Prediction and application of energy absorption characteristics of thin-walled circular tubes based on dimensional analysis

Yao, Shuguang; Yan, Kaibo; Lu, Sisi; Xu, Ping

doi:10.1016/j.tws.2018.06.015

Cited by 25 publications

(11 citation statements)

References 36 publications

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“…• the direct analysis of the differential relations that describe the phenomenon, in order to establish the dimensionless groups, does not always allow the unitary establishment of the complete set of these dimensionless groups; • also, the classical methodology (CDA) is usually cumbersome and non-unitary, allowing different researchers to obtain different sets of dimensionless variables; • in order to obtain these dimensionless groups, the authors of different works use, based on the application of Buckingham's theorem, either the normalization of the terms of the differential relations related to the phenomenon describing the phenomenon, or a rather arbitrary and unambiguous combination of variables involved in describing the phenomenon of the main measure (dimensions), which takes place in each author according to his own logic, so it is a non-unitary approach to the phenomenon. Thus, based on these approaches, different sets of dimensionless variables may result, which may even represent combinations of those deduced by other authors [36,[38][39][40][41][42][43][44][45][46][47]. • the classical methodology, i.e., CDA, presupposes from the very beginning a deep knowledge of the phenomenon and of the differential relations that govern the phenomenon, which for an ordinary researcher represents an impediment; • the classical methodology, including those presented in the papers [22,23,25,[27][28][29][30], does not explicitly allow highlighting from the very beginning of the set of independent variables or dependent variables, but applies a hard-to-follow (and often unexplained) logic of how these two sets were chosen; • the involvement from the very beginning, in approaching with the help of the dimensional analysis of the phenomenon, of some very complicated differential relations whose analysis will eventually lead to the establishment of these dimensionless groups, discourages the vast majority of researchers/engineers from using a safe, unified, and simple way to approach the problem, as will happen with MDA;…”

Section: Discussionmentioning

confidence: 97%

“…In the paper [41], the dimensionless groups are arbitrarily defined, based on a combination, according to their own logic.…”

Section: Discussionmentioning

confidence: 99%

“…A fire protection, in addition to maintaining the flexibility of the original structure, leads both to maintaining the initial load-bearing capacity of the resistance structure for a longer time in case of fire and to increase the guaranteed time for evacuation of persons and property subjected to fire. Other recent studies concerning dimensional analysis are presented in [33][34][35][36][37][38][39][40][41].…”

Section: Objectives and Purpose Of The Papermentioning

confidence: 99%

See 2 more Smart Citations

Thermal Scaling of Transient Heat Transfer in a Round Cladded Rod with Modern Dimensional Analysis

Gálfi¹,

Şova

Szavá

2021

Mathematics

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Heat transfer analysis can be studied efficiently with the help of so-called modern dimensional analysis (MDA), which offers a uniform and easy approach, without requiring in-depth knowledge of the phenomenon by only taking into account variables that may have some influence. After a brief presentation of the advantages of this method (MDA), the authors applied it to the study of heat transfer in straight bars of solid circular section, protected but not thermally protected with layers of intumescent paints. Two cases (two sets of independent variables) were considered, which could be easily tracked by experimental measurements. The main advantages of the model law obtained are presented, being characterized by flexibility, accuracy, and simplicity. Additionally, this law and the MDA approach allow us to obtain much more advantageous models from an experimental point of view, with the geometric analogy of the model with the prototype not being a necessary condition. To the best knowledge of the present authors there are no studies reporting the application of the MDA method as it was used in this paper to heat transfer.

