Passenger Comfortability Studies of Electric Vehicle under ISO-2631 Criteria

2014 ◽  
Vol 699 ◽  
pp. 975-980
Author(s):  
Wibowo ◽  
Ubaidillah ◽  
Ipnu Candra ◽  
Muhammad Nizam
Keyword(s):  
Electric Vehicle ◽  
Degrees Of Freedom ◽  
Excitation Frequency ◽  
Dynamic Responses ◽  
Stiffness Coefficient ◽  
Vehicle Model ◽  
Passive Suspension ◽  
Suspension Stiffness ◽  
Passive Suspension System ◽  
Iso 2631

The study focuses on the vertical, longitudinal and lateral responses of ride performance of an electric vehicle. Issues related to the design of vehicle model with passive suspension system are discussed. A full-car seven-degrees-of-freedom model is used to investigate the dynamic responses by applying road disturbances in sinusoidal road input excitation. Frequency response of the heave, roll and pitch of the sprung mass is obtained for the need of studying the effects of given variations of the suspension stiffness coefficient and the suspension damping coefficient. Finally, using the ISO-2631 criteria, the result of the responses in frequency domain are evaluated to evaluate the passenger comfortability.

A Fractional Derivative Model for Rubber Spring of Primary Suspension in Railway Vehicle Dynamics

2017 ◽  
Vol 3 (3) ◽  
Author(s):  
Dawei Zhang ◽  
Shengyang Zhu
Keyword(s):  
Fractional Derivative ◽  
Degrees Of Freedom ◽  
Excitation Frequency ◽  
Coupled System ◽  
Dynamic Responses ◽  
Viscous Force ◽  
Railway Vehicle ◽  
Spring Model ◽  
The Difference ◽  
Amplitude Dependency

This paper presents a nonlinear rubber spring model for the primary suspension of the railway vehicle, which can effectively describe the amplitude dependency and the frequency dependency of the rubber spring, by taking the elastic force, the fractional derivative viscous force, and nonlinear friction force into account. An improved two-dimensional vehicle–track coupled system is developed based on the nonlinear rubber spring model of the primary suspension. Nonlinear Hertz theory is used to couple the vehicle and track subsystems. The railway vehicle subsystem is regarded as a multibody system with ten degrees-of-freedom, and the track subsystem is treated as finite Euler–Bernoulli beams supported on a discrete–elastic foundation. Mechanical characteristic of the rubber spring due to harmonic excitations is analyzed to clarify the stiffness and damping dependencies on the excitation frequency and the displacement amplitude. Dynamic responses of the vehicle–track coupled dynamics system induced by the welded joint irregularity and random track irregularity have been performed to illustrate the difference between the Kelvin–Voigt model and the proposed model in the time and frequency domain.

scholarly journals Dynamic responses of vehicle ballasted track interaction system for heavy haul trains

2018 ◽  
Vol 148 ◽  
pp. 05004
Author(s):  
Yingjie Wang ◽  
Zuzana Dimitrovová ◽  
Jong-Dar Yau
Keyword(s):  
Degrees Of Freedom ◽  
Field Experiments ◽  
Moving Load ◽  
Dynamic Responses ◽  
Contact Model ◽  
Vehicle Model ◽  
Track System ◽  
Ballasted Track ◽  
Heavy Haul ◽  
Heavy Haul Trains

In this study, the dynamic responses of ballasted tracks subjected to heavy haul trains are investigated. The vehicle ballasted track interaction (VTI) model can be divided into three parts, which are vehicle model, ballasted track model and wheel/rail contact model. The vehicle is modelled as a multi-body system with 10 degrees of freedom. The ballasted track consisting of rail, sleeper, ballast, sub-ballast and sub-grade is modelled as four elastic components. The vehicle model and ballasted track model is linked by the wheel/rail contact model, which is determined by the nonlinear Hertzian theory. The VTI model is solved by an iterative procedure and validated with some field experiments. The dynamic responses of the vehicle/track system are compared with those from the moving load model. Moreover, the wheel/rail contact force, the force from rail to sleeper and the force from sub-ballast to subgrade are computed for different axle loads of 25t, 30t, 35t and 40t. It is deduced that maximum values of these forces increase in a linear form with the increasing of axle load.

