Showing papers on "Vehicle engineering published in 2015"

Australian journal of basic and applied sciences(ajbas)

Abstract: Agricultural Sciences Applied Biology Civil Engineering Applied Physics All fields of Engineering Applied chemistry Astronology Marine Sciences Applied Mathematics Artificial Intelligence Atmospheric Sciences Automatic Control Automotive Engineering Medicine Research Medical Technology Medical Sciences Chemical Engineering Chemistry Civil Engineering Information Technology Telecommunication Engineering Computer Databases & Software Construction Electrical Engineering Electronics Engineering Control Engineering Computer Systems Engineering Animal and Veterinary Sciences Biomedical Materials Energy Resources & Research Environmental Engineering Fire & Fire Prevention Food & Food Industry Geology Industrial Engineering Machine Learning Machinery Marine Technology Mechanical Engineering Metallurgy Mineralogy Mining Engineering Neural Networks Oceanography Optical & Neural Computing Petroleum & Gas Physics Robotics Solid State Technology Textile Industry & Fabrics Transportation Waste Management Industrial Arts etc Business Administration Commerce Social Science

The Automotive Transmission Book

Abstract: This book presents essential information on systems and interactions in automotive transmission technology and outlines the methodologies used to analyze and develop transmission concepts and designs. Functions of and interactions between components and subassemblies of transmissions are introduced, providing a basis for designing transmission systems and for determining their potentials and properties in vehicle-specific applications: passenger cars, trucks, buses, tractors, and motorcycles. With these fundamentals the presentation provides universal resources for both state-of-the-art and future transmission technologies, including systems for electric and hybrid electric vehicles

Vehicle Dynamics Compendium for Course MMF062

Abstract: This compendium is intended for first-time-studies studies of vehicle dynamics. At Chalmers University of Technology this is in the course “MMF062 Vehicle Dynamics”. The compendium covers more than actually included in the course; both in terms of subsystem designs, which not necessarily has to be fully understood in order to learn the vehicle level; and in terms of some teasers for more advanced studies of vehicle dynamics. Therefore, the compendium can also be useful in general vehicle engineering courses, e.g. in the Chalmers course “TME121 Engineering of Automotive Systems”; and as an introduction to more advance courses, which at Chalmers is the course “TME102 Vehicle Dynamics Advanced”. The overall objective of the compendium is to contribute to education of automotive engineers with good skills to design for, and verify, requirements on complete vehicle level functions, regarding vehicle dynamics or motion. The compendium focus on road vehicles, both passenger cars and commercial vehicles. Smaller road vehicles, such as bicycles and single-person cars, are only very briefly mentioned. It should be mentioned that a lot of ground-vehicle types are not covered at all, such as: off-road/construction vehicles, tracked vehicles, horse wagons, hovercrafts or railway vehicles.

Evaluation of different heat transfer conditions on an automotive turbocharger

Abstract: This article presents a combination of theoretical and experimental investigations for determining the main heat fluxes within a turbocharger. These investigations consider several engine speeds an...

A numerical study of the influence from architecture on the permeability of 3D-woven fibre reinforcement

Abstract: Various modelling aspects of the permeability of three-dimensional (3D) woven textile preforms are studied using computational fluid dynamics (CFD). The models are built using a recently developed ...

Parameterization and Validation of Road and Driver Behavior Models for CarMaker Simulations and Transmission HIL-Rig