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Section: Discussionmentioning

confidence: 97%

“…In the paper [41], the dimensionless groups are arbitrarily defined, based on a combination, according to their own logic.…”

Section: Discussionmentioning

confidence: 99%

Section: Objectives and Purpose Of The Papermentioning

confidence: 99%

See 1 more Smart Citation

Thermal Scaling of Transient Heat Transfer in a Round Cladded Rod with Modern Dimensional Analysis

Gálfi¹,

Şova

Szavá

2021

Mathematics

View full text Add to dashboard Cite

show abstract

“…The design of experiments (DOE), the sampling determines the number and the spatial distribution of conduct a reasonable statistical analysis of the experi The hammersley sequence leads to a nearly quadratic r compared with the uniform sampling method, and th while maintaining the same level of accuracy [35]. In th method was adopted, and 50 levels for each variable we model.…”

Section: Design Of Experimentsmentioning

confidence: 99%

Full-Scale Train-to-Train Impact Test and Multi-Body Dynamic Simulation Analysis

Zhao

et al. 2021

Machines

Self Cite

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When a train crashes with another train at a high speed, it will lead to significant financial losses and societal costs. Carrying out a train-to-train crash test is of great significance to reproducing the collision response and assessing the safety performance of trains. To ensure the testability and safety of the train collision test, it is necessary to analyze and predict the dynamic behavior of the train in the whole test process before the test. This paper presents a study of the dynamic response of the train in each test stage during the train-to-train crash test under different conditions. In this study, a 1D/3D co-simulation dynamics model of the train under various load conditions of driving, collision and braking has been established based on the MotionView dynamic simulation software. The accuracy of the numerical model is verified by comparing with a five-vehicle formations train-to-train crash test data. Sensitivities of several key influencing parameters, such as the train formation, impact velocity and the vehicle mass, are reported in detail as well. The results show that the increase in the impact velocity has an increasing effect on the movement displacement of the vehicle in each process. However, increasing the vehicle mass and train formation has almost no effect on the running displacement of the braking process of the traction train. By sorting the variables in descending order of sensitivity, it can be obtained that impact speed > train formation > vehicle mass. The polynomial response surface method (PRSM) is used to construct the fitting relationship between the parameters and the responses.

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“…In recent years, thin-walled structures have been widely used as energy-absorbing devices because of their low masses and high energy absorption efficiencies. 1 As thin-walled structures, aluminium honeycombs, owing to their properties including low density, high specific energy absorption, and controllable deformation, have also been widely used as energy absorbers. 2,3…”

Section: Introductionmentioning

confidence: 99%

Experimental study of a honeycomb energy-absorbing device for high-speed trains

Li¹,

Zhang²,

Ke-fei³

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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Aluminium honeycomb is a light weight, thin-walled material with a typical multi-cellular construction and a good strength-to-weight ratio. Therefore, aluminium honeycomb can be used as an energy-absorbing device for high-speed trains. Due to its large mass and high operating speed, a high-speed train can generate large impact energy. Thus, an energy-absorbing device with a greater energy absorption capability must be designed for high-speed trains. To reduce the aerodynamic drag, the cross-sectional area of a high-speed train is limited. Therefore, a honeycomb energy-absorbing device should be designed in such a way that it is longer than the traditional energy-absorbing devices; however, this may lead to bending, destruction and uncontrollable deformation of the honeycomb; these factors are not conducive for energy absorption. In this paper, a sleeve structure was designed for high-speed trains, and a crash experiment of the energy-absorbing structure showed that the bending and destruction of the honeycomb energy-absorbing device are effectively suppressed compared with the ordinary honeycomb energy-absorbing structure. Moreover, the fluctuation of the crash force was smaller and the crash force is more stable than the traditional thin-walled energy-absorbing structure. Therefore, the deformation instability problem of the ordinary honeycomb energy-absorbing structure and the crash force fluctuation problem of the traditional thin-walled energy-absorbing structure can be solved. Then, a crash experiment and simulation involving a high-speed train with improved honeycomb energy-absorbing device was carried out, and the results showed that the deformation of the end of the train body was stable and controllable, and the train body deceleration satisfied the collision standard EN15227.

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Prediction and application of energy absorption characteristics of thin-walled circular tubes based on dimensional analysis

Cited by 25 publications

References 36 publications

Thermal Scaling of Transient Heat Transfer in a Round Cladded Rod with Modern Dimensional Analysis

Thermal Scaling of Transient Heat Transfer in a Round Cladded Rod with Modern Dimensional Analysis

Full-Scale Train-to-Train Impact Test and Multi-Body Dynamic Simulation Analysis

Experimental study of a honeycomb energy-absorbing device for high-speed trains

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