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Viewing 1 to 30 of 5197
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.
2016-09-27
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
2016-01-8113
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
2016-01-8122
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.
2016-09-20
Technical Paper
2016-01-2026
Dhwanil Shukla, Nandeesh Hiremath, Narayanan Komerath
Rigid or semi-rigid airships are gaining appeal for several applications requiring steady cargo transport, long endurance, low downwash and noise over populated areas, and rescue missions. Modern rigid-hulled airships use auxiliary lift and propulsion for the load-carrying segments of their operations. Tilting ducted fans and quad-rotors have been typically considered for the purpose. We are developing a concept where cycloidal rotors are used. These can operate both as lifting devices and as propulsive devices. The size of an airship allows the cylcoidal rotor to have a much larger diameter than on a helicopter, so that the rotation speed is low, and while minimizing downwash and noise. These features make the cycloidal rotor/airship combination ideas for the hypercommuting-on-demand application over congested urban and suburban areas. In this paper, the literature on hypercommuting, airships and cycloidal rotors will be surveyed.
2016-09-20
Technical Paper
2016-01-1987
Mingming Yin, Serhiy Bozhko, Seang Shen Yeoh
The paper will deal with the control design for an electric generation system which for future aircrafts. The future on-board systems are expected to be more efficient, safer, simpler in servicing and easier in maintenance. As a result, many existing hydraulic and pneumatic power driven systems are being replaced by their electrical counterparts. This trend is known as a move towards the More-Electric Aircraft (MEA). As a result, a large number of new electrical loads have been introduced in order to power many primary functions including actuation, de-icing and anti-icing, cabin air-conditioning, and engine start. Therefore electric power generation systems have a key role in supporting this technological trend. The state-of-the-art generation technology typically employs a three-stage wound-field synchronous machine. Advances in modern power electronics now allow the developers to consider including other machine types within the S/G.
2016-09-20
Technical Paper
2016-01-1991
Syed J. Khalid
Engine bleed and power extraction are required by the aircraft to operate the various onboard subsystems which are necessary for the proper functioning of the aircraft. These extractions are parasitic for engine performance and operation. The engine companies make large investments in technology to achieve a couple of percent in engine efficiency. These gains can be quickly negated if bleed and power extraction are not judiciously managed for minimizing the amounts of extractions. Permission has been obtained from Boeing to use their public domain information on subsystem architecture to articulate the message in this paper. Help from Boeing and from Specific Range Solutions Ltd of Canada in the preparation of this paper is acknowledged. The paper will first quantify the detrimental effects of bleed and power extraction on engine performance and operation using the proven GasTurb 12 performance software. The engine modelled is similar to a modern transport aircraft turbofan.
2016-09-20
Technical Paper
2016-01-2051
Andreas Himmler, Lars Stockmann, Dominik Holler
The application of a communication infrastructure for hybrid test systems is currently a topic in the aerospace and automotive industries. The demand for such a communication infrastructure is driven by the users’ need to run tests on hybrid test systems. These consist of individual, coupled test systems, each dedicated to different, even diverse needs. In the aerospace industry, there is a growing demand for modularity. Future laboratory tests means (LTM) must be scalable and exchangeable for maximum flexibility. Due to their very nature, hybrid test systems are used as integration test systems for large portions of the electronics of an aircraft (e.g., avionics, cabin) or even the complete aircraft electronics. Thus, these integration test systems need to handle high numbers of I/O channels and bus data. In order to make such test systems manageable and to enable a flexible use (e.g., to use only parts of such a system for dedicated tasks), using modular test systems makes sense.
2016-09-20
Technical Paper
2016-01-1976
Kiran Thupakula, Adishesha Sivaramasastry
Aviation safety is one of the key focus areas of the aerospace industry as it involves safety of passengers, crew, assets etc. Due to advancements in technology, aviation safety has reached to safest levels compared to last few decades. In spite of declining trends in in-air accident rate, ground accidents are increasing due to ever increasing air traffic and human factors in the airport. Majority of the accidents occur during initial and final phases of the flight. Rapid increase in air traffic would pose challenge in ensuring safety and best utilization of Airports, Airspace and assets. In current scenario multiple systems like Runway Debris Monitoring System, Runway Incursion Detection System, Aircraft Strike Alert System in taxiways, Obstacle avoidance system, Traffic Collision Avoidance System are used for collision prediction and alerting in airport environment.
2016-06-16
Standard
EQB1
Scope is unavailable.
