| PENG Gang, YU Nai-jiang, JIA Wen-qiang.Analysis of Structural and Dynamical Characteristic Parameters of External Pipes for Aeroengine[J].航空发动机,2017,43(5):1-6 |
| Analysis of Structural and Dynamical Characteristic Parameters of External Pipes for Aeroengine |
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| Key Words:external pipe, mode frequency, characteristic parameter, sensitivity, aeroengine |
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| Abstract:Aiming at the requirement of dynamical design for external pipes of aeroengine, the key design parameters and the
influence law were investigated through theoretical calculation and experimental tests. The results show that the external diameter, spacing
length and bending angle are the key structure and assembling parameters, which affect the natural vibration characteristics significantly.
The first mode frequency increases when the external diameter and bending angle increase, nevertheless, the first mode frequency decrease
when the spacing length increases. The bending radius, wall thickness and assembling lateral shift have a little effect on the natural
characteristics, which could be ignored during design.The natural frequency is slightly reduced when the pipes are filled with liquid, and the
greater the liquid density, the smaller the mode frequency. However, the pressure and velocity of the liquid affect the natural characteristics
barely, which could be ignored. |
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