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Viewing 1 to 30 of 19387
2017-01-24
Event
2016-10-26
Event
This session will cover conceptual, modeling and experimental studies relating to advanced turbochargers/superchargers and advanced boosting systems to achieve increased power density, better fuel economy, and reduced emissions.
2016-10-25
Event
The session covers advances in the development and application of models and tools involved in multi-dimensional engine modeling: advances in chemical kinetics, combustion and spray modeling, turbulence, heat transfer, mesh generation, and approaches targeting improved computational efficiency. Papers employing multi-dimensional modeling to gain a deeper understanding of processes related to turbulent transport, transient phenomena, and chemically reacting, two-phase flows are also encouraged.
2016-10-25
Event
Separate sub-sessions cover zero-dimensional, one-dimensional, and quasi-dimensional models for simulation of SI and CI engines with respect to: engine breathing, boosting, and acoustics; SI combustion and emissions; CI combustion and emissions; fundamentals of engine thermodynamics; numerical modeling of gas dynamics; thermal management; mechanical and lubrication systems; system level models for controls; system level models for vehicle fuel economy and emissions predictions.
2016-10-25
Event
Papers cover exhaust aftertreatment system models, as well as their validation and application. Technologies encompassed include DOC, HC Trap, DPF, GPF, LNT, TWC, SCR, SCRF, ammonia oxidation catalysts, hybrid or combined catalysts, urea-water solution spray dynamics, and mixture non-uniformity. Modeling aspects range from fundamental, 3D models of individual components to system level simulation, optimization, variation, degradation, and control.
2016-10-24
Event
This session considers modeling (zero-D, 1D, 2D, 3D CFD) and experimental papers on: combustion chamber, systems (lubrication, cooling, fuel, EGR); components (oil pumps, coolant pump, fuel injectors, compressors, turbines, turbochargers, torque converters, gear box, fans, bearings, valves, ports, manifolds, turbine housing); heat exchangers (radiators, oil coolers); aftertreatment (SCR, DOC, DOF, exhaust gas cooling); battery cooling (HEV, EV, motor/generator) and controls (passive and active).
2016-10-24
Event
The focus of this session is the measurement and analysis of in-cylinder and port flows in research and production engines. Topics may including PIV, PTV, LDV, and fluorescent tracer measurements of velocity and turbulence characteristics and modeling analysis of engine flows.
2016-10-24
Event
This session is devoted to experimental and computational work in the area of fuel injection systems and sprays. Topics include: spray characterization, cavitation, multi-phase jet modeling, CFD models for spray processes, wall films and impingement, hydraulic circuit analysis, and dissolved gas effects. Studies of both gasoline and diesel fuel sprays and fuel injection equipment are encouraged.
2016-10-01
Book
Lev Klyatis
The ability to successfully predict industrial product performance during service life provides benefits for producers and users. This book addresses methods to improve product quality, reliability, and durability during the product life cycle, along with methods to avoid costs that can negatively impact profitability plans. The methods presented can be applied to reducing risk in the research and design processes and integration with manufacturing methods to successfully predict product performance. This approach incorporates components that are based on simulations in the laboratory. The results are combined with in-field testing to determine degradation parameters. These approaches result in improvements to product quality, performance, safety, profitability, and customer satisfaction.
2016-09-27
Technical Paper
2016-01-2090
Sergey Lupuleac, Margarita Petukhova, Julia Shinder, Alexander Smirnov, Mariia Stefanova, Nadezhda Zaitseva, Tatiana Pogarskaia, Elodie Bonhomme
Perspective way of solving the problem of aircraft assembly optimization is global simulation of junction process using efficient numerical algorithms. Specialized software complex [1] was developed within the framework of cooperation between Airbus SAS and Saint Petersburg Polytechnic University. This tool allows engineers to simulate the aircraft assembly process and solve the number of tasks: • Calculation of resulting gap under given initial disposition of riveted parts and distribution of fastening elements; • Determination of fastening element pattern that provides sufficient quality of assembly; • Shimming prediction; • Evaluation of stresses caused by assembly. The tool is based on special approach that necessitates solving contact problem arising when aircraft parts are being joined. This problem can be described by several simplifying assumptions such as ommiting tangential displacements and friction from consideration and creating substructure for junction area.