2016-06-15
Technical Paper
2016-01-1779
Sergio Carvajal, Daniel Wallner, Reinhard Helfrich, Michael Klein
Abstract Numerical methods for brake squeal analysis are widely accepted in industry. The use of complex eigenvalue analysis is a successful approach to predict the appearance of squeal noise. Using simulation in an early design stage reduces time to market, saves costs, and improves the physical behavior and robustness of the brake system. State of the art of brake simulation comprises sampling for many parameter sets in a wide range of interesting values. Based on high performance, stability maps can be created in short time containing many results, which gives a deep insight into the brake behavior under varying parameters. An additional benefit of sampling is the possibility to detect parts with high potential for improving the NHV comfort. In the sequel, mathematical optimization methods like topology optimization or shape optimization are used for systematic improvements.
2016-06-15
Technical Paper
2016-01-1857
Ettore Lappano, Frank Naets, Martijn Vermaut, Wim Desmet, Domenico Mundo
Abstract This paper proposes a specific parametric model order reduction (pMOR) scheme for the efficient evaluation of beam based structures. The model to be parameterized is a Finite Element (FE) model that represents a generic network of beams with a number of distinct cross-section types. The methodology considers geometrical parameters that describe the cross-section and the material properties of the beams as the design parameters of interest. An affine representation of the model is derived based on the description of the deformation of a uniform beam. This affine representation can be exploited for the hyper-reduction where the evaluation cost of the system matrices is reduced. The reduction of the system matrices is obtained through a projection based approach. For a given number of parameter combinations a modal basis is constructed. A global reduced order basis (ROB) is obtained through a principal component analysis of these local bases.
2016-06-15
Technical Paper
2016-01-1856
Hannes Allmaier, Günter Offner
Abstract Elastohydrodynamic (EHD)-simulation is a widely applied simulation technique that is used in a very diverse field of applications ranging from the study of vibroacoustics to the calculation of friction power losses in lubricated contacts. In particular, but not limited to, the automotive industry, technical advances and new requirements put current EHD simulation methodology under test. Ongoing trends like downsizing, downspeeding, start-stop and the continuing demand for increasing fuel efficiency impose new demands and challenges also on the simulation methodology. Increasing computational capabilities enable new simulation opportunities on the other hand. In the following, an overview is given on the current state of the art and today’s challenges for the elastohydrodynamic simulation of journal bearings and their wide range of applications from highly loaded main bearings supporting the crank shaft in the ICE to high speed turbocharger bearings.
2016-06-01
Magazine
Digital Design Tools Simulating Thermal Expansion in Composites with Expanded Metal Foil for Lightning Protection Rugged Computing Designing VME Power Systems with Standard Modules Optical Sensors Optical Ice Sensors for UAVs Rotorcraft Technology Rotorcraft Icing Computational Tool Development RF & Microwave Technology Curled RF MEMS Switches for On-Chip Design: Design Software Supports BAE System's Mixed-Signal Chip Design
2016-05-17
Magazine
Base-engine value engineering for higher fuel efficiency and enhanced performance Continuous improvement in existing engines can be efficiently achieved with a value engineering approach. The integration of product development with value engineering ensures the achievement of specified targets in a systematic manner and within a defined timeframe. Integrated system engineering for valvetrain design and development of a high-speed diesel engine The lead time for engine development has reduced significantly with the advent of advanced simulation techniques. Cars poised to become 'a thing' Making automobiles part of the Internet of Things brings both risks and rewards. Agility training for cars Chassis component suppliers refine vehicle dynamics at the high end and entry level with four-wheel steering and adaptive damping.
2016-04-14
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.
2016-04-14
Event
This session focuses on modeling the performance of complex engine and vehicle systems through consideration of mechanical, fluid, and thermal effects.
2016-04-14
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.
2016-04-14
Event
The Thermal Systems Modeling and Simulation session focusses on state of the art simulation technologies for modeling thermal systems and their application in the development and optimization of vehicle thermal management and fuel economy. The papers in the session will range from empirical, 1D modeling methods to three dimensional CFD models as well as coupled methods.
2016-04-14
Event
The Thermal Systems Modeling and Simulation session focusses on state of the art simulation technologies for modeling thermal systems and their application in the development and optimization of vehicle thermal management and fuel economy. The papers in the session will range from empirical, 1D modeling methods to three dimensional CFD models as well as coupled methods.
2016-04-14
Event
The complexity and cost of military vehicle ground vehicles are ideal candidates for the system-level modeling and simulation environment. This session will address the emerging technologies, practical challenges, and current gaps related to modeling and simulation of military ground vehicles. Topics of interest may consist of vehicle system integration and optimization, vehicle dynamics/control , advanced and hybrid powertrains, high performance structures/materials and vehicle mobility
2016-04-14
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.
Viewing 1 to 30 of 5197

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