Shimmy model for electric vehicle with independent suspensions

2017 ◽  
Vol 232 (3) ◽  
pp. 330-340 ◽  
Author(s):  
Tian Mi ◽  
Gabor Stepan ◽  
Denes Takacs ◽  
Nan Chen
Keyword(s):  
Electric Vehicle ◽  
Degrees Of Freedom ◽  
Initial Conditions ◽  
Structural Parameters ◽  
Contact Point ◽  
Dynamic Responses ◽  
Simulation Results ◽  
The Stability ◽  
Linearized Model ◽  
Wheel Shimmy

A 5-degrees-of-freedom shimmy model is established to analyse the dynamic responses of an electric vehicle with independent suspensions. Tyre elasticity is considered by means of Pacejka’s magic formula. Under the nonslip assumption for the leading contact point, tyre–road constraint equations are derived. Numerical simulation is conducted with different structural parameters and initial conditions to observe the shimmy phenomenon. Simulation results indicate that Hopf bifurcation occurs at a certain vehicle forward speed. Moreover, suspension structural parameters, such as caster angle, affect wheel shimmy. The linearized model of the system presents the stability boundaries, which agree with the simulation results. The results of this study not only provide a theoretical reference for shimmy attenuation, but also validate the effectiveness of the provided model, which can be used in further dynamic analysis of vehicle shimmy.

scholarly journals Driving Safety Improved with Control of Magnetorheological Dampers in Vehicle Suspension

2020 ◽  
Vol 10 (24) ◽  
pp. 8892
Author(s):  
Piotr Krauze ◽  
Jerzy Kasprzyk
Keyword(s):  
Degrees Of Freedom ◽  
Aerodynamic Drag ◽  
Mr Damper ◽  
Driving Safety ◽  
Vehicle Body ◽  
Control Algorithms ◽  
Magnetorheological Dampers ◽  
Vehicle Model ◽  
Passive Suspension ◽  
Non Linear

The article is dedicated to the control of magnetorheological dampers (MR) included in a semi-active suspension of an all-terrain vehicle moving along a rough road profile. The simulation results of a half-car model and selected feedback vibration control algorithms are presented and analysed with respect to the improvement of driving safety features, such as road holding and vehicle handling. Constant control currents correspond to the passive suspension of different damping parameters. Independent Skyhook control of suspension parts represents the robust and widely used semi-active algorithm. Furthermore, its extension allows for the control of vehicle body heave and pitch vibration modes. Tests of the algorithms are carried out for a vehicle model that is synthesised with particular emphasis on mapping different phenomena occurring in a moving vehicle. The coupling of the vehicle to the road and environment is described by non-linear tire-road friction, rolling resistance, and aerodynamic drag. The pitching behaviour of the vehicle body, as well as the deflection of the suspension, is described by a suspension sub-model that exhibits four degrees of freedom. Further, three degrees of freedom of the complete model describe longitudinal movement of the vehicle and angular motion of its wheels. The MR damper model that is based on hyperbolic tangent function is favoured for describing the key phenomena of the MR damper behaviour, including non-linear shape and force saturation that are represented by force-velocity characteristics. The applied simulation environment is used for the evaluation of different semi-active control algorithms supported by an inverse MR damper model. The vehicle model is subjected to vibration excitation that is induced by road irregularities and road manoeuvres, such as accelerating and braking. The implemented control algorithms and different configurations of passive suspension are compared while using driving-safety-related quality indices.

Simulation of Quarter-Car Model with Magnetorheological Dampers for Ride Quality Improvement

2018 ◽  
Vol 10 (3) ◽  
Author(s):  
Sunil Kumar Sharma ◽  
Rakesh Chandmal Sharma
Keyword(s):  
Degrees Of Freedom ◽  
Active Suspension ◽  
Suspension System ◽  
Ride Quality ◽  
Bingham Model ◽  
Passive Suspension ◽  
Quarter Car Model ◽  
Car Model ◽  
Passive Suspension System ◽  
Quarter Car

A semi-active suspension system using Magnetorheological (MR) damper overcomes all the inherent limits of passive and active suspension systems and combines the advantages of both. This paper gives a concise introduction to the suspension system of a passenger vehicle which is presented along with the analysis of semi-active suspension system using MR fluid dampers based on Bingham model. MR dampers are filled with MR fluids whose properties can be controlled by applying voltage signal. To further prove the statement, a quarter car model with two degrees of freedom has been used for modeling the suspension system the sprung mass acceleration of passive suspension system has been compared with the semi-active suspension system using the Bingham model for MRF damper. Simulink/MATLAB is used to carry out the simulation. The results drawn show that the semi-active suspension system performed better than the passive suspension system in terms of vehicle stability.

