Implementing railway vehicle dynamics simulation in general-purpose multibody simulation software packages

2019 ◽  
Vol 131 ◽  
pp. 153-165 ◽  
Author(s):  
Zhao Tang ◽  
Xiaolin Yuan ◽  
Xin Xie ◽  
Jie Jiang ◽  
Jianjun Zhang
Keyword(s):  
Vehicle Dynamics ◽  
General Purpose ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Railway Vehicle ◽  
Multibody Simulation ◽  
Software Packages

Integrated Methodology for Investigation of Wagon Bogie Concepts by Simulation

2014 ◽  
Author(s):  
S. S. N. Ahmad ◽  
C. Cole ◽  
M. Spiryagin ◽  
Y. Q. Sun
Keyword(s):  
Dynamic Behaviour ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Concept Design ◽  
Multibody Simulation ◽  
Worst Case ◽  
Multibody Model ◽  
Second Stage ◽  
Force Components ◽  
Train Simulation

Implementation of a new bogie concept is an integrated part of the vehicle design which must follow a rigorous testing and validation procedure. Use of multibody simulation helps to reduce the amount of time and effort required in selecting a new concept design by analysing results of simulated dynamic behaviour of the proposed design. However, the multibody simulation software mainly looks at the dynamics of a single vehicle; hence, forces from the train configuration operational dynamics are often absent in such simulations. Effects of longitudinal-lateral and longitudinal-vertical interactions between rail vehicles have been found to affect the stability of long trains [1,2]. The effect of wedge design on the vertical dynamics of a bogie has also been discussed in [3,4]. It is important to apply the lateral and vertical forces from a train simulation into a single multibody model of a wagon to check its behaviour when operating in train configuration. In this paper, a novel methodology for the investigation of new bogie designs has been proposed based on integrating dynamic train simulation and the multibody vehicle modelling concept that will help to efficiently achieve the most suitable design of the bogie. The proposed methodology suggests that simulation of any configuration of bogie needs to be carried out in three stages. As the first stage, the bogie designs along with the wagon configurations need to be presented as a multibody model in multibody simulation software to test the suitability of the concept. The model checking needs to be carried out in accordance with the wagon model acceptance procedure established in [5]. As the second stage, the wagon designs need to be tested in train configurations using a longitudinal train dynamics simulation software such as ‘CRE-LTS’ [2], where a train set consisting of the locomotives and wagons will be simulated to give operational wagon parameters such as lateral and vertical coupler force components. As the third stage, the detailed dynamic analysis of bogies and wagons needs to be performed with a multibody software such as ‘Gensys’ where lateral and vertical coupler force components from the train simulation (second stage) will be applied on the multibody model to replicate the worst case scenario. The proposed methodology enhances the selection procedure of any alternate bogie concept by the application of simulated train and vehicle dynamics. The simulated case studies show that simulation of wagon dynamic behaviour in multibody software combined with data obtained from longitudinal train simulation is not only possible, but it can identify issues with a bogie design that can otherwise be overlooked.

scholarly journals Suspension parameter design of underframe equipment considering series stiffness of shock absorber

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402092264
Author(s):  
Jie Chen ◽  
Yangjun Wu ◽  
Xiaolong He ◽  
Limin Zhang ◽  
Shijie Dong
Keyword(s):  
Simulation Software ◽  
Dynamics Simulation ◽  
Ride Quality ◽  
Railway Vehicle ◽  
Vibration Absorber ◽  
Dynamic Vibration Absorber ◽  
Suspension Parameters ◽  
Dynamic Vibration ◽  
Beam System ◽  
Element Type

In this article, a vertical rigid–flexible coupling model between the vehicle and the equipment is established. Considering the series stiffness of hydraulic shock absorbers, the underframe equipment is like a three-element-type Maxwell model dynamic vibration absorber. The carbody is approximated by an elastic beam and the three-element-type dynamic vibration absorber for general beam system was studied by fixed-point theory. The analytical solution of the optimal suspension parameters for the beam system subjected to harmonic excitation is obtained. The dynamic vibration absorber theory is applied to reduce the resonance of the carbody and to design the suspension parameters of the underframe equipment accordingly. Then, the railway vehicle model was established by multi-body dynamics simulation software, and the vibration levels of the vehicle at different speeds were calculated. A comparative analysis was made between the vehicles whose underframe equipment was suspended by the three-element-type dynamic vibration absorber model and the Kelvin–Voigt-type dynamic vibration absorber model, respectively. The results show that, compared with the vehicle whose underframe equipment is suspended by the Kelvin–Voigt-type dynamic vibration absorber model, the vehicle whose underframe equipment is suspended by the three-element-type dynamic vibration absorber model can achieve a much better ride quality and root mean square value of the vibration acceleration of the carbody. The carbody elastic vibration can be reduced and the vehicle ride quality can be improved effectively using the designed absorber.

