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Instability of mistuned tube-array structures with axial loads
Authors:Bo-Wun Huang  Pu-Ping Yu  Gong-Sheng Chen
Institution:1. Department of Mechanical Engineering, Cheng Shiu University, 840 Cheng Ching Rd. Niaosung, 833, Kaohsiung, Taiwan
Abstract:This study examined the instability of mistuned tube-array structures with axial loads. The tube-array structures were used to simulate a heat exchanger. In a heat exchanger, the tubes are frequently affected by hot and cold fluid shock waves. Therefore, the tubes often wear out. This wear may affect the dynamic properties of the tubes and introduce mode localization in the system. This study examined the instability caused by mode localization in a heat exchanger. A system consisting of periodic cooling tubes was used to simulate a coupled periodic structure system. Because each tube is coupled to the adjacent tube through the water, the system can be regarded as a weakly coupled system. The equations of the mistuned system with reference to the fluid effect can be derived using the Galerkin method. The numerical results indicated that the wear may introduce mode localization and instability into a mistuned heat exchanger with fluid.
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