Refine Your Search

Topic

Author

Affiliation

Search Results

White Paper

Innovative Assembly Systems for the Aerospace Industry

2017-10-31
WP-0004
The aerospace industry is facing new challenges to meet burgeoning customer demand. An unprecedented number of orders for commercial aircraft is forcing aerospace manufacturing to make gains in efficiency throughout aircraft production and operation. However, current manufacturing systems are using technologies and production methods unsuited to a future dynamic market. To ensure its profitability, the aerospace industry must seize the opportunity to innovate and readdress approaches to manufacturing. This whitepaper looks at four advanced manufacturing (AM) solutions designed to improve assembly process efficiency, automation, and accuracy.
White Paper

Studies into Additive Manufacturing for In-Space Manufacturing

2017-06-26
WP-0001
NASA has embarked on an ambitious program to integrate additive manufacturing techniques and to develop processes for the microgravity environment. The most recent example of this program is the successful launch and deployment of the first 3D printer on the International Space Station. In this one-year effort, students were required to meet a series of milestones to design, manufacture, and test their ideas in close cooperation with members of the NASA Exploration Augmentation Module (EAM) concept team.The participants in this project were tasked with thinking of new solutions using AM that would simultaneously be recyclable with minimal loss in mechanical properties but also have the capacity for high mechanical properties. Working in interdisciplinary teams, the participant teams investigated the use of recycled materials, characterization, testing, modeling, and tool development.
White Paper

The Use of Imaging for Powder Metal Characterization and Contamination Identification

2018-04-05
WP-0008
As AM technologies are being used with higher frequencywithin the automotive and aerospace industries, the interest in powder characterization and contaminant identification is growing—especially for suppliers looking to gain entry into these highly regulated industries. Standards for powder materials and methods used for aerospace applications are still be developed, and regulatory agencies such as the Federal Aviation Administration have been requesting that standards be developed as guidance for the industry. Methods such as CCSEM and HLS could be viable options for suppliers needing to adhere to a powder specification by demonstrating compliance. Solutions exist to integrate such methods into a production environment as exemplified by RJ Lee Group.
Solution Notes

Drilling Material Stacks: Can it be both automated and affordable?

2017-06-26
SN-0001
Automating a manufacturing process often comes with substantial investment or sustained operational costs of complex subsystems. But, by reducing complexity and using technologically mature components, it is possible to develop viable scaled and robust automated solutions. For the past several years, aerospace manufacturers have endeavored to automate manufacturing processes as much as possible for both production efficiencies and competitive advantage. Automating processes like drilling, fastening, sealing, painting, and composite material production have reaped a wide range of benefits; from improving quality and productivity to lowering worker ergonomic risks. The results have improved supply chains from small component manufacturers all the way up to airframe assemblers. That said, automation can be very expensive, and difficult to introduce when a product is anywhere beyond the beginning of its life cycle.
Tech Insights

Repairing Composites

2017-08-09
TI-0001
As the aerospace industry continues on its quest for ever-increased efficiency, so goes the quest for ever-more composite content on aircraft. And with it, more opportunities to repair it. Typical composite panel fiber reinforcements are carbon, aramid, and fiberglass. The machining techniques for these typical composite materials are similar, but minor differences exist, such as the style of cutting tool or drill bit. Automated drilling methods that may be used during original manufacture are rarely used in typical composite repair situations.
Technical Paper

Vertical vehicle dynamics on soft ground~Investigations with FEM

2000-06-12
2000-05-0393
The Finite Element Method (FEM) has proved to be a suitable tool for the investigation of wheel-soil interaction. Compared to analytical models, the FEM presents numerous advantages. The sinkage and the deflection of the wheel, the pressure distribution in ground, the motion of the soil and especially the contact shape between the elastic wheel and the deformed soil are gained as simulation results. Moreover, the soil compaction in the depth can be visualized. Using the FEM, effects have been investigated so far with the interaction between a single wheel and soft soil. Because of the change of the ground contour due to the dynamical wheel-loads, depending on the vehicle oscillation, the influence from the pitching and vertical oscillating vehicle has to be considered. Therefore the well-known FEM-based simulation concept VENUS is extended to VENUS-DYN (DYNamic VEhicle NatUre Simulation), that includes a two-dimensional model of a complete vehicle interacting with soft ground.
Technical Paper

Mobility and fuel economy of hybrid-driven vehicles in terrain~Results from computer simulation

2000-06-12
2000-05-0394
An important requirement for the application of hybrid drives in future terrain vehicles is their competitiveness with regard to the driving properties and the fuel economy. Therefore, a two-axle, all-wheel-driven military transport vehicle equipped with a serial hybrid propulsion system has been regarded and examined by computer simulation. The tool, used for this purpose, is the simulation program ORSIS, (Off Road Systems Interactive Simulation), which has been developed at the University of the Federal Armed Forces in Hamburg. By generating a realistic surrounding area with reproducible conditions ORSIS allows an objective comparison of different vehicle types and the investigation of the influence of modified vehicle parameters. The paper presents results from computer simulations which include acceleration and braking procedures, determination of maximum drawbar pull, and the estimation of fuel consumption under realistic conditions by driving on determined routes.
Technical Paper

Speed adaptation system for vehicles using RF communication

2000-06-12
2000-05-0380
This paper introduces a speed adaptation system using roadside-to-vehicle RF communication. The RF transmitter transmits transmitter''s ID, speed limit, message to the drivers. The messages include occurrence of accident, freezing road, existence of gas station, or construction on the road, etc. At present, drivers identify the speed limit from speed sign board. But drivers cannot concentrate his attention continuously on finding speed sign board, so over speed takes place unintentionally. And one of current information medium to the drivers is variable message sign board (VMS) showing the present road status such as severe