Estimating Pacejka (PAC2002) Tire Coefficients for Pneumatic Tires on Soft Soils With Application to BAJA SAE Vehicles

2019 ◽  
Author(s):  
Amanda Saunders ◽  
Darris White ◽  
Marc Compere
Keyword(s):  
Vehicle Dynamics ◽  
Integration Method ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Road Vehicles ◽  
Traction Forces ◽  
Soft Soils ◽  
Vehicle Performance ◽  
Vehicle Simulation ◽  
Stress Integration

Abstract BAJA SAE is an engineering competition that challenges teams to design single-seat all-terrain vehicles that participate in a vast number of events, predominately on soft soils. Efficient performance in the events depends on the traction forces, which are dependent on the mechanical properties of the soil. To accurately model vehicle performance for each event, a model of the tire traction performance is required, and the tire model must be incorporated with a vehicle dynamics simulation. The traction forces at the soil-tire interface can be estimated using the Bekker-Wong stress integration method. However, commercially available vehicle dynamics simulation software, with a focus on on-road vehicles, does not utilize Bekker-Wong parameters. The Pacejka Magic Tire (MT) Formula is a common method for characterizing tire behavior for on-road vehicles. The parameters for the Pacejka MT Formula are usually produced by curve fitting measured tire data. The lack of available measured off-road tire data, as well as the additional variables for off-road tire performance (e.g. soil mechanics), make it difficult for BAJA SAE teams to simulate vehicle performance using commercial vehicle simulation tools. This paper discusses the process and results for estimating traction performance using the Bekker-Wong stress integration method for soft soils and then deriving the Pacejka coefficients based on the Bekker-Wong method. The process will enable teams to use the Pacejka Magic Tire Formula coefficients for simulating vehicle performance for BAJA SAE events, such as the hill climb, (off-road) land maneuverability, tractor pull, etc.

Multi-step wear evolution simulation method for the prediction of rail wheel wear and vehicle dynamic performance

SIMULATION ◽  
2018 ◽  
Vol 95 (5) ◽  
pp. 441-459 ◽  
Author(s):  
Smitirupa Pradhan ◽  
AK Samantaray ◽  
R Bhattacharyya
Keyword(s):  
Vehicle Dynamics ◽  
Ride Comfort ◽  
Dynamic Performance ◽  
Travel Distance ◽  
Rolling Contact ◽  
Dynamics Simulation ◽  
Railway Vehicle ◽  
Wear Depth ◽  
Wheel Wear ◽  
Wheel Profile

This paper presents a complete model to estimate the effects of wheel wear on the dynamic behavior and ride comfort of a railway vehicle. A co-simulation of the vehicle dynamics modeled in ADAMS VI-Rail and wear evolution modeled in MATLAB is performed in a loop. The outputs from the vehicle dynamics simulation are used to compute the wear evolution, which in turn affects the vehicle dynamics. The local contact parameters, such as normal contact force, tangential stresses and slip, etc., and wear distribution for each cell of the contact surface are estimated with the help of Kalker’s simplified theory of rolling contact and Archard’s wear model, respectively. The wear distribution and smoothening of the wheel profile are obtained for a short travel distance and are then scaled up for larger travel distance. The worn wheel profile is updated in the vehicle dynamics model after every 10,000 km of travel for further dynamic analysis and this process is repeated until either the critical dynamic performance or wheel wear limits are reached. Several new results emerge by considering both acceleration and braking on a tangent track with sinusoidal irregularities. Critical speed appears to increase initially and then decrease quickly, whereas worn wheels give better ride comfort in both lateral and vertical directions as compared to new wheels. According to the results in this work, wheels may be recommended for re-profiling or replacement much before the critical wear depth recommended in maintenance guidelines is reached.

Investigation of Control Design of Vehicle Active Steering

2008 ◽  
Author(s):  
Azim Eskandarian ◽  
Mathias Bauer ◽  
Damoon Soudbakhsh
Keyword(s):  
Vehicle Dynamics ◽  
Pid Controller ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Space Representation ◽  
Small Range ◽  
State Space Representation ◽  
Active Steering ◽  
Bicycle Model ◽  
Utility Vehicle

The design of a controller for active steering systems in evasive maneuvers of vehicles is investigated. Dynamics of a vehicle using the bicycle model along with a steering model is developed in state space representation. Parameters of a sports utility vehicle are used. The developed model is validated with simulation results from a commercial vehicle dynamics simulation software. The effects of a PID controller to control the host vehicle in obstacle avoidance maneuvers are investigated. The desired trajectory path is used as an input, and influence of the different gain parameters are studied. Controller can handle disturbances (such as driver’s input) supporting or opposing the maneuver up to a limit. It handles reduced headway distances up to about 60% of the distance to obstacles, but is only capable of keeping the system stable in a small range of velocities.

