Optimization of secondary suspension of three-piece bogie with bevelled friction wedge geometry

Ashtiani, Iman Hazrati

doi:10.1080/23248378.2017.1336652

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…It was further stated that the sensitivity analysis results obtained in this paper could narrow down the number of the input design parameters for optimization problems of bogie suspension components and improve the computational efficiency. Ashtiani [28] studied the dynamic characteristics of the friction wedge geometry in the secondary suspension of a freight wagon with three-piece bogies. An optimization formulation was proposed to improve the performance of the wagon in terms of minimizing the extreme normal WR contact and vertical carbody acceleration.…”

Section: Vehicle Suspension Optimization Concerning Wheel Wearmentioning

confidence: 99%

Optimizing wheel profiles and suspensions for railway vehicles operating on specific lines to reduce wheel wear: a case study

Sun

Dongfang

et al. 2020

Multibody Syst Dyn

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The selection of a wheel profile is a topic of great interest as it can affect running performances and wheel wear, which needs to be determined based on the actual operational line. Most existing studies, however, aim to improve running performances or reduce contact forces/wear/rolling contact fatigue (RCF) on curves with ideal radii, with little attention to the track layout parameters, including curves, superelevation, gauge, and cant, etc. In contrast, with the expansion of urbanization, as well as some unique geographic or economic reasons, more and more railway vehicles shuttle on fixed lines. For these vehicles, the traditional wheel profile designing method may not be the optimal choice. In this sense, this paper presents a novel wheel profile designing method, which combines FaSrtip, wheel material loss function developed by University of Sheffield (USFD function), and Kriging surrogate model (KSM), to reduce wheel wear for these vehicles that primarily operate on fixed lines, for which an Sgnss wagon running on the German Blankenburg–Rübeland railway line is introduced as a case. Besides, regarding the influence of vehicle suspension characteristics on wheel wear, most of the studies have studied the lateral stiffness, longitudinal stiffness, and yaw damper characteristics of suspension systems, since these parameters have an obvious influence on wheel wear. However, there is currently little research on the relationship between the vertical suspension characteristics and wheel wear. Therefore, it is also investigated in this paper, and a suggestion for the arrangement of the vertical primary spring stiffness of the Y25 bogie is given.

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Section: Vehicle Suspension Optimization Concerning Wheel Wearmentioning

confidence: 99%

Optimizing wheel profiles and suspensions for railway vehicles operating on specific lines to reduce wheel wear: a case study

Sun

Dongfang

et al. 2020

Multibody Syst Dyn

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“…A methodology for identifying the model parameters has been described in Hazrati Ashtiani et al 27 and Hazrati Ashtiani. 28 The pointplane contact approach could efficiently estimate the resultant friction moments developed at the center plates and side bearings under relative rotations of the contacting bodies encountered during curving or switch-passing maneuvers. The variations in interactions between the car body and the center plate (bogie) under varying loads could also be described accurately using this modeling approach.…”

Section: Model Formulations Mbd Model Of the Tank Carmentioning

confidence: 99%

Investigation of coupled dynamics of a railway tank car and liquid cargo subject to a switch-passing maneuver

Ashtiani

Rakheja

Ahmed

2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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The movement of the liquid cargo within a partly filled tank car is known to impose additional slosh forces and moments that may adversely affect the dynamic responses of the vehicle. This study is aimed at analyzing the liquid cargo slosh in a partly filled tank car and its effects on vehicle responses during a switch-passing maneuver. A two-dimensional analytical liquid slosh model is formulated for the analyses of the liquid load shift in the roll plane, lateral slosh force, and roll moment through summation of first four antisymmetric modes of the liquid. The analytical slosh model is integrated to a 114 degrees-of-freedom multibody dynamic model of the railway tank car comprising nonlinear wheel–rail contact and contact pairs of the suspension system. The validity of the slosh model is illustrated by comparing the responses with those reported in other studies and those obtained from a nonlinear computational fluid dynamic model. The coupled fluid–vehicle model is subsequently used to study the effects of fluid slosh during switch-passing maneuvers on different response measures, namely roll motion of the tank car, lateral and vertical wheel–rail contact forces, and derailment ratio. The significance of the liquid cargo slosh in the partially filled state is demonstrated by comparing the responses with those of the car with equivalent rigid cargo. The results show that liquid sloshing within the partly filled car can lead to higher magnitudes of car body roll angle and thereby the unloading ratio compared to the conventional rigid cargo car. Switch-passing critical speeds are further identified for different fill ratios and switch geometries. For fill ratios below 80%, the switch-passing critical speeds of the partly filled car are substantially lower compared to those of the equivalent rigid cargo car. Neglecting the contributions due to dynamic slosh force and roll moment arising from a partially filled railway tank car may thus lead to underestimation of the critical speed in switch-passing maneuvers.

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“…Researchers worldwide have conducted numerous studies on the optimization of the primary suspension parameters of the bogie. Ashtiani et al [3] made a three-piece bogie wagon the subject of a study, minimized the vertical acceleration, and optimized the geometries of the inclined chisel for unloaded and heavily loaded scenarios. Yang et al [4,5] showed that the lateral frame force depends upon the relative interplay of lateral bogie stiffness and the snubbing force for the subject suspension designs.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization of Bogie Stability for Minimum Radius Curve of Battery Track Engineering Vehicle

Shen,

Zhao,

Wang

et al. 2024

Applied Sciences

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A battery track engineering vehicle faces challenges such as derailment and other safety concerns when navigating an R20m minimum radius curve, primarily owing to its low vertical and horizontal stabilities. To address these issues, a methodology integrating genetic optimization algorithms with a rigid and flexible coupled multi-body dynamics simulation is proposed to optimize the primary suspensions of the bogie of the vehicle. Initially, a multi-objective optimization model combining rigid and flexible coupled multi-body dynamics of battery track engineering vehicles with a genetic optimization algorithm was formulated. Subsequently, the optimal Latin hypercube design was applied to analyze the sensitivity of vertical and horizontal stability to various suspension parameters. Finally, a non-dominated sorting genetic algorithm (NSGA-II) and an archive-based micro genetic algorithm (AMGA) were applied to optimize the primary suspensions to enhance stability. Consequently, a set of optimal suspension parameter combinations was obtained. A notable enhancement was observed in the lateral stability of the optimized battery track engineering vehicles by 23.33% and in the vertical stability by 3.5% when traversing the R20m minimum radius curve, thereby establishing a theoretical foundation for further improving the running safety of railway vehicles and resolving the shortcomings of less research on the smallest radius curve.

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Optimization of secondary suspension of three-piece bogie with bevelled friction wedge geometry

Cited by 10 publications

References 18 publications

Optimizing wheel profiles and suspensions for railway vehicles operating on specific lines to reduce wheel wear: a case study

Optimizing wheel profiles and suspensions for railway vehicles operating on specific lines to reduce wheel wear: a case study

Investigation of coupled dynamics of a railway tank car and liquid cargo subject to a switch-passing maneuver

Multi-Objective Optimization of Bogie Stability for Minimum Radius Curve of Battery Track Engineering Vehicle

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