Prediction and validation of aircraft structure response to gunfire vibration based on measured shock response spectrum

Yixuan LI; Yinghua CHEN; Kaixiang LI; Chunyu BAI; Xiaochuan LIU

doi:10.7527/S1000-6893.2025.32327

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2026 , Vol. 47 >Issue 4: 232327 - 232327

DOI: https://doi.org/10.7527/S1000-6893.2025.32327

Solid Mechanics and Vehicle Conceptual Design

Prediction and validation of aircraft structure response to gunfire vibration based on measured shock response spectrum

Yixuan LI ,
Yinghua CHEN ,
Kaixiang LI ,
Chunyu BAI ,
Xiaochuan LIU

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^1.Aviation Acoustic and Vibration Aviation Science and Technology Key Laboratory，Aircraft Strength Research Institute of China，Xi’an 710065，China
^2.National Key Laboratory of Strength and Structural Integrity，Aircraft Strength Research Institute of China，Xi’an 710065，China
^3.China Helicopter Design and Research Institute，Jingdezhen 333001，China

E-mail：liyixuan0430@126.com

Received date: 2025-05-30

Revised date: 2025-07-16

Accepted date: 2025-07-28

Online published: 2025-08-11

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Abstract

The widely adopted Program IV general spectrum in China’ s military aircraft gunfire environment screening tests has been found to exhibit significant discrepancies with real-world gunfire vibration environments. Practical applications reveal substantial energy mismatch （amplitude differences exceeding fivefold） and failure in accurately evaluating structural cumulative damage. To address these issues， this study conducted gunfire vibration measurements on an aircraft equipment cabin. The results demonstrate that the traditional random-vibration-based general spectrum cannot characterize the real shock pulse characteristics. Subsequently， a Shock Response Spectrum （SRS） was constructed based on measured data. The Operational Path Analysis with eXogenous inputs （OPAX） method was further applied to predict responses in high-impact zones where direct measurement is restricted. Finite element simulations and laboratory experiments were employed to validate the SRS method. The findings reveal that the SRS-derived waveform exhibited high consistency with measured data in terms of pulse morphology and amplitude trends （energy matching error <15%）； the SRS strain responses effectively enveloped the full range of transient shock test results. This study further shows that SRS， by integrating multi-pulse energy statistics with structural dynamics coupling， precisely replicates the dynamic characteristics of real gunfire environments. Combined with OPAX predictions， the approach promotes the development of domestic engineering applications for gunfire vibration spectra and response estimation， and provides a scientific， standardized testing methodology for evaluating the reliability of aircraft structures and airborne equipment. The proposed approach significantly enhances the precision and practicality of environmental adaptability verification for defense systems.

Key words： gunfire vibration environment testing; gunfire vibration general spectrum; Shock Response Spectrum (SRS); measured data modeling; OPAX-based response prediction

Cite this article

Yixuan LI , Yinghua CHEN , Kaixiang LI , Chunyu BAI , Xiaochuan LIU . Prediction and validation of aircraft structure response to gunfire vibration based on measured shock response spectrum[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2026 , 47(4) : 232327 -232327 . DOI: 10.7527/S1000-6893.2025.32327

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