Abstract: The thesis analyzes whether the results from simulation and powertrain rig tests correlate to the actual loads of a vehicle driving in a real transport task. The rig used in the research uses the same software as the simulations, called CarMaker, but when conducting tests in the rig the models of transmission and engine are removed. Instead the actual components are used as Hardware-In-the-Loop (HIL). To be able to get good results from the simulation and rig tests, a representative model of the physical road had to be developed. The driver behavior model had to be parametrized in a way that resembles a real driver. The road used in the thesis is a pre-defined city route in Göteborg, used to resemble normal driving situations which include large amount of accelerations and decelerations, since city driving has the most influence on the durability of the transmission. The road model is built up by using x and y coordinates which describes the physical roads’ choice of path, surface friction and road attributes as speed limits and stop signs. The road model does not mimic the road on a micro but rather a macro scale, meaning that local abnormalities like potholes and stones are not modeled, the limitations are further explained in Section 1.4. The driver model used in the thesis is included in the CarMaker software, therefore the task was to parametrize the model to ensure that it was good representation of actual drivers. The focus when developing driver models was to investigate a defensive, normal and aggressive driver type. In order to shorten lead times and improve the economy of product development, testing and verification of products should be conducted earlier in the development process. An effective way to allow this is by the use of Computer Aided Engineering (CAE) tools. In order to be able to trust the results from the CAE tools, the models used must be trustworthy, which was the main focus of interest during the project. During the thesis, a good correlation of the road model was achieved, both in terms of choice of path and the ability to perform test on the road equally in vehicle, rig and simulation testing. It turned out to be hard to represent a real driver using the driver behaviour model included in the CarMaker software. Instead, possible solutions to this problem is presented by using and developing suitable key indicators, which explain how the driver behaves and the limitations in the CarMaker driver behavior model. The research also showed that a valid vehicle model is crucial for the results. All in all, the results from simulations, rig tests and vehicle tests correlate in a good way. The key indicators span approximately the same span when comparing the different tests. This is valid for both key indicators on transmission shaft fatigue load and energy consumption at drive shafts, which shows on a good potential for future development and use.

A Verified and Validated Model for Simulation-Driven Design of Heavy Duty Truck Synchronizers

Abstract: The strong market trend toward lower fuel consumption for heavy road transports requires more frequent gear shifting and increased gear shift performance, i.e. shorter shift time. Increased shift p ...

Utilisation of optimisation solutions to control active suspension for decreased braking distance

Abstract: This work deals with how to utilise active suspension on individual vehicle wheels in order to improve the vehicle performance during straight-line braking. Through numerical optimisation, solutions have been found as regards how active suspension should be controlled and coordinated with friction brakes to shorten the braking distance. The results show that, for the studied vehicle, the braking distance can be shortened by more than 1 m when braking from 100 km/h. The applicability of these results is studied by investigating the approach for different vehicle speeds and actuator stroke limitations. It is shown that substantial improvements in the braking distance can also be found for lower velocities, and that the actuator strokes are an important parameter. To investigate the potential of implementing these findings in a real vehicle, a validated detailed vehicle model equipped with active struts is analysed. Simplified control laws, appropriate for on-board implementation and based on knowledge of the optimised solution, are proposed and evaluated. The results show that substantial improvements of the braking ability, and thus safety, can be made using this simplified approach. Particle model simulations have been made to explain the underlying physical mechanisms and limitations of the approach. These results provide valuable guidance on how active suspension can be used to achieve significant improvements in vehicle performance with reasonable complexity and energy consumption.

Using a Principal-Agent Model to Investigate Delegation in Systems Engineering

Abstract: Delegation of decision authority is a fundamental characteristic of systems engineering problems. Engineers and managers at higher levels within the organization allocate responsibility and resources to other individuals through requirements flowdown and other processes. The prevalence of schedule slippages and budget overruns on systems engineering projects raises questions about the adequacy of and potential to improve existing methods. However, at present the community lacks a foundational understanding of these processes that would be valuable in identifying and validating candidate improvements to the systems engineering process. In this paper, we develop a conceptual modeling framework for delegation in systems engineering based on the principal-agent problem, a game-theoretic model of agent interaction across hierarchical levels. Several variations on the basic model are possible. We study the model and its variations on an illustrative example of a passenger vehicle engineering process. Numerical results highlight the impact of various assumptions, including whether engineers act normatively or according to proposed behavioral decision models. Implications and extensions are discussed, including the need for behavioral validation of engineering decision models and the potential to use the modeling framework to evaluate newly proposed delegation schemes.Copyright © 2015 by ASME

Electric Power Assist Steering System Parameterization and Optimisation Employing Computer-Aided Engineering

Abstract: The automotive industry strives to develop high quality vehicles in a short period of time that satisfy the consumer needs and stand out in the competition. Full exploitation of simulation and Comp ...

