Unsteady Aerodynamic Characteristics and Safety of High-speed Trains under Crosswinds

Liang, Zhang

doi:10.3901/jme.2016.06.124

Cited by 7 publications

(7 citation statements)

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“…The examples of work concerning macroscopic tests of fatigue wear in gear pumps are e.g. [31][32][33]. In the work [31] experimental tests of macroscopic fatigue wear in gear pumps, concentrating on an analysis of failure and prevention have been conducted.…”

Section: Macroscopic Tests Of Gear Pumpsmentioning

confidence: 99%

“…In the work [32] its authors carried out a macroscopic observation and an analysis of a fatigue damage in gear pumps at different operational conditions. In turn, in the work [33] the test is concentrated on macroscopic characteristics of gear pumps failures in the conditions of high speed and big load. In these tests an essential aspect includes an analysis of so called pitting, i.e.…”

Section: Macroscopic Tests Of Gear Pumpsmentioning

confidence: 99%

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Micro and Macroscopic Analysis of Fatigue Wear of Gear Wheel Top Layer – an Impact Analysis of Thermochemical Treatment

Osiński,

Dudziński,

Deptuła

et al. 2024

Preprint

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The main purpose of this work was to tests of form and size of fatigue wear of the top layer of oil gear pump wheel (3PW-BPF-24). The object of tests was operated during a determined number of hours at strictly controlled operational and environmental parameters. A microscope of focal differentiation by Alicona InfiniteFocus G4 (with Focus-Variation optical measuring technology) was used for an identification, measurement and description of noticed superficial defects, which resulted from the fatigue process of the top layer and an earlier thermochemical treatment. The work was finished with an analysis of obtained results (based on the analysis of 3D scans) and conclusions concerning about optimization of the thermal treatment. Taking into consideration the presented results (suggestions) in the technology of improving strength properties of gear wheels (of this type oil pumps) may render it possible to obtain an appropriate fatigue endurance of the top layer, i.e. a minimization of observed superficial defects.

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Section: Macroscopic Tests Of Gear Pumpsmentioning

confidence: 99%

Section: Macroscopic Tests Of Gear Pumpsmentioning

confidence: 99%

Micro and Macroscopic Analysis of Fatigue Wear of Gear Wheel Top Layer – an Impact Analysis of Thermochemical Treatment

Osiński,

Dudziński,

Deptuła

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The examples of work concerning macroscopic tests of fatigue wear in gear pumps are e.g. [27][28][29]. In the work [27] experimental tests of macroscopic fatigue wear in gear pumps, concentrating on an analysis of failure and prevention have been conducted.…”

Section: Macroscopic Tests Of Gear Pumpsmentioning

confidence: 99%

Micro and Macroscopic Analysis of Fatigue Wear of Gear Wheel Top Layer – an Impact Analysis of Thermochemical Treatment

Osiński,

Dudziński,

Deptuła

et al. 2024

Preprint

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An analysis of form and size of the fatigue wear of gear wheel top layer of the prototype oil pump (type 3PW-BPF-24) is presented in the publication. The object of research was subject to endurance tests, so called labour resource test. During this test the pump was loaded in cycles with maximal working pressure. Additionally, continuous monitoring tests of exploitational and environmental parameters were conducted. After a completion of the endurance test the noticed superficial defects due to a phenomenon of the top layer fatigue and previously applied thermochemical treatment were measured and described. The work was finished with an analysis of obtained results and conclusions concerning a selection optimization of the thermal treatment parameters. Taking into consideration the presented results (suggestions) in the technology of improving strength prop-erties of gear wheels (of this type oil pumps) may render it possible to obtain an appropriate fa-tigue endurance of the top layer, i.e. a minimization of observed superficial defects.

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“…Both the calculated and experimental results indicated that the aerodynamic performance of the train running on the leeward side of an embankment was worse than that of the train running on the windward side. Zhang et al 9 studied the unsteady aerodynamic characteristics and operational safety of a high-speed train under crosswinds running on different infrastructures, such as grounds, embankments, and viaducts. The results indicated that both the aerodynamic performance and the operational safety of the trains running on the leeward side of an embankment were worse than those of the trains running in other conditions.…”

Section: Introductionmentioning

confidence: 99%

“…It is known that the aerodynamic performance of a train under crosswinds is worse than that in conditions without crosswind, and the case of a train running on the leeward side of an embankment is the most critical. 8,9 Consequently, the multiobjective optimization design process of the head shape of a high-speed train running on the leeward side of an embankment in the crosswind conditions was established in this study, taking the total aerodynamic drag coefficient ( C d ), aerodynamic lift coefficient ( C l ), and aerodynamic side coefficient ( C s ) of the head coach as the optimization objectives. The free-form deformation (FFD) approach was used to realize the deformation of the head shape without remodeling and re-meshing.…”

Section: Introductionmentioning

confidence: 99%

A multiobjective aerodynamic optimization design of a high-speed train head under crosswinds

Zhang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part F:

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In this work, a multiobjective aerodynamic optimization of a high-speed train head was performed to improve the aerodynamic performance of the high-speed train running on an embankment under crosswinds. Seven optimization design variables were selected to control five regions on the train head. The total aerodynamic drag force, aerodynamic lift force, and aerodynamic side force of the head coach were set as the optimization objectives. The optimal Latin hypercube sampling method was used to obtain the values of the design variables of the sample points. The high-speed train head was deformed using the free-form deformation approach through which the mesh morphing was performed without remodeling and re-meshing. Then, the aerodynamic performances of the high-speed trains at the sample points were calculated using the computational fluid dynamics method. A Kriging surrogate model between the design variables and their optimization objectives was constructed. Then, the multiobjective aerodynamic optimization of the high-speed train head was performed using multiobjective genetic algorithms based on the Kriging model. Based on the results of the sample points, the relationships between the optimization design variables and the optimization objectives were analyzed, and the contributions of the primary factors to the optimization objectives were obtained. After optimization, a series of Pareto-optimal head shapes were obtained. The steady and unsteady aerodynamic performances of the train with an optimal head, which was selected from the Pareto-optimal head shapes, were compared with those of the original train.

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Unsteady Aerodynamic Characteristics and Safety of High-speed Trains under Crosswinds

Cited by 7 publications

References 0 publications

Micro and Macroscopic Analysis of Fatigue Wear of Gear Wheel Top Layer – an Impact Analysis of Thermochemical Treatment

Micro and Macroscopic Analysis of Fatigue Wear of Gear Wheel Top Layer – an Impact Analysis of Thermochemical Treatment

Micro and Macroscopic Analysis of Fatigue Wear of Gear Wheel Top Layer – an Impact Analysis of Thermochemical Treatment

A multiobjective aerodynamic optimization design of a high-speed train head under crosswinds

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