulation characteristics of aluminum extruded structures can be divided into “mass-stiffness effect” and “damping effect”. The “mass-stiffness effect” changes the modal properties of the structures, resulting in a reduction of natural frequency and an offset of sound transmission loss valley to lower frequency. The “damping effect” increases the damping loss factor of the structures, resulting in the increase of sound transmission loss valley. When a 3 mm damping material treating on the bottom layer of aluminum extruded structures, the frequency dependent sound transmission loss is mainly dominated by “mass-stiffness effect” in the 1/3 octave frequency band of 100-400 Hz. And the “damping effect” begins to increase significantly with the increase of frequency above 500 Hz, the sound transmission loss is affected by both the “mass-stiffness effect” and the “damping effect”. When the thickness of the damping layer is small, the increase of the sound transmission loss above 500 Hz is mainly caused by the “damping effect”, with the increase of the damping layer’s thickness, the increase of the “mass-stiffness effect” is more obvious than the “damping effect”. When the damping material is treated on the thinner layer of the aluminum extruded structures, the sound insulation performance is better.

Key words: high-speed train car body, aluminum extruded structures, the hybrid FE-SEA method, complex eigenvalue method, damping treatment, sound insulation characteristic

CLC Number:

U270

YAO Dan, ZHANG Jie, WANG Ruiqian, XIAO Xinbiao. Analysis of the Influence of Damping Treatment on Sound Insulation Characteristics of Aluminum Extruded Structures[J]. Journal of Mechanical Engineering, 2024, 60(18): 299-309.

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