2016-09-27
Technical Paper
2016-01-2124
Sara Nilsson, Jonas Jensen, Mats Björkman, Erik Sundin
For the aerospace industry carbon fiber reinforced plastics (CFRP) is one of the fastest developing materials right now. The material has a strength-to-weight ratio that is several times higher than aluminium and steel, which makes it a great fit for applications where a low weight is crucial while maintaining strength and stiffness. It is specifically CFRP in pre-impregnated form, so called pre-preg, which has made its way into the aircrafts. Pre-preg is an anisotropic material that lets the designer control its properties to a high level of detail. Analogously to the material becoming used more widely in the aerospace industry the costs have decreased as the manufacturing methods have developed to follow the demands. However, how material and manufacturing method change the requirements and affect a product's design and performance can be hard to determine.
2016-09-27
Technical Paper
2016-01-2123
Matthias Busch
The integration of omega stringers to panels made of carbon fiber reinforced plastic (CFRP) by adhesive bonding, which are joined together in an autoclave, must be subject to high quality standards. Defects such as porosity, kissing bonds, voids or inclusion must be detected safely to guaranty the functionality of the component. Therefore, an inspection system is required to verify these bonds and detect different kinds of defects. In this contribution, the advantages of a robotic inspection system, which will be achieved through continuous testing, will be introduced. The testing method is the active thermography. The active thermography has major advantages compared with other non-destructive testing methods. Compared to testing with ultrasonic there is no coupling medium necessary, thus testing will be significantly enhanced.
2016-09-27
Technical Paper
2016-01-8148
Louis Carbonne, Niklas Winkler, Gunilla Efraimsson
The prediction in the design phase of the stability of ground vehicles subject to transient crosswinds become of increased concern with drag reduced shapes, platooning as well as lighter vehicles. The objective of this work is to assess the order of model complexity needed in numerical simulations to capture the behavior of a ground vehicle going through a transient crosswind. The performance of a full-dynamic coupling between aerodynamic and vehicle dynamic simulations, including a driver model, is evaluated. In the simulations a feedback from the vehicle dynamics into the aerodynamic simulation are performed in every time step. In the work, both the vehicle dynamics response and the aerodynamics forces and moments are studied. The results are compared to a static coupling approach on a set of different vehicle geometries.. One simplified bus geometry and five car-type geometries are evaluated.
2016-09-27
Technical Paper
2016-01-8044
Guoyu FENG, Wenku Shi, Henghai Zhang, Qinghua Zu
In order to predict the fatigue life of heavy commercial vehicles thrust rod made of rubber material dumbbell specimens and uniaxial tensile fatigue tests. Based on the measured data samples to the maximum principal strain injury parameters established rubber uniaxial fatigue life prediction models. In the longitudinal tension and compression loading, fatigue life V rods were predicted, and by the uniaxial fatigue test verification, the results show that the maximum principal strain prediction model, the maximum error is less than 10% predicted better results. Show by dumbbell specimen data, the establishment of a spherical hinge rubber life prediction model method, it is possible to predict the fatigue life of the thrust rod.
2016-09-27
Technical Paper
2016-01-8027
Stefan Steidel, Thomas Halfmann, Manfred Baecker, Axel Gallrein
Rolling resistance and tread wear of tires do particularly influence the maintenance costs of commercial vehicles. Although the tire labeling is established in Europe, it is meanwhile well-known that, due to the respective test procedures, these labels do not hold in realistic application scenarios in the field. This circumstance arises from the development phase of tires, where the respective performance properties are mainly evaluated in tire/wheel standalone scenarios in which the wide range of usage variability of commercial vehicles cannot be considered adequately. Within this article we address a method to predict indicators for rolling resistance and tread wear of tires in realistic application scenarios considering application-based factors of influence like specific customers, operation circumstances, regional dependencies, fleet specific characteristics etc. Moreover, the prescribed methodology may also be transferred to the prediction of fuel consumption and emission.
2016-09-27
Technical Paper
2016-01-8113
Xiaohua Zeng, Guanghan Li, Dafeng Song, Sheng Li, Xianghua Li
This paper introduces the configuration and operation principle of the hydraulic hub-motor auxiliary system for heavy truck, which could achieve auxiliary driving and auxiliary braking function. In order to achieve coordinate distribution of the engine power between mechanical and hydraulic system, the hydraulic pump displacement controller is designed. A layered auxiliary drive control strategy is proposed to improve vehicle performance. Finally, the simulation model is built in the MATLAB/Simulink and AMESim platform and the co-simulation is conducted to verify the proposed control strategy. The results show that the strategy could realize effective control and the traction force increased proportion can be up to 15.6~17%, which would significantly improve the drivability and passing capacity of heavy truck.
