Analysis and test for fluid flow induced vibration of air conditioner pipes

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (1) : 261-267.

TAN Bohuan1, SHU Bao2, LI Dong2, LIU Xiaoqin1, WU Xing1

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Abstract

Pipes connecting compressor and heat exchange coils play an important role in noise and vibration control of air conditioners. The vibration of pipes caused by fluid flow was analyzed with fluid dynamics and structural dynamics. The accurate FE dynamic model of the pipe system was established and the correctness of the FE model was verified using modal analysis and tests. The pressures on the pipe surface were obtained with the fluid dynamic analysis. The excitations (the pressures) were combined with the FE model verified with tests to analyze harmonic vibration responses of the pipes. Then, the pipes operational deflection shapes (ODS) test was performed to verify the reliability and effectiveness of the analysis method for fluid flow induced vibration of pipes of air conditioner. The results showed that the results of the pipe systems theoretical modal analysis agree well with those of tests to ensure the correctness of the FE dynamic model and to lay a foundation for further analysis; the theoretical analysis results of the pipe system vibration agree better with the results of its ODS test in lower frequency range, but there are larger errors in higher frequency range. The reasons to cause errors were analyzed, they provided a reference for further study.

Key words

air conditioning / pipe vibration / modal analysis / flow excitation / ODS

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TAN Bohuan1, SHU Bao2, LI Dong2, LIU Xiaoqin1, WU Xing1. Analysis and test for fluid flow induced vibration of air conditioner pipes[J]. Journal of Vibration and Shock, 2017, 36(1): 261-267

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