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Viewing 181 to 210 of 1645
2008-04-14
Technical Paper
2008-01-1256
Xun Dai, Anton Kummert, Su-Birm Park, Uri Iurgel
Automotive radar application is a focus in active traffic safety research activities. And accurate lateral position estimation from the leading target vehicle through radar is of great interest. This paper presents a method based on the regression tree, which estimates the rear centroid of leading target vehicle with a long range FLR (Forward Looking Radar) of limited resolution with multiple radar detections distributed on the target vehicle. Hours of radar log data together with reference value of leading vehicle's lateral offset are utilized both as training data and test data as well. A ten-fold cross validation is applied to evaluate the performance of the generated regression trees together with fused decision forest for each percentage of the training data.
2008-04-14
Technical Paper
2008-01-0200
Francis Dance, Damon Gawley, Robert Hein, Ronald Kates
As the popularity of vehicle navigation systems rises, incorporating Real Time Traffic Information (RTTI) has been shown to enhance the systems' value by helping drivers avoid traffic delays. As an innovative premium automaker, BMW has developed a testing process to acquire and analyze RTTI data in order to ensure delivery of a high quality service and to enhance the customer experience compared to audible broadcast services. With a methodology to obtain valid and repeatable RTTI data quality measurements, BMW and its service partner, Clear Channel's Total Traffic Network (TTN), can improve its offered service over time, implement corrective measures when appropriate, and confidently ensure the service meets its premium objectives. BMW has partnered with TTN and SoftSolutions GmbH to implement a traffic data quality process and software tools.
2008-04-14
Technical Paper
2008-01-0673
Anne Prieur, Frédérique Bouvart, Benoît Gabrielle, Simon Lehuger
The recent development of biofuel production worldwide is closely linked to GHG savings objectives and to regional agricultural policies. Many existing studies intend to evaluate the net non renewable energy and GHG savings associated to the various biofuel production pathways. However, there is no consensus on the results of those studies. The main explanations of variations among the results are the following: energy consumption and GHG emissions of the reference fossil pathway, data used for the representation of farming processes and biofuel production processes, accounting for carbon storage in agricultural soils, reference use of the land, choice of an allocation method in case of coproduction. There is a strong drive in the European Union for a certification on the sustainability of biofuel pathways.
2008-04-14
Technical Paper
2008-01-1252
Guanglin Ma, Anton Kummert, Su-Birm Park, Stefan Müller-Schneiders, Alexander Loffe
In this paper we present a fast symmetry search and filtering algorithm for monocular vision based pedestrian candidate detection application. First the ROI of symmetry search is focused on the pedestrian leg region, where the background is relatively simple ground plane. Afterward, the search region is divided into 2 × 4 sub blocks and symmetry density and distribution of each sub block is calculated. Finally, by comparing the symmetry density and distribution of the sub blocks, the correct symmetry axis of the pedestrian candidate is search and also some no-pedestrian candidates are filtered out. The results shown in this method are fast, cost effective and well suited for real-time vision applications.
2008-04-14
Technical Paper
2008-01-1259
Rene Sosa, Gerardo Velazquez
Developments in electronics and mechanics have improved performance of vehicles in collision, especially during and after the crash, producing injuries and an economical impact to the owner of the vehicle. Lately several projects focused on preventing collision have raised as Active Safety Systems or so called in Europe, Advanced Driving Assistance Systems which have been developed facing the challenge of avoiding collisions. The goal of this project is to design, build and install a system capable of detecting and warning the driver about dangerous obstacles. In case the driver does not react on time the system will slow down the vehicle in order to decrease the collision velocity, or even avoid it. After a careful analysis of different LIDAR and non-vision passive infrared sensors are implemented and explored. This paper proposes a decision model using the combinations of some simple models of the driver, the vehicle, the control unit, and obstacle detection.
