Establishment of a dynamic finite element model of an L-type pipeline system and optimization of hoop supporting position based on the genetic algorithm

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (16) : 149-157.

GAO Zhihui1,2,WANG Donghai1,2,SUN Wei1,2,WANG Bo1,2

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Abstract

In the stage of aero-engine pipeline design, optimizing the supporting position of the hoop can effectively avoid the excitation frequency of the rotor, so as to achieve the goal of reducing pipeline vibration. In this paper, taking the L-type pipeline as the object, the method of establishing the finite element model of the L-type pipeline and realizing the optimization of the hoop supporting position with the goal of avoiding vibration are studied. Firstly, the finite element modeling method of "simulating curved beam with straight beam" for L-type pipeline is proposed. On this basis, the dynamic finite element model of the pipeline system is established by using the springs to simulate the supporting effect of hoop. Then, taking the position of the hoop as the design variable and the difference between the excitation frequency and the first natural frequency of the pipeline as the objective function, an optimization model of the hoop supporting position is established to avoid vibration. Furthermore, the specific process of solving the optimization model based on genetic algorithm is described. Finally, an L-type pipeline with three hoops is taken as an example to verify the rationality of the proposed finite element modeling method. Furthermore, by performing optimization calculation, the optimal hoop position is determined to avoid vibration. At the same time, the "safe region" of hoop is analyzed, and the movable range of each hoop under the condition of vibration avoidance is determined.
Key words: L-type pipeline; finite element modeling; dynamics; genetic algorithm; optimization of hoop position.

Key words

L-type pipeline / finite element modeling / dynamics / genetic algorithm / optimization of hoop position.

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GAO Zhihui1,2,WANG Donghai1,2,SUN Wei1,2,WANG Bo1,2. Establishment of a dynamic finite element model of an L-type pipeline system and optimization of hoop supporting position based on the genetic algorithm[J]. Journal of Vibration and Shock, 2022, 41(16): 149-157

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