| Citation: | LI Jishi, WANG Xin, ZHANG Dayi, et al. Sine-on-random vibration profile for vibration environment test of external accessories[J]. Journal of Aerospace Power, 2025, 40（8）：20230747 doi: 10.13224/j.cnki.jasp.20230747
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To conduct the vibration environment test of external accessories on aeroengine effectively, a development method of vibration environment test profile was studied. By processing the measured data of the vibration environment of the engine external accessories, it was confirmed that the vibration environment was a mixture of sinusoidal and random excitations, and sinusoidal excitations exhibited order characteristics. A multi-components swept sine-on-random (SoR) vibration profile was developed to accurately capture the real vibration environment. A development process of swept SoR vibration profile using vibration field measurement data was established. Based on the fatigue damage equivalent theory, the multi swept sine components and random components were matched and synthesised during the development process. Four example profiles were developed for different areas on the casing. The result showed that the SoR profile can fully characterize the mixed excitation characteristics of real environmental loads compared with the single component profile. Compared with the profile specified in current standards/specifications, the frequency domain characteristics of the new developed profile were consistent with the real environmental loads, and the vibration level was strictly equal to the statistical tolerance of the real loads.
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