Multi agent system optimization in virtual vehicle testbeds

Abstract: Modelling, simulation, and optimization play a crucial role in the development and testing of autonomous vehicles. The ability to compute, test, assess, and debug suitable configurations reduces the time and cost of vehicle development. Until now, engineers are forced to manually change vehicle configurations in virtual testbeds in order to react to inappropriate simulated vehicle performance. Such manual adjustments are very time consuming and are also often made ad-hoc, which decreases the overall quality of the vehicle engineering process. In order to avoid this manual adjustment as well as to improve the overall quality of these adjustments, we present a novel comprehensive approach to modelling, simulation, and optimization of such vehicles. Instead of manually adjusting vehicle configurations, engineers can specify simulation goals in a domain specific modelling language. The simulated vehicle performance is then mapped to these simulation goals and our multi-agent system computes for optimized vehicle configuration parameters in order to satisfy these goals. Consequently, our approach does not need any supervision and gives engineers visual feedback of their vehicle configuration expectations. Our evaluation shows that we are able to optimize vehicle configuration sets to meet simulation goals while maintaining real-time performance of the overall simulation.

On Evaluation and Modelling of Human Exposure to Vibration and Shock on Planing High-Speed Craft

Abstract: High speed in waves, necessary in for instance rescue or military operations, often result in severe loading on both the craft and the crew. To maximize the performance of the high-speed craft (HSC ...

An Integrated Systems Engineering Method for Conceptual Design of Vehicle Handling Dynamics

Abstract: The handling characteristics of road vehicles are important attributes that define a major part of its unique selling proposition. The engineering process of tuning vehicle handling dynamics is a challenging process due to the multitude of competing design requirements/parameters and requires a well-defined systematic approach. The primary objective of this publication is to describe an integrated system engineering method for the conceptual design of vehicle handling dynamics early in the product development process. A systems engineering-based simulation framework is described that connects subjective, customer-relevant handling expectations to higher-level, objective vehicle engineering targets and consequently breaks these targets down into subsystem-level requirements and component-level design specifications. A case study supporting this proposed system engineering method for vehicle handling design is also described in detail. The integrated systems engineering approach guides the engineering development process and provides insight into the compromises involved in vehicle handling layout, ultimately saving product development time and costs and helping to achieve a higher level of product maturity early in the design phase.

Modelling and experimental evaluation of driver behaviour during single wheel hub motor failures

Abstract: A failure-sensitive driver model has been developed in the research study presented in this paper. The model is based on measurements of human responses to dierent failure conditions inuencing the ...

Recyclable self-reinforced ductile fiber composite materials for structural applications

Abstract: Lightweight structures in vehicles are a proven way to reduce fuel consumption and the environmental impact during the use. Lower structural weight can be achieved by using high performance materia ...

Estimating the damage and marginal cost of different vehicle types on rail infrastructure: combining economic and engineering approaches

Abstract: EU legislation requires that European infrastructure managers set access charges based on the marginal cost of running trains on their networks. Two methods have been used in the literature for thi ...

Computational weld mechanics : Towards simplified and cost effective FE simulations

Abstract: It is the demand of the world’s ever increasing energy crisis to reduce fuel consumption wherever possible. One way of meeting this demand is by reducing the weight of a structure by replacing thic ...

Multi Agent System Optimization in Virtual Vehicle Testbeds

Abstract: Modelling, simulation, and optimization play a crucial role in the development and testing of autonomous vehicles. The ability to compute, test, assess, and debug suitable configurations reduces the time and cost of vehicle development. Until now, engineers are forced to manually change vehicle configurations in virtual testbeds in order to react to inappropriate simulated vehicle performance. Such manual adjustments are very time consuming and are also often made ad-hoc, which decreases the overall quality of the vehicle engineering process. In order to avoid this manual adjustment as well as to improve the overall quality of these adjustments, we present a novel comprehensive approach to modelling, simulation, and optimization of such vehicles. Instead of manually adjusting vehicle configurations, engineers can specify simulation goals in a domain specific modelling language. The simulated vehicle performance is then mapped to these simulation goals and our multi-agent system computes for optimized vehicle configuration parameters in order to satisfy these goals. Consequently, our approach does not need any supervision and gives engineers visual feedback of their vehicle configuration expectations. Our evaluation shows that we are able to optimize vehicle configuration sets to meet simulation goals while maintaining real-time performance of the overall simulation.

