Finite Element Model Updating for Improved Box Girder Bridges with Corrugated Steel Webs Using the Response Surface Method and Fmincon Algorithm

Ji, Wei; Shao, Tianyan

doi:10.1007/s12205-020-0591-3

Cited by 17 publications

(4 citation statements)

References 20 publications

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“…In the pre-trials, four different solvers were considered for the optimization. At first, "fmincon", which is a MATLAB solver that finds the minimum of a single-optimization problem with constraints, was examined [40]. fmincon is fast, but it gets stuck in the local minima, so it was concluded that it is not suitable for use in the optimization of the thermal part of the Claus process.…”

Section: Tools and Methodsmentioning

confidence: 99%

Using Reduced Kinetic Model for the Multi-Objective Optimization of Thermal Section of the Claus Process Leading to a More Cost-Effective and Environmentally Friendly Operation

Andoglu Coskun,

Kaytakoglu,

Manenti

et al. 2024

Processes

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The Claus process is a sulfur recovery unit wherein hydrogen sulfide is converted into the elemental sulfur. This study aims to model the thermal section of the Claus process, which consists of a reaction furnace and a waste heat boiler, as a configuration of two reactors, and subsequently optimize the entire section. Two different reduced kinetic schemes were provided for both units. Using the validated kinetics, mathematical models were developed. The waste heat boiler was modeled as a plug flow reactor with heat transfer, instead of a heat exchanger. The main objective was to maximize the amount of elemental sulfur at the end of the thermal section. Additionally, maximizing the amount of steam generated in the WHB was considered as a secondary objective, and the multi-objective optimization problem was solved. The sulfur production was improved 14.1% and 30% as a result of single- and multi-objective optimization studies. In addition, as an alternative, the Taguchi method was also used for optimization studies, and optimum values were determined. Using the Taguchi method, we determined that an increase in sulfur production by 24% is possible.

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Section: Tools and Methodsmentioning

confidence: 99%

Using Reduced Kinetic Model for the Multi-Objective Optimization of Thermal Section of the Claus Process Leading to a More Cost-Effective and Environmentally Friendly Operation

Andoglu Coskun,

Kaytakoglu,

Manenti

et al. 2024

Processes

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“…According to the influence law of radial variation in the centroid in Section 4.1, the BYQ-GS spherical robot in Experiment 1 and Experiment 2 both adopted the inverted pendulum driving mode; that is, the driving mode parameter i in Equation ( 30) was set to two, and the optimization problem shown in Equation (30) was solved using the Fmincon function in MATLAB R2021a, yielding the optimal pendulum length denoted as L = 0.105 m for Experiment 1 and L = 0.092 m for Experiment 2 [37,38]. Throughout the experiments, the parameters of the HSMC controller were maintained consistent with Route 2, depicted in Figure 6.…”

Section: Experimental Verification Of Motion Performance Analysis Res...mentioning

confidence: 99%

Research on the Influence of Radial Variation of Centroid on the Motion of Spherical Robot

Ma,

Li,

Chang

et al. 2024

Machines

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Through the pendulum mechanism inside the spherical shell, the centroid can be varied circumferentially, enabling the spherical robot to achieve omnidirectional flexible movement. Additionally, the radial variation ability of the centroid enables spherical robots to adopt two distinct driving modes: the traditional lower pendulum driving mode and the inverted pendulum driving mode. There are two manifestations of radial variation in the centroid: having different radial positions of the centroid and achieving radial movement of the centroid. Focusing on these two manifestations, experimental data are obtained through different motion velocities and different motion slopes to conduct research on the influence of radial variation in the centroid on the motion of spherical robots. Based on the experimental data, multiple indicators are analyzed, including response speed, convergence speed, stability, and overshoot, as well as steering ability, climbing ability, and output power. The impact of the radial variation ability of the centroid on the control performance, locomotion capability, and energy consumption of spherical robots is summarized, and the correlation model relating the motion requirements to the radial position of the centroid is established, providing a theoretical basis for the selection of driving modes and centroid positions for spherical robots facing complex task requirements.

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“…The calculated theoretical values were generally verified using the finite element method. Ji et al [19] proposed a bridge finite element model modification method based on the response surface method and Fmincon algorithm. This significantly improves the finite element calculation accuracy of the transverse internal force of a box girder.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the transverse internal force of a box girder using the energy variational principle

2024

JCE

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This study investigated the transverse internal force of a box girder with a trapezoidal cross-section under eccentric loading. The effects of the box girder distortion and frame shear difference on the transverse internal force were considered. An energy variation method based on the minimum potential energy principle was adopted for transverse internal force analysis of the frames. The variable shear difference of the top slab was considered an unknown quantity, and a fourth-order governing differential equation was established. The transverse bending moment of the frame was obtained by solving for the shear difference. Two examples were used to verify the proposed method and analyse the differences between the transverse internal force results calculated using different methods. The effect of the distribution of the box-girder distorted transverse bending moment on each slab was investigated for various stiffness ratios. The results showed that the transverse internal force of the box girder calculated using the proposed method agreed well with the finite element results, with a maximum error of less than 9.68 %. When the stiffness ratio of the box girder increased, the distribution of the distorted transverse bending moment on the top slab increased, whereas that on the bottom slab decreased.

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Finite Element Model Updating for Improved Box Girder Bridges with Corrugated Steel Webs Using the Response Surface Method and Fmincon Algorithm

Cited by 17 publications

References 20 publications

Using Reduced Kinetic Model for the Multi-Objective Optimization of Thermal Section of the Claus Process Leading to a More Cost-Effective and Environmentally Friendly Operation

Using Reduced Kinetic Model for the Multi-Objective Optimization of Thermal Section of the Claus Process Leading to a More Cost-Effective and Environmentally Friendly Operation

Research on the Influence of Radial Variation of Centroid on the Motion of Spherical Robot

Investigation of the transverse internal force of a box girder using the energy variational principle

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