2008-04-14
Technical Paper
2008-01-0689
Linda F. Nazar, Si Hyoung Oh
Traditional electrode materials for lithium-ion storage cells are typically crystalline layered structures such as metal oxides, and graphitic carbons. These materials power billions of portable electronic devices in today's society. However, large-scale, high-capacity storage devices capable of powering hybrid electric vehicles (HEV″s) or their plug-in versions (PHEV's) have much more demanding requirements with respect to safety, cost, and the power they must deliver. Recently, nanostructured solid state materials, which are comprised of two more compositional or structural phases, have been found to show exciting possibilities to meet these criteria.
2008-04-14
Technical Paper
2008-01-0195
John Krumm
This paper describes an algorithm for making short-term route predictions for vehicle drivers. It uses a simple Markov model to make probabilistic predictions by looking at a driver's just-driven path. The model is trained from the driver's long term trip history from GPS data. We envision applications including driver warnings, anticipatory information delivery, and various automatic vehicle behaviors. The algorithm is based on discrete road segments, whose average length is 237.5 meters. In one instantiation, the algorithm can predict the next road segment with 90% accuracy. We explore variations of the algorithm and find one that is both simple and accurate.
2008-04-14
Journal Article
2008-01-0197
Anne Carlsson, Hans-Christian Reuss, Gerd Baumann
In this paper it will be shown how a database containing information of the road characteristics of a frequently driven route can be automatically generated and continually updated in a vehicle during each drive. The contained information can be used as foresight information in predictive driving strategies. By using only drive train information, standard sensors (e.g. from ESC and ABS), and a GPS relevant road characteristics (curves, slopes, speed limits, etc) can be identified during the drive, stored in an on-board database, and used to optimize fuel consumption or driving comfort in subsequent trips along the route. The system is verified using a driving simulator with a 3D surround graphics system.
2008-04-14
Journal Article
2008-01-0199
M. G. Mehrabi
This paper deals with controller design for path tracking control of intelligent vehicle systems. A two degrees of freedom (DOF) model is developed to represent the motion of a vehicle which is used to formulate the path tracking problem of vehicles. By using optimal control theory, the structure of a controller is obtained for vehicles with front and rear steering systems. In designing the controller, a quadratic measure of performance consisting of the integral of the errors (in position and orientation of the vehicle) and the input (front and rear wheel steering angles) are minimized. This controller is implemented to an experimental vehicle and the experimental results of its path following are presented.
2008-04-14
Journal Article
2008-01-0561
Jing Zhou, Huei Peng, Timothy J. Gordon
The characterization of human drivers' performance is of great significance for highway design, driver state monitoring, and the development of automotive active safety systems. Many earlier studies are restricted by experimental scope, the number and diversity of human subjects, and the accuracy and extent of measured variables. In this work, driver lateral control performance on limited-access highways is quantified by utilizing a comprehensive naturalistic driving database, with the emphasis on measures of vehicle lateral position and time to lane crossing (TLC). Normative values at various speed ranges are reported. The results represent a statistical view of baseline on-road naturalistic driving performance, and can be used for quantitative studies such as driver impairment and alertness monitoring, the triggering of lane departure warning systems, and highway design.
2008-03-30
Technical Paper
2008-36-0569
Renata de Brito Rocha, Jules Ghislain Slama, null
The airport noise is the origin of many adverse effects on the human's health and/or his well-being. The most frequent effects, noise annoyance and interference on sleep, have a few noise metrics associated to them. The DNL, LAD and LAN metrics are related to noise annoyance. Also there is, related to DNL metric, the percent of people highly annoyed. Interference on sleep is associated to SEL metric. So, the objective of this research is to develop the use of Geographic Information System (GIS) as a tool to help airport sound impact assessment through the evaluation of noise annoyance and the interference on sleep of the Brasilia's Airport.
