| FANG Jian-feng.Aeroengine Vibration Environment Spectrum Statistical Induction and Reproduction on Vibration Testing Table[J].航空发动机,2024,50(2):159-163 |
| Aeroengine Vibration Environment Spectrum Statistical Induction and Reproduction on Vibration Testing Table |
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| Key Words:vibration data statistical induction environment spectrum vibration testing table reproduction aeroengine |
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| Abstract:To meet the requirements of conducting vibration assessment tests under conditions close to the operating environment for
the development of aeroengine and airborne products, it is necessary to provide the input spectrum required for the vibration assessment
test based on the measured engine vibration data. Based on the induction method of environment measurement data provided in GJB/Z 126-
99, a statistical induction method for vibration environment spectra measured engine vibration data was established and implemented
through a program. The measured vibration spectra at engine measuring positions were obtained by statistical induction according to vibra?
tion data from multiple actual test flights. Based on the principle of energy equivalence and consistent distribution of signal frequency
domain characteristics, the spectra obtained using the induction method were converted into vibration environment spectra which can be
used as the input for the vibration testing tables, and experiments for vibration signal reproduction were conducted on vibration testing
tables. The results show that the frequency domain distribution characteristics of the output signal of the vibration testing table are
consistent with that of the measured engine vibration signal. The maximum difference in the overall vibration within the statistical
frequency bandwidth is 5.7%, which proves the rationality of the conversion method and the capability of providing real input spectra for
vibration assessment tests of aeroengine airborne equipment under conditions close to the service environment. |
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