Application Research on Elastomer Damper in Tracked Vehicle Suspension System

2011 ◽  
Vol 138-139 ◽  
pp. 193-198
Author(s):  
Zhong Si Xu ◽  
Tie Xiong Su ◽  
Gang Li ◽  
Kai Wang
Keyword(s):  
Degrees Of Freedom ◽  
Suspension System ◽  
Dynamics Simulation ◽  
Vehicle Suspension ◽  
Application Research ◽  
Tracked Vehicle ◽  
Passive Suspension ◽  
Passive Suspension System ◽  
System Breakdown ◽  
Vehicle Suspension System

Because traditional passive suspension system can’t meet with the requirement of ride in all kinds of roads, elastomer damper was designed and installed on the limiting stopper of the suspension system. Two degrees of freedom model of suspension system with elastomer damper was built and its dynamics simulation was done by use of the software Recurdyn. The simulation results show that the application of elastomer damper can improve the ride of tracked vehicle; the striking force apparently decreases when suspension system has broken down and the probability of suspension system breakdown has been obviously reduced, all of which illustrates the elastomer damper has an obvious dampening effect on the tracked vehicle. Keywords: elastomer damper, tracked vehicle, suspension system, dynamics simulation

scholarly journals The use of a linear half-vehicle model for the optimization of damping in the passive suspension system of a railway car

2016 ◽  
Vol 39 (3) ◽  
pp. 31-49 ◽  
Author(s):  
Zbigniew Lozia ◽  
Ewa Kardas-Cinal
Keyword(s):  
Suspension System ◽  
Motor Vehicles ◽  
Railway Vehicle ◽  
Vehicle Model ◽  
Passive Suspension ◽  
Linear Damping ◽  
Passive Suspension System ◽  
Secondary Suspension ◽  
Stiffness And Damping ◽  
Selection Of

The paper presents a methodology of optimizing the parameters of the passive suspension system of a railway vehicle. A linear half-vehicle model and an example of the procedure carried out to optimize a selected parameter of the model have been demonstrated. A method of the selection of damping in the suspension system of a railway vehicle, based on over 40-year achievements of the cited authors of publications in the field of motor vehicles, has been shown. The optimization of linear damping in the secondary suspension system of a passenger carriage moving on a track with random profile irregularities has been described in detail. The algorithms adopted for the calculations have a wider range of applicability; especially, they may be used for determining the optimum values of the other parameters of the railway vehicle model under analysis, i.e. stiffness of the secondary suspension system as well as stiffness and damping of the primary suspension system.

scholarly journals SIMULATING PASSIVE SUSPENSION ON AN UNEVEN TRACK SURFACE

2017 ◽  
Vol 20 (1) ◽  
Author(s):  
FLORIN ANDRONIC ◽  
IOAN MIHAI ◽  
IOAN-COZMIN MANOLACHE-RUSU ◽  
LILIANA PĂTULEANU ◽  
IVAN RADION
Keyword(s):  
Degrees Of Freedom ◽  
Suspension System ◽  
Driving Safety ◽  
Passive Suspension ◽  
Quarter Car Model ◽  
Suspension Systems ◽  
Automobile Suspension ◽  
Passive Suspension System ◽  
Track Surface ◽  
Simulation Scheme

<p>Automobile suspension systems have an important role in a vehicle's functioning, especially with regard to driving safety. In the present paper we exhibit the equations that characterize a passive suspension system. Considering that solving the equations is extremely cumbersome we developed a simulation scheme in MATLAB Simulink. The simulation allows for an analysis of the behavior of the passive suspension system on any uneven track surface whose configuration is ensured by stimulus signals. For the simulation we used the quarter car model. The suspension was chosen as having two degrees of freedom. </p>

Comparison of Control Strategies Applied to Nonlinear Quarterly Car Passive Suspension System

2015 ◽  
Vol 8 (3) ◽  
pp. 203
Author(s):  
Muhammad Sani Gaya ◽  
Amir Bature ◽  
Lukman A. Yusuf ◽  
I. S. Madugu ◽  
Ukashatu Abubakar ◽  
...  
Keyword(s):  
Control Strategies ◽  
Suspension System ◽  
Passive Suspension ◽  
Passive Suspension System
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