2008-03-30
Technical Paper
2008-36-0570
Fernanda Valim, Jules Slama
Aircraft noise is considered to be one of the most difficult environmental problems to be mitigated from the airport operations. The ICAO study group has presented an approach with four proposals to manage this problem at each site – the “Guidance on the Balanced Approach to Aircraft Noise Management” –, but even with this document, the airport managers still have to do their plan of action to address the most problematic ones (cases where there is more than one airport under the same administration). In this way, this paper attempts to propose a methodology to help to identify what would be the equivalent aircraft movement in a month for each site. The hypothesis is that this indicator number will express how close the airport operation is to the Balanced Approach proposals. And to calculate it, this methodology uses the number of movements identified by Chapter 2 or Chapter 3 and by day or night for a given period.
2008-03-30
Technical Paper
2008-36-0585
Nico van Oosten
This paper gives an overview of ways to assess the noise situation at airports and how action plans may be established in order to improve the noise climate. In addition new developments are presented regarding impact assessment and interdependencies with other environmental aspects. Although this paper is focussed on the situation in the European Union, the findings are applicable to airports worldwide.
2008-01-09
Technical Paper
2008-28-0079
Pinaki Mondal, S. Dalela, N. Balasubramanian, G.K. Sharma, Rajesh Singh
Road traffic crashes kill 1.2 million people each year and injure 50 million worldwide. Nearly 8.5% of total fatal accidents per year takes place in India. This issue is creating a huge socio-economic toll globally. Various studies revealed that the total number of people killed in road crashes in regions of the third world countries continued to increase, whereas in the developed nations there has been a steady decrease for the last two decades. This paper aims to critically discuss the road accidents in view of the cause, effect and mitigation means with special emphasis on some technical interventions in the vehicles. Exhaustive review of weather and wet road related crashes have also been carried out as part of the study. Authors commented on the global estimation of the socio-economic impact of road crashes.
2007-11-28
Technical Paper
2007-01-2740
Cleber Willian Gomes, Paulo Eduardo Santos
This article proposes the application of probabilistic Bayesian Net methodology applied on vehicle diagnostic with FMEA
2007-09-24
Technical Paper
2007-01-3350
Mona Weideborg
Discharge of oxygen demanding substances like glycol, formate, acetate or ammonium may give anaerobic conditions, water with unpleasant odour/taste and appearance, as well as bacterial growth. Fish and bottom fauna may be negatively affected. Formate has the lowest oxygen demand, and will therefore be the most environmental friendly runway de-icing agent. Additives in de-icing agents may have a negative effect on the organisms living in the recipients. The only additive of environmental concern in the de-icing products used at Oslo Airport is an alcohol ethoxylate. This substance is ready biodegradable, probably not bioaccumulating, but is very toxic to aquatic organisms. An environmental risk assessment of the discharge water from the Oslo Airport concluded that the discharge would not be acute toxic for algae or crustacean in the water recipient.
2007-09-24
Technical Paper
2007-01-3349
Lars J. Hem, Bjørn Rusten, Jostein Skjefstad
Oslo Airport Gardermoen (OSL) is situated over a ground water reservoir, and collection and handling of spent de-icing fluids is therefore of major importance. OSL have chosen to handle low- and medium strength spent fluids in cooperation with a nearby municipal wastewater treatment plant (WWTP). Medium strength fluid is used as a carbon source for nitrogen removal, and thus used as a resource. Low strength fluid is pre-treated in an aerobic biofilm reactor before it is routed to the plant inlet. Prior to the choice of solution for disposal of the fluids, investigations were performed in laboratory and pilot scale. The efficiency of the fluid as a carbon source for denitrification was studied in parallel with ethanol and methanol as well documented carbon sources. The achieved denitrification rates were comparable with those achieved with methanol, while the necessary addition of carbon source was slightly higher for spent de-icing fluid than for methanol.