Working Mechanism of Brake Unit on Railway Vehicle and its MBD Simulation Experiment

2013 ◽  
Vol 579-580 ◽  
pp. 901-905
Author(s):  
Bao Zhang Qu ◽  
Yu Liu ◽  
Bi Hong Lu ◽  
Yu Zhang ◽  
Hong Bo Zhang
Keyword(s):  
Simulation Experiment ◽  
Geometric Model ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Railway Vehicle ◽  
Structure Stability ◽  
Displacement Curve ◽  
Disc Brake ◽  
Working Mechanism ◽  
Safety And Reliability

The safety and reliability of railway vehicle braking system is put forward higher requirement for railway speed increasing. Compared with domestic product, foreign disc brake unit has obvious advantage on compactness of structure, stability of braking pad friction coefficient, braking power, safety and reliability etc. Thus, the research has theoretical significance and engineering value. Firstly, the working principle of disc brake unit is obtained by performing spatial mechanisms analysis of some imported disc brake unit and adjuster structure, then using MBD (Multi-body Dynamics) simulation software, by importing the geometric model of brake unit into RecurDyn, to make preprocess of simplifying and merging and add constraints and contact relation, driving control functions, etc, finally to establish a simulation experiment model. The working characteristic of the brake unit and adjuster's displacement curve of clearance compensation is obtained through the braking and releasing simulation results of braking pad before and after wear out. The research results provide a method based on virtual prototype for analyzing and validating working mechanism of disc brake unit.

Analysis of the Deterioration of Harmonic Local Irregularity on Locomotive Wheel-Rail Vertical Force

2014 ◽  
Vol 684 ◽  
pp. 137-144 ◽  
Author(s):  
Di Lai Chen ◽  
Jian Xin Liu ◽  
Kai Jun Du ◽  
Yan Wang
Keyword(s):  
Vehicle Dynamics ◽  
Strong Shock ◽  
Harmonic Excitation ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Vertical Force ◽  
External Excitation ◽  
Body Dynamics ◽  
Multi Body ◽  
Local Irregularity

By the MATLAB software the article simulated the local irregularity, the new harmonic excitation superimposed on the initial harmonic to simulate track settlement deterioration, the new uplift excitation superimposed on the initial harmonic to simulate track raised deterioration, as the locomotive model external excitation, using the SIMPACK multi-body dynamics simulation software to analyze the influences of the deterioration of harmonic local irregularity on locomotive wheel-rail vertical force, on the basis of the locomotive wheel-rail interaction dynamics index by the locomotive vehicle dynamics theory. The simulation results show that when the deterioration of harmonic local irregularity occurs, even if the amplitude of deterioration is small, which will cause serious deterioration of wheel-rail dynamic response and strong shock and vibration of wheel-rail .The larger amplitude of harmonic local irregularity, the greater of the maximum wheel-rail vertical force. When deterioration of the amplitude exceeds a certain value, the maximum of the wheel-rail vertical force exceedes the limit, which will cause derailment. The wheel-rail dynamic interaction increases with the speed increasing. At the same speed (such as 120km/h), harmonic local irregularity settlement deterioration compareing to harmonic local irregularity raised deterioration, the maximum of the wheel-rail vertical force increases 14.4%. Therefore, local irregularity deterioration or the speed of the locomotive should be strictly controlled.

A C-Legged Monopedal Robot and Its Transition From Multiple Locomotion Modes

2020 ◽  
Vol 12 (4) ◽  
Author(s):  
Guochao Bai ◽  
Bernhard Thomaszewski
Keyword(s):  
Simulation Software ◽  
Dynamics Simulation ◽  
Multibody Simulation ◽  
Experimental Platform ◽  
Speed Controller ◽  
Potential Applications ◽  
Dimensional Parameters ◽  
3D Printed ◽  
Planet Exploration ◽  
Multi Mode

Abstract This paper introduces a minimalistic design of a monopedal robot (monobot) with C-shaped legs which can achieve multiple locomotion modes (multi-mode) such as walking, leaping, as well as backward and forward flipping. The monobot contains an actuator, speed controller, 3D-printed base frame and legs, and battery set. The weight of the whole robot is less than 80 g. Dimensional parameters are optimized to simplify the design process and to identify effective factors for locomotion. Potential locomotion modes of the robot are analyzed by dynamics simulation. A simplified virtual prototype is tested within the multibody simulation software. An experimental platform of the monobot is also developed. The speed of the platform is adjusted to verify the correspondence between the actuator speed and locomotion mode as obtained by simulation. Potential applications of the multi-mode monobot include disaster rescue, planet exploration, and reconnaissance.

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