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Study on Characteristics Noise Radiation of Civil Aircraft Engine
CHEN Ling;XIA Yu;JI Liang
   2012, 32 (4): 78-82.   DOI: 10.3969/j.issn.1006-1355.2012.04.018
Abstract （2285）            Save
In order to study the engine noise radiation characteristics of civil aircraft on the cruise state, a similar transformation law was used in which the engine state parameter measured on ground work was transfered to one of the flight state. Analyzing two known aircraft engines, the engine noise pressure level changes corresponding to the ground test state and the air cruise state were investigated with different speed and the radiation angle, and the noise radiation field change rule of these two kind of state was obtained.
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Study on Torsional and Bending Vibration of Rear-drive Transmission
XIA Yuan-feng;LI Hong-cheng;TANG Yu;TIAN Xiong;
   2011, 31 (5): 75-79.   DOI: 10.3969/j.issn.1006-1355-2011.05.018
Abstract （2212）            Save
A rigid-flexible coupling model for torsional vibration analysis of a rear-drive transmission system is established using multi-body dynamic theory. Natural frequencies and modes of the torsional vibration are calculated for each transmission gear of the transmission system. The system frequencies which influence the transmission rattle are analyzed and verified by NVH testing. The harmonic responses and forced vibration are analyzed and the results are verified by the system’s torsional vibration testing. ?The bending modes for the transfer shaft system are calculated by a modal synthesis method. The result is compared with that by finite element method, and both results are in good agreement. Finally, the influence of the stiffness of middle support on the first vibration mode of the transmission system is analyzed.
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