Modelling and experimental verification of a secondary controlled six-wheel pendulum arm forwarder

Abstract: One of the major concerns in the forest industry is the impact on the soil caused by the forest machines duringharvesting, where damages can have a negative impact on e.g. further growth. One of th ...

Development of an engineering simulator for armored vehicle

Abstract: This paper illustrates the main features and structure of the armored vehicle engineering simulator (AVES). Considering high cost and long cycle development problem of the traditional armored vehicle design, the AVES has been developed for purposes to test rationality of design, to investigate different parameter effects on vehicle performance, to study man-machine efficacy in kinds of situation, to train crews. The AVES is made up of eight components, including vehicle dynamics, motion platform, visual simulation, sound effect, cockpit, man-machine interface, vibration seat and main console. High Level Architecture (HLA) pRTI and TCP/IP protocol is used to connect each component to exchange data and ensure real-time capability and synchronization of the AVES. Armored vehicle multi body dynamics model established by Vortex is reusable and modular to set up different vehicle. Motion platform is a classic Stewart platform driven by hydraulic system, which provides six degrees of freedom motion for crews. Visual simulation 3D model is built in Creator, rendered by VegaPrime to display on monitors in AVES. Man-machine interface and vibration seat is arranged in cockpit for crews operation. The development of the AVES can not only provide a platform for new vehicle design and performance evaluation, but also make further research on man-machine efficacy.

Modeling and simulation for powertrain design and control of unconventional vehicles

Abstract: The aim of this paper is to propose a methodology of modeling and simulation of electrical vehicles (EV) for design and control of their powertrain. On the base of this method, new software tool which is called ELEctric VEhicle Simulator (ELEVES) has been developed in Delphi environment with a Pascal code. It provides the vehicle engineering community with an easy-to-use, flexible, yet robust and supported analysis package for electric vehicles modeling. It uses the Component Hybrid Dynamic Nets (CHDN) to graphically present and extract the equations of studied system. CHDN allow every component of electric vehicle architecture to be individually modeled and then represented in software library. Finally, an example of application is treated in order to highlight ELEVES's ability to design and control electrical components of EV. This study concerns the two in-wheel drives EV with speed control of vehicle. The obtained results have been compared with those of Matlab/Simulink in order to validate our software.

Scenario based development of a wheel profile using numerical optimization

Abstract: Simulation of wheel and rail wear allows to predict long term profile evolution and thus, study the consequences of wheel damage in the dynamic behaviour of the vehicle, or study future maintenanc ...

A tyre model for energy studies in vehicle dynamics simulations

Abstract: This study aim to develop a three dimensional multi-line brush based tyre model for investigating the rolling resistance and energy loss in tyres. The losses in the model are characterised by the external losses originated from the sliding phenomenon in the tyre contact patch, and the internal losses due to the tyre viscoelastic nature which is employed by a rubber model. The Extended Brush tyre Model (EBM) proposed in this work can be used to estimate the dissipated energy and the rolling resistance under different driving manoeuvres and wheel conditions. This paper focuses on the estimation of energy loss and in-plane rolling resistance.

Monitoring of the lubrication system of an aircraft engine through a Prognostic and Health Monitoring approach

Abstract: Monitoring of the lubrication system of an aircraft engine through a Prognostic and Health Monitoring approach

Structural engineering, vibration and aerospace engineering II : selected, peer reviewed papers from the 2014 2nd International Conference on Structural Engineering, Vibration and Aerospace Engineering (SEVAE 2014), November 15-16, 2014, Shenzhen, China

Abstract: The 70 papers are grouped as follows: Chapter 1: Structural Engineering and Materials, Civil Engineering Chapter 2: Vibration Engineering and Noise, Analysis and Dynamics Chapter 3: Aerospace and Aircraft Engineering, Testing and Fault Diagnosis, Computational Methods Chapter 4: Disaster Prevention and Mitigation.