Two-phase flow-induced vibration fatigue damage of tube bundles with clearance restriction

Jiang, Lai; Yang, Shihao; Lu, Lingling; Tan, Tiancai; Sun, Lei

doi:10.1016/j.ymssp.2021.108442

Cited by 12 publications

(2 citation statements)

References 31 publications

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“…In equation ( 2), 𝑔 𝑗 is a constraint that needs to be obeyed during the optimization process, 𝑔 𝑗 is the upper limit value of the jth constraint [5], 𝑔̅ 𝑗 is the lower limit value of the jth constraint, and M is the total number of constraints. F is the objective function of optimization, and its maximum or minimum value can be obtained.…”

Section: Theoretical Basis Of Topological Optimizationmentioning

confidence: 99%

Lightweight Design of Shell Based on Finite Element Method

Jia

Gao

et al. 2023

J. Phys.: Conf. Ser.

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The shell structure design of modern spacecraft internal devices is developing towards lightweight, high-performance, and low-cost. In order to achieve a lightweight construction of the shell structure, this work takes the spacecraft shell as an optimization object. Under the premise of ensuring that the stiffness of the box meets the design requirements, the lightweight construction of the box adopts a post-design optimization method. First, the preliminary design of the model was conducted using SolidWorks, and then the transient dynamic analysis of the model was conducted. The results met the design requirements. Then, the topology of the model is optimized using ANSYS Workbench software, and the optimization results are improved based on assembly conditions. Finally, a transient dynamic analysis of the topology optimized model was performed and compared with previous results. It was found that the design requirements were still met, while the weight was reduced by about 36.8%. This achieved lightweight design of the shell, improved performance, and reduced costs.

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Section: Theoretical Basis Of Topological Optimizationmentioning

confidence: 99%

Lightweight Design of Shell Based on Finite Element Method

Jia

Gao

et al. 2023

J. Phys.: Conf. Ser.

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“…It is noted that when the slender cylinder/pipe has loose supports, the flow-induced vibration behavior becomes complex because of impact and friction forces due to the loose support, which is one of the most important reasons causing wear failures of the cylinder [25]. Therefore, many studies have been performed to explore nonlinear dynamical behviors of cylinders with loose supports in heat exchangers over the past few decades [25][26][27][28][29][30][31][32][33][34]. Experimental investigations [1,12,31] and numerical simulations [26,27] are included.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear vibrations and wear predictions of slender cylinders with loose support subjected to axial flows

He,

Xing,

Dai

et al. 2024

Nonlinear Dyn

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Flow-induced vibration of fuel rods subjected to axial flows frequently appears in nuclear engineering, which has been a significant scientific problem still unsolved. This paper simplifies the fuel rod as a slender cylinder with loose support in axial flows, and explores nonlinear dynamics of the slender cylinder through theoretical modeling. The dynamical model is constructed with consideration of impact and friction forces attributed by the loose support. The results show that the flutter critical flow velocity and wear rate are dependent on clearance size and position of the loose support. The flow velocity range of buckling becomes narrower while the range for flutter becomes wider with the increase of clearance size. The flow velocity range for buckled behavior is widened, the flutter flow speed range is reduced as the clearance position is varied from upward end to downward end of the cylinder. It is indicated that there are optimal values for clearance size and position of the loose support where the flutter critical flow velocity is much higher and the wear rate is lowest. The present study can provide a theoretical basis for predicting flow-induced vibrations and designing the loose support for fuel rods in the nuclear engineering.

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