2007-09-24
Technical Paper
2007-01-3351
Jarl Øvstedal, Bente Wejden
Oslo Airport Gardermoen is located on the largest unconfined groundwater aquifer in Norway and acts upon strict governmental regulations concerning groundwater balance and contamination of groundwater and surface waters. In the cold Norwegian winter climate, de-icing of aircrafts and runway systems is necessary for safety reasons. The aircraft de-icing fluids (type 1 and type 2) are based on propylene glycol (PG). Potassium Formate (PF) is used for de-icing of runways and taxiways. Aircraft de-icing takes place on remote de-icing platforms. At each platform there is a system for drainage of excess de-icing fluid, but some is passively dispersed from the aircraft body to the area along the runways and mix with snow. During melting, release of de-icers to the ground occurs. In such events the chemicals need to be biologically degraded in the unsaturated zone to meet the governmental requirements.
2007-09-17
Technical Paper
2007-01-3806
Georgios Doulgeris, Sunil Mistry, J. P. Fielding, P. Pilidis
This paper describes the impact of noise on the civil aircraft design process. The challenge to design ‘silent’ aircraft is the development of efficient airframe-engine technologies, for which integration is essential to produce an optimum aircraft, otherwise penalties such as higher fuel consumption, and, or noise are a concern. A description of work completed by Cranfield University will cover design methodologies used for a Broad delta airframe concept, with reference to future studies into alternate concepts. Engine cycle designs for ultra-high bypass ratio, constant volume combustor, and recuperated propulsion cycles are described, with a discussion of integration challenges within the airframe.
2007-09-16
Technical Paper
2007-24-0099
Alessandro Agostini, Maria Lelli, Emanuele Negrenti, Borja Beltran, Stefano Carrese, Antonio Parenti
The new version of TEE model (Transport Energy Environment) has been developed in the frame of the FP5 ISHTAR and HEARTS Projects with several features for better analyzing transport related direct impacts, taking into account vehicles kinematics, cold start emissions distribution and parking processes. Specific efforts were dedicated to the modeling of the effects of vehicles kinematics on hot emissions, where the software calculates link emissions by adopting average speed based functions, instantaneous emissions, or the innovative ‘kinematics correction functions’ model, and the modeling of parking processes which are relevant for cold start and evaporative emissions.
2007-09-16
Technical Paper
2007-24-0073
R.L. Evans
For fuelling road transportation in the future, particularly light-duty vehicles, there has been much speculation about the use of hydrogen and fuel cells to provide electrical power to an all-electric drive train. An alternative powertrain would use a simple battery to store electricity directly, using power from the electrical grid to charge the battery when the vehicle is not in use. The energy efficiency of these two different approaches has been compared, using a complete “energy conversion chain analysis”. The successful development and introduction into the marketplace of grid-connected hybrid vehicles could eliminate the need for road vehicles to use petroleum fuels, at least for the majority of miles traveled. If electricity were to be generated primarily from sustainable primary energy sources, then road transportation would also become sustainable, resulting in an “Electricity Economy”, rather than a “Hydrogen Economy.
2007-08-05
Technical Paper
2007-01-3574
Tianjun Zhu, Changfu Zong, Hongyu Zheng, Chengwei Tian, Hongyan Zheng
This paper sets up a simplified dynamic model for simulating the yaw/roll stability of heavy tractor-semitrailer using Matlab/Simulink. A linear quadratic regulator (LQR) based on partial-state feedback controller is used to optimize the roll stability of the vehicle. The control objective for optimizing roll stability is to be reducing the lateral load transfer rate while keeping the suspension angle less than the maximum allowable angle. The simulation result shows that the LQR controller is effective in the active roll stability control of the heavy tractor-semitrailer.
2007-08-05
Technical Paper
2007-01-3579
Dongho Shin, Sungbo Sim, Jaehoon Ryu, Jaekwan Lee, Insik Lee
This paper mainly focuses on a lateral control law for pre-given path following which is developed by using the backstepping control design methodology. The position information of the vehicle is obtained by Real Time Kinematic DGPS, and the yaw rate and side-slip angle used in controller are estimated by Kalman estimator. To show the performance of the proposed controller under different speed and various path curvature conditions, the results are given through experiments which are executed on proving ground especially designed for high maneuvering test of which minimum radius of curvature is about 60 m.
