基于实测冲击响应谱的飞机结构炮振响应预计与验证OA

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 appli-cations reveal substantial energy mismatch(amplitude differences exceeding fivefold)and failure in accurately evaluat-ing 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 can-not characterize the real shock pulse characteristics.Subsequently,a Shock Response Spectrum(SRS)was con-structed 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,pre-cisely replicates the dynamic characteristics of real gunfire environments.Combined with OPAX predictions,the ap-proach promotes the development of domestic engineering applications for gunfire vibration spectra and response esti-mation,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.