Dynamic Modeling and Stress Reduction Optimization of Series Pipelines Based on Pipe-Solid Element Coupling

doi:10.12068/j.issn.1005-3026.2024.09.008

Abstract

Abstract:

To handle the urgent need for vibration reduction of spatial series pipelines， a finite element modeling method for spatial series pipelines based on pipe?solid elements coupling was proposed， and on this basis， the clamp layout optimization with the goal of reducing stress response was performed. The modeling concept is described in detail， that is， the regions with high stress， such as clamps and pipe joints， are modeled by solid elements， the other regions are modeled by pipe elements， and finally the parts are coupled together to complete the overall modeling. A specific optimization model is created， and the process of optimization using the genetic algorithm is given. A typical series pipeline is taken as the object for a case study， and the rationality of the model is verified by simulation and experiment. Stress reduction optimization is performed， the optimal clamp layout of the system is obtained， and the maximum resonance stress of the optimized system fundamental frequency was reduced by 27.05% compared with the initial state.

Key words: pipe?solid element coupling, series pipeline, dynamic modeling, stress reduction, optimization

CLC Number:

TB 535

Fang-ming LIU, Wei SUN. Dynamic Modeling and Stress Reduction Optimization of Series Pipelines Based on Pipe-Solid Element Coupling[J]. Journal of Northeastern University(Natural Science), 2024, 45(9): 1277-1286.

Figures/Tables 18

Fig.1 Typical spatial series pipeline

Fig.2 Stress response contour of pipeline under simple harmonic excitation

Fig.3 Schematic diagram of the dynamic modeling concept of the series pipeline based on pipe?solid element coupling

Fig.4 Section view of the mechanical structure of a typical pipe joint

Fig.5 Simplified diagram of the pipe joint

Fig.6 Structural diagram of the metal felt clamp

Fig.7 Finite element model of the clamp

Fig.8 Node coupling of the solid element and the pipe element

Fig.9 Schematic diagram of the optimization model of the series pipeline

Fig.10 Spatial series pipeline structure supported by multiple clamps

Table 1 Material parameters of each component

构件	弹性模量/GPa	密度/（kg?m^-3）	泊松比
管路	204	7 800	0.285
管接头	204	7 800	0.285
卡箍箍带	240	7 800	0.285
金属毡	0.6	7 800	0.285
螺栓	210	7 800	0.285

Fig.11 Vibration test system of the pipeline system

Table 2 Modal damping ratio

模态阻尼比阶次	1	2	3
模态阻尼比数值	0.021	0.013	0.010

Fig.12 Finite element model of series pipeline

Fig.13 Comparison of the stress response at the strain gauge point 1 position with the simulation

Fig.14 Comparison of the stress response at the strain gauge point 2 position with the simulation

Fig.15 Stress contour under simple harmonic excitation

Fig.16 Iterative process of clamp position optimization

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