Modeling and dynamic characteristics analysis for a pipeline system with single double-clamp

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (19) : 114-120.

CHAI Qingdong1, FU Qiang1, MA Hui1, 2, HAN Qingkai1, 2, ZHANG Dazhi3

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Abstract

A double-clamp in aero-engine was taken as the study object and discretized equivalently into several linear springs. The stiffness testing device was used to obtain the double-clamp’s angular stiffness and parts of line stiffnesses. The dynamic model of a pipeline system with a double-clamp under the boundary condition of two fixed ends was established based on the theory of Timoshenko beam. The genetic algorithm (GA) combined with modal tests was adopted to search the double-clamp’s stiffnesses not being able to be measured by the stiffness testing device. It was shown that the error of the natural frequency between simulation and test is less than 4.46%; the frequency response functions of the two agree well with each other. Based on the obtained stiffnesses of the double-clamp, the dynamic model of a pipeline system with single double-clamp was established, and the hammer test was used to verify the effectiveness of the model. It was shown that the maximum error of the natural frequency between simulation and test is about 3.86%; modes simulated and those tested are consistent with each other; the established dynamic model here for pipeline systems with single double-clamp can be applied to analyze vibration characteristics of pipeline systems with clamps in engineering.

Key words

double-clamp / pipeline / testing / finite element / natural frequency / frequency response function

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CHAI Qingdong1, FU Qiang1, MA Hui1, 2, HAN Qingkai1, 2, ZHANG Dazhi3. Modeling and dynamic characteristics analysis for a pipeline system with single double-clamp[J]. Journal of Vibration and Shock, 2020, 39(19): 114-120

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