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Integrated public transportation systems: An evaluation of the underlying communications systems issues

Coventry University and PFCE Ltd.-P. Foyer
University of Wolverhampton-C. Nwagboso
  • Technical Paper
  • 2000-25-0154
Published 2000-09-25 by ISATA - Dusseldorf Trade Fair in United Kingdom
The provision of accessible, reliable, safe and easily purchased multi-modal passenger journeys has been a dream for politicians and public alike for many years. In fact, progress has been slow, especially where off-system enquiry, payment and any involvement with private transport have been concerned.Some of the problems have been territorial and totally indefensible. However, deeper investigation of the many domains to be addressed in providing a seamless service shows that the sheer number of different domains to be linked and integrated leads to serious technical, process and commercial problems.Modern communications, such as the Internet, present better solutions to the technical problem. The process issues in allowing a seamless travel experience from enquiry, through booking to in-journey help and security, to arrival are far from solved. The proper process of supporting the traveler in the private transport sectors of the journey and organizing the necessary services and communications has virtually been ignored.Key solutions will include: "network user" interfaces and aids to improve the quality for the travel/consignor from planning to completion of either a "good" or…

Design, analysis and calculation of the structure of a clean urban bus

University of Zaragoza-J. M. Bielsa, E. Larrodé, A. Miravete, L. Castejón, J. Cuartero, J. Callén, L. M. Lanzán
  • Technical Paper
  • 2000-25-0158
Published 2000-09-25 by ISATA - Dusseldorf Trade Fair in United Kingdom
In this paper, it is intended to show the analysis and calculation of the structure of a clean urban bus. The design is based on a power system that uses hydrogen or natural gas, and where the main storage capacitors are situated in the upper part of the structure of the bus. This new design is intended to be lighter, due to the rising weight introduced by the storage capacitors. The objective is therefore, to develop a new design able to reduce the maximum weight of the structure, within the limits permitted by the current legislation, and therefore to maintain the load capacity. Due to the position of the load on the upper part of the structure of the bus, the rest of the structure must be strong enough to bear all the stresses caused by this new distribution of loads.The analysis and calculation has been done by using a finite element code called ABAQUS/Standard. Several analyses regarding strength and stiffness were carried out from the main static models of load (flexural and torsion), sufficient…

Transient analysis of cam-tappet friction in an internal combustion engine

Ecole Centrale de Lyon-J.-C. Champoussin
INSA de Lyon-A. A. Lubrecht
  • Technical Paper
  • 2000-25-0046
Published 2000-09-25 by ISATA - Dusseldorf Trade Fair in United Kingdom
The stringent legislation on car emissions leads to an intensive research on the fuel consumption reduction. In order to pursue this trend, all frictional losses in an internal combustion engine must be reduced. To accomplish this, a better understanding of the behavior of engine components during a cycle is required. This paper focuses on the valve train system. A transient ElastoHydrodynamic Lubrication (EHL) analysis has been performed. A program using Multigrid and multi-integration allows an accurate film thickness calculation with respect to the actual variation of the local speed, the load and geometry. A comparison with the classical theory of Dowson Higginson in quasi steady-state conditions reveals differences especially during reversal of entrainment speed. Based on this accurate film thickness determination, a modified Greenwood Tripp model is developed integrating a local friction coefficient over the contact width at each time step. Comparisons are given for different regimes and different σRMS. The friction coefficient appears to differ at the reversal of entrainment speed and in the nose region.

Managing supplier integration in automotive networks

Research Institute for Operations Management (FIR)-I. Aghte
  • Technical Paper
  • 2000-25-0225
Published 2000-09-25 by ISATA - Dusseldorf Trade Fair in United Kingdom
The continuing drive toward modular and sub-system suppliers in the automotive industry has led to an increased supplier integration with improved development processes and lead times. Many small- and medium-sized suppliers have been left out of this development leading to an overall reduction in the number of suppliers. However, automotive manufacturers and large suppliers have recognized the strategic and operational importance of the co-existence of small and medium suppliers and larger modular or sub-system suppliers.Small- and medium-sized suppliers need to gain market strength as well as R&D and logistics capabilities in order to survive in today''s markets and to contribute to the industry. They will need to improve their business processes in an extent uncommon to their company size. Many will have to engage in cooperation or even a merger with other small and medium suppliers to achieve these objectives. However, a large number of suppliers still lack the concepts and skills to fulfill this task. Enabling these companies to gain vital abilities without taking the high financial and strategic risks connected with acquisitions is…

Experimental validation of a driveline numerical model for the study of vibrational comfort of a vehicle

Fiat Auto-R. Mascellini, L. Pilo
Università di Firenze-R. Capitani, P. Citti, M. Delogu
  • Technical Paper
  • 2000-25-0050
Published 2000-09-25 by ISATA - Dusseldorf Trade Fair in United Kingdom
In this paper numerical models for the simulation and the experimental evaluation of the driveline from a vehicle with internal combustion, have been developed. In order to evaluate the dynamic coupling between engine and vehicle by the driveline, a code that implements a model with concentrated parameters of the driveline (engine, transmission, clutch, differential, axle shaft and wheels) has been applied. The code is able to measure the torque response, from 6 to 200 Hz. This aspect is particularly important as it has a significant impact on the vibrational comfort of a vehicle.A comparison was performed between the calculation results and the experimental ones relative to the simulation of an acceleration maneuver of the Fiat Punto 75. The comparison between the calculation and experimental data has provided encouraging results and indications to continue during the future activity.