2007-08-05
Technical Paper
2007-01-3578
Kwangho Yoo, Ahra Lee, Taedong Ahn, Deog-kyoon Jeong, Dong-il “Dan” Cho
This paper describes our development work for acceleration sensing modules for electronic stability program (ESP) applications. The accelerometer is fabricated using the unique sacrificial/bulk micromachining (SBM) process by us. The sensing modules are designed to measure low level accelerations accurately and be stable in an automotive environment. This paper describes the accelerometer design and fabrication, electronic circuits and PCB design, module assembly, and performances of the developed sensing module. The developed sensing module offers analog voltage output with ±1.5g dynamic range, 0.05% nonlinearity, >50Hz bandwidth and 1295mV/g scale factor. The module includes a CAN2.0A interface and yields good experimental performance when implemented on a CAN test server.
2007-08-05
Technical Paper
2007-01-3570
Tang Xinpeng, Duan Xiaocheng
A virtual sport utility vehicle (SUV) model is built by using ADAMS/Car. The model is simplied with 95 DOFs equipped with active anti-roll bars in front and rear suspension. A fuzzy tunning PID controller using roll angle input source is applied in the active roll control. It is co-simulated under the Matlab/Simulink software environment and realizes the online coordination. The simulation results show that this controller has the ability of self-adjusting and decreases the body roll angle effectively. The vehicle riding comfort is ensured and the vehicle directional stability is improved.
2007-08-05
Technical Paper
2007-01-3568
N. White, P. E. Brandon
This paper explores the relationship between the damper and its mounting and outlines objective techniques that would aid product development and benchmarking accuracy. One of the outcomes is an improved damper test waveform and better post processing techniques that provide a variety of metrics.
2007-08-05
Technical Paper
2007-01-3573
Mai Li, Zong Changfu, Pan Zhao, Jiang Xiangping
With the development of the auto industry, the automobile manufacturers demand to shorten development period and reduce the cost. Compared with the traditional method, applying the virtual prototype is more economical. This paper presents a method for parameters sensitivity analysis and optimizing the performance of vehicle handling. The considered design parameters include suspension design parameters (the compliance parameters such as the stiffness of the spring, the kinematic parameters such as the coordinates of hard points in front, rear suspensions etc.), steering system design parameters (the inertia of steering wheel, the ratio of steering gear etc.), and operating parameters (the inertia and the coordinates of the center of the sprung mass, etc.). Finally the handling performances of the new designed vehicle are simulated by using the full vehicle ADAMS model.
2007-08-05
Technical Paper
2007-01-3572
Cao Youqiang, Luo Hong, Deng Zhaoxiang, Lai Fei
The influences among the weight number of object function, maximum value of suspension optimum control force and suspension performance are analyzed in this paper. A total state feedback controller for the 7-degree-freedoms modal of total vehicle based on random optimum control strategy is built. By ADAMS &MATLAB \simulink co-simulation, the influence of weight number of object function on maximum value of suspension control force and suspension performance is discussed in the paper. It obtains the relations among maximum value of suspension optimum control force, suspension performance and the variety of weight number Then a set of weight number which are applied to the object function of optimum control for the car are selected at last.
2007-08-05
Technical Paper
2007-01-3562
Balamurugan Janarthanam, Samir K. Ghodekar, Amol A. Apte
Abstract It is customary to select a twist beam rear suspension for front wheel driven small and medium range passenger cars. Besides better primary / secondary ride comfort, roll stiffness tuning ability, ease of assembly & good packaging solutions than the conventional semi trailing arm/ rigid axle suspensions, twist beam suspension system accentuate the concentration required in placing & orienting the cross beam to achieve certain imperative kinematical characteristics. In order to make the solutions of the required kinematical targets viable, it is vital to have the packaging space and stress concentration within yield limits given the weight & cost targets. This paper presents the work done on twist beam type suspension for a new generation entry level B-Class hatchback vehicle developed. To reduce the time consumed in validation of different design proposals a virtual validation process was developed.
Viewing 181 to 210 of 1645