Showing papers on "Vehicle engineering published in 2013"

An experimental study of mechanisms behind wrinkle development during forming of composite laminates

Abstract: A general problem when forming quasi-isotropic, multilayer unidirectional (UD) prepreg over a double curved geometry is out-of-plane wrinkling. The presented study aims to show the existence of com ...

Automotive Systems Engineering

Abstract: This book is the second volume reflecting the shift in the design paradigm in automobile industry. It presents contributions to the second and third workshop on Automotive Systems Engineering held in March 2013 and Sept. 2014, respectively. It describes major innovations in the field of driver assistance systems and automated vehicles as well as fundamental changes in the architecture of the vehicles.

Links between subjective assessments and objective metrics for steering and driver rating evaluation

Abstract: During development of new vehicles finding correlation links between subjective assessments and objective metrics is an important part in the vehicle evaluation process. Studying different correlat ...

Demonstration of Air-Fuel Ratio Role in One-Stage Turbocompound Diesel Engines

Abstract: A large portion of fuel energy is wasted through the exhaust of internal combustion engines. Turbocompound can, however, recover part of this wasted heat. The energy recovery depends on the turbine ...

Temperature Estimation of Turbocharger Working Fluids and Walls under Different Engine Loads and Heat Transfer Conditions

Abstract: Turbocharger performance maps, which are used in engine simulations, are usually measured on a gas-stand where the temperatures distributions on the turbocharger walls are entirely different from t ...

Multi-Functional Composite Design Concepts for Rail Vehicle Car Bodies

Abstract: Structures and material combinations, tailored for multiple purposes, are within the reach of vehicle manufacturers. Besides reducing the environmental impact of the transportation sector these mul ...

Characterisation and Utilisation of Steering Feel in Heavy Trucks

Abstract: Steering is next to braking the most important control feature of a road vehicle. The driver gives input through the steering wheel and the vehicle reacts in a certain way, which results in a trans ...

A Refined Vehicle Dynamic Model for Driving Simulators

Abstract: Driving simulators play an important role in the automotive field, especially in the research about human factors and in the development of driving assistance systems. For this reason, driving experience should be as close as possible to reality. The mathematical model, describing vehicle dynamics, plays a fundamental part in providing this “reality feel”, since it is used by the simulator to compute vehicle motion. This Master´s thesis has the aim of refining an existing vehicle dynamic model for a driving simulator, developed in Modelica ® programming language, in order to make the driving experience closer to reality. In particular, this work is focused into two areas: the first concerns the development of vertical dynamics, in order to extend the degrees of freedom of the vehicle model from ten to fourteen. The second is related to the development of a more accurate steering system model, for both improving the steering feel and the steering dynamics. The vehicle model has been validated through different steps. First of all, its response to different manoeuvres has been compared with the one provided by a real car. This comparison has been made by confronting the model data with the real vehicle ones, coming from test track measurements. Then the model has been tested in the simulator by different drivers, who had to evaluate its behaviour

Exploring active camber to enhance vehicle performance and safety

Abstract: The aim of this study is to evaluate optimal active camber strategies for improvement of vehicle performance and safety during limit handling. Numerical optimisation is used to find solutions on ho ...

Design and development of a composite automotive anti-roll bar

Abstract: An analytical elasticity model is developed for laminated cylindrically anisotropic cylinders subjected to extension, bending, pressure, torsion, and transverse shearing. The model predicts the elastic response of thin or thick walled tubes as well as cylinders, and accounts for all elastic coupling present in the aforementioned loading cases. This model is incorporated into analysis software that predicts the linearelastic response of a composite automotive anti-roll bar. The user may input the bar’s two-dimensional geometry, fibre-layup, diameter, and material properties. A filament-wound composite anti-roll bar is designed to act as a lightweight drop-in replacement for the high-performance steel anti-roll bar that is thoroughly benchmarked herein. A mass reduction of 63% is observed when comparing the structural composite bar design to the existing steel bar.

Simulation-based assessment of HSC crew exposure to vibration and shock

Abstract: A simulation-based method for assessment of HSC crew vibration and shock exposure is presented. The simulation scheme includes three modules: Craft response module, Seat response module and Human e ...