Brazilian automotive supply chains: The case of VW-Sao Carlos

Federal University of Sao Carlos-A. G. Alves Filho, P. E. G. Bento, J. C. Donadone, M. F. Martins, A. Rachid, O. M. S. Truzzi
Methodist University of Piracicaba-R. M. Vanalle
  • Technical Paper
  • 2000-25-0229
Published 2000-09-25 by ISATA - Dusseldorf Trade Fair in United Kingdom
This paper describes first the main characteristics of supply chains in Brazilian automobile industry. Some plants are mentioned to provide some illustration of the new chains implemented. It then discusses some mechanisms used by assemblers to control, partially at least, aspects of price, quality, logistics and technology in the chains. The specific case of Volkswagen - Sao Carlos, an engine assembler plant, and its relationships with some of its suppliers, is used to give details of how some mechanisms contribute to increase assembler''s control. The general pattern of those new chains is that the movement of assemblers to higher proportions of parts and services outsourcing has not compromised their control over main bargain variables in supply chains.

High pressure hydrogen storage for fuel cell vehicles

Lincoln Composites-D. B. Tiller, P. E. N. L. Newhouse, J. A. Eihusen
  • Technical Paper
  • 2000-25-0014
Published 2000-09-25 by ISATA - Dusseldorf Trade Fair in United Kingdom
The future use of hydrogen as a vehicular fuel will require a safe and cost- effective means of on-board storage. This physical storage may be accomplished in the form, or state, or compressed gas or as a cryogenic liquid. To achieve a vehicle range comparable to a gasoline-powered vehicle will require storing gaseous hydrogen at pressures up to 35 MPa. High-strength composite materials will be necessary in order to achieve such pressures without incurring a huge weight penalty. The Natural Gas Vehicle (NGV) storage technology is serving as a springboard for on-board hydrogen storage.In 1998, Lincoln Composites, a division of Advanced Technical Products, began testing and delivery of the first all-composite, high-pressure tanks for storage of hydrogen on fuel cell vehicles. This paper discusses the evolution and development of high-pressure hydrogen storage. In particular, this paper presents the performance requirements, design approach, and testing for these initial hydrogen storage containers, and discusses the ongoing work towards development of higher-pressure storage and an industry standard. Also discussed are issues relating to other tank components such as…

Development of "KeyFree" system

Daihatsu Motor Co. Ltd.-H. Kawasaki, Y. Okada
Tokai Rika Co., Ltd.-Y. Yoshida
  • Technical Paper
  • 2000-25-0193
Published 2000-09-25 by ISATA - Dusseldorf Trade Fair in United Kingdom
Daihatsu Motor Co., Ltd., has developed an electronic card "KeyFree" system for the new model "Naked." We are the first company to introduce the electronic card keyless system in Japan. This outline paper explains the "KeyFree" system and its future.

Closed-loop yaw control of vehicles using controllable dampers and roll bars

Delphi Automotive Systems-M. O. Bodie
  • Technical Paper
  • 2000-25-0197
Published 2000-09-25 by ISATA - Dusseldorf Trade Fair in United Kingdom
The potential of controllable suspensions in directly affecting yaw motion of a vehicle is analyzed and tested. Continuously variable magneto rheological (MR) dampers and active roll bars are used to distribute the roll-resisting moments between front and rear suspensions, so as to bring the actual (measured) vehicle yaw rate as close as possible to the desired yaw rate. The available control authority for each of the suspension systems, in terms of ability to generate corrective yaw moment, is evaluated. The results of simulations are then presented for vehicles equipped with MR dampers, active roll bars, and both. The effects of transient and steady-state roll couple distributions on vehicle yaw response are examined using open-loop and closed-loop yaw control. Finally, the results of vehicle tests for a midsize sedan with continuously variable MR suspension are presented. They validate the results of simulation and demonstrate benefits of the proposed control method, in terms of improved emergency handling, stability, and reduced driver steering effort.

Structural analysis of an exhaust system for heavy trucks

debis humaitá IT Services Latin America-N. Vasconcellos, F. dos Anjos, M. Argentino
  • Technical Paper
  • 2000-25-0121
Published 2000-09-25 by ISATA - Dusseldorf Trade Fair in United Kingdom
The present work describes the use of computer simulation supported by experimental data on the design process of an exhaust system for heavy-duty commercial trucks, with regard to structural behavior.A finite element model was generated including the complete vehicle and the exhaust system. Static and dynamic analyses were performed simulating different loading conditions and system configurations.The results obtained assures the structural integrity of the exhaust system and also contribute to a better understanding of this system behavior and its structural strength.