2016-09-27
Technical Paper
2016-01-8147
Justin J. Novacek, Bhargav Sowmianarayanan
Trailer positioning plays a significant role in the overall aerodynamics of a tractor-trailer combination and varies widely depending on configuration and intended use. In order to minimize aerodynamic drag over a range of trailer positions, adjustable aerodynamic devices like a trim tab may be utilized. For maximum benefit, it is necessary to determine the optimal position of the aerodynamic device for each trailer position. This may be achieved by characterizing a two-dimensional design space consisting of trailer height and tractor-trailer gap length, with aerodynamic drag as the response. CFD simulations carried out using a Lattice-Boltzmann based method were coupled with modeFRONTIER for the creation of multiple Kriging Response Surfaces. These response surfaces were employed to generate an optimal positioning map for the given aerodynamic device. This methodology was further refined by obtaining performance maps for multiple tractor configurations.
2016-09-27
Technical Paper
2016-01-8028
Chao Yang, Nan Xu, Konghui Guo
This paper focuses on the modeling process of incorporating inflation pressure into the UniTire tire model for pure cornering. Via observing and manipulating the tire experimental data, the effects of inflation pressure on the tire cornering property are analyzed in detail, including the impacts on cornering stiffness, the peak friction coefficient, the curvature of transition region and the pneumatic trail. And the brief mechanism explanations are also given for some of those impacts. The results show that some effects of inflation pressure are similar to that of vertical load on the non-dimensional tire cornering property, and also have strong interactive effects between the two operating conditions. Therefore, in order to obtain concise expressions, the inflation pressure is incorporated into the UniTire tire model by analogy with the expressions for vertical load, and the interactive effects are also taken into account.
2016-09-27
Technical Paper
2016-01-8055
Rohit Saha, Long-Kung Hwang, Mahesh Madurai Kumar, Yunfeng Zhao PhD, Chen Yu, Bob Ransijn
Wheel-loaders’ sub-systems like engine, driveline, hydraulics, cooling and mechanism are becoming increasingly more integrated and complex. This is mostly caused increased demand of energy efficiency, electronic controls and performance requirements from competitors and customers. In order to understand the complex sub-system interactions it requires engineers to use a common simulation platform which captures the multi-domain nature of a wheel-loader. Engineers from different sub-system groups can use such model to validate the full system requirements. Wheel-loader sub-system are multi-domain (controls, mechanism, hydraulics, thermal etc.) in nature. This paper describes the process of the development of a Multi-domain simulation of a wheel-loader. Working hydraulics, kinematics of working tool, driveline, engine and cooling system are modelled in LMS Amesim. Contacts between boom/bucket and bucket/ground are defined to constrain the movement of the bucket and boom.
2016-09-27
Technical Paper
2016-01-8122
Jiaqi Xu, Hwan-Sik Yoon, Jae Y. Lee, Seonggon Kim
A neural network-based computer vision system is developed to estimate position of an excavator manipulator in real time. A camera is used to capture images of a manipulator, and the images are used to train a neural network. Then, the trained neural network can estimate the position of the excavator manipulator in real-time. To study the feasibility of the proposed system, an excavator simulator with a webcam is used. The simulation results show that the developed neural network-based computer vision system can estimate the position of the excavator manipulator with an acceptable accuracy.
2016-09-27
Technical Paper
2016-01-8013
Marius Feilhauer, Juergen Haering PhD, Sean Wyatt
The way to autonomous driving is closely connected to the possibility of verifying and validating Advanced Driver Assistance Systems (ADAS), as it is one of the main challenges to achieve secure, reliable and therewith socially accepted self-driving cars. Hardware-in-the-Loop (HiL) based testing methods offer the great advantage of validating components and systems in an early stage of the development cycle and it is an established process in automotive industry. When validating ADAS using HiL test benches, there are different barriers and conceptual difficulties engineers have to face: How to pipe simulated signals into multiple sensors including Radar, Ultrasonic, Video or Lidar? How to combine classical physical simulations, e.g. vehicle dynamics, with sophisticated three-dimensional, GPU-based environmental simulations? In this article, we present current approaches of how to master these challenges and provide guidance by showing the advantages and drawbacks of each approach.
Viewing 1 to 30 of 19387

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