Advanced technologies in manufacturing, engineering and materials : selected, peer reviewed papers from the 2013 International Forum on Mechanical and Material Engineering (IFMME 2013), June 13-14, Guangzhou, China

Abstract: This is a collection of selected, peer reviewed papers from the 2013 International Forum on Mechanical and Material Engineering (IFMME 2013), June 13-14, Guangzhou, China. The 406 papers are grouped as follows: Chapter 1: Dynamic Systems, Vibration and Noise, Applied Mechanics; Chapter 2: Design and Modelling in Manufacture, Dynamic Simulation, Machinery and Equipments; Chapter 3: Fluid, Flow Engineering and Control Technology, Aerodynamics, Wind and Heat Engineering; Chapter 4: Vehicle Engineering; Chapter 5: Material Science and Technology; Chapter 6: Material Processing Technology, Forming, Welding and Joint Technologies, Surface and Coating Engineering; Chapter 7: Material Design and Experiment Researches Analysis, Testing and Evaluation; Chapter 8: Advanced Manufacturing Technology and Mechatronics; and, Chapter 9: Control Technology and Automation Systems. It also includes: Chapter 10: Sensors, Measurement, Detection and Intelligent Information and Data Processing, Fault Diagnosis; Chapter 11: Communication and Signal Engineering; Chapter 12: Computer and Information Technologies Applications in Industry and Engineering, Electric and Power Engineering Applications; Chapter 13: The Internet of Things Technologies; and, Chapter 14: Industrial, Management and Education Engineering.

Faults and their influence on the dynamic behaviour of electric vehicles

Abstract: The increase of electronics in road vehicles comes along with a broad variety of possibilitiesin terms of safety, handling and comfort for the users. A rising complexityof the vehicle subsystems an ...

On Rail Vehicle Dynamics in Unsteady Crosswind Conditions : Studies Related to Modelling, Model Validation and Active Suspension

Abstract: Crosswind stability of rail vehicles has been a research area for several decades, mainlymotivated by vehicle overturning accidents and higher speeds, but in recent times also byissues of lower ene ...

Towards a method for determining maximum oversteer in slippery conditions

Abstract: Fatal accidents during winter time in Sweden are to a large extent due to vehicle spinning. Therefore, it is crucial to analyse and compare vehicle/tyre performance on slippery roads with respect t ...

On Structural Design of High-Speed Craft

Abstract: The development in structural design and construction of high-speed craft has been extensive during the last decades. Environmental and economical issues have increased the need to develop more opt ...

The "SUSTRAIL" High Speed Freight Vehicle : Simulation of Novel Running Gear Design

Abstract: As part of the European Commission project ‘SUSTRAIL’ the authors together with other industry and academic partners are designing a freight vehicle optimised for the carriage of high value, low density, time sensitive products. A review of potential engineering innovations has been carried out and a vehicle is being designed based on optimised parameters for this combination of innovative technologies including radial steering, disk braking and optimised bogie frame structure. The results of the selection and optimisation of the running gear are presented heretogether with an assessment of the potential improvement in running behaviour and its impact on the railway system.

Benefits of weight reduction in high speed train operations

Abstract: This paper highlights one of the main issues with light weight sandwich design in high-speed rail vehicles: The benefit of light weighting is said to be marginal when considering high-speed trains. ...

The damper levels influence on vehicle roll, pitch, bounce and cornering behaviour of passenger vehicles - A study in cooperation with Volvo Car Corporation

Abstract: The competition within the automotive industry is increasing. It is therefore important to reduce the resources and time spent on developing new vehicles. A significant part of the development is the chassis tuning which consumes a lot of time and resources. Dampers have a key role in chassis tuning and a better understanding of how the level of damping affects the vehicle behaviour could reduce both the number of prototypes built and the time spent on chassis tuning. This thesis investigates the possibility to develop a tool which captures the vehicle behaviour accurately enough to be used for choosing damper levels in the concept phase and as an aid in the tuning of dampers. A Simulink model was developed together with a graphical user interface allowing the user to easily change the level of damping and run simulations. In order to validate the model and see how changes to the level of damping affect the vehicle behaviour, both subjective and objective tests were performed for different damper configurations. It was found that the changes in vehicle behaviour for the various damper levels had a good correlation between the simulation model and the results from the physical tests. However in absolute numbers differences were found between simulations and objective tests. In order to verify the simulation model a limited number of objective tests are required. The tested vehicle should also be measured properly in order to receive better input data to the simulation model.The study found that the pitch balance in the vehicle is mostly affected by the difference in compression and rebound damping between the front and rear dampers. Lower damping at low vertical wheel velocities has a negative impact on roll control. This can to a limited extent be compensated with higher roll stiffness. A good balance between the front and rear damping is also required in order to have good connection to the road and make the vehicle feel more comfortable. The subjective and objective evaluation showed that it might be the time lag between lateral acceleration and steering wheel angle is a good indication of the vehicles turn-in capabilities and that the roll angle time lag determines the response. However more objective and subjective tests are required in order to confirm this connection. A better understanding of how to define good vehicle behaviour objectively is also required if the tool should be used in the concept phase.

Implementation and evaluation of force allocation control of a down-scaled prototype vehicle with wheel corner modules

Abstract: The implementation of wheel corner modules on vehicles creates new possibilities of controlling wheel forces through the utilisation of multiple actuators and wheel motors. Thereby new solutions fo ...