Analysis on the Effect of Constrained Damping Layout Area on Vibration and Noise Reduction of Aircraft Skin

HAO Min; GUO Ruiyi; TU Chunchao

doi:10.7643/issn.1672-9242.2026.10.012

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (10) : 106-112. DOI: 10.7643/issn.1672-9242.2026.10.012

Aviation and Aerospace Equipment

Analysis on the Effect of Constrained Damping Layout Area on Vibration and Noise Reduction of Aircraft Skin

HAO Min^1,2, GUO Ruiyi^1,2, TU Chunchao^1,2

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Abstract

The work aims to take a substrate as the research object and investigate the vibration and noise reduction effects of applying constrained layer damping (CLD) over different areas on the substrate. Impedance tube tests, modal tests and sound insulation lab tests were adopted. The impedance tube results showed that as the CLD coverage area increased, resonance peaks were eliminated and sound transmission loss improved. Modal test results showed that larger coverage areas led to a reduction in the number of modal orders, an increase in modal damping and enhanced vibration reduction efficiency. Sound insulation lab results demonstrated that applying CLD to typical skin components yielded noise reduction effect. When the CLD coverage area reached 56.25%, the noise reduction effect was equivalent to that of 75% coverage. When the CLD coverage area exceeds 50%, it meets functional requirements while avoiding a significant increase in added mass, thereby satisfying the dual demands of civil aircraft for practical performance and weight reduction.

Key words

constrained damping / transfer function / vibration reduction efficiency / sound insulation / impedance tube / modal

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HAO Min, GUO Ruiyi, TU Chunchao. Analysis on the Effect of Constrained Damping Layout Area on Vibration and Noise Reduction of Aircraft Skin[J]. Equipment Environmental Engineering. 2026, 23(10): 106-112 https://doi.org/10.7643/issn.1672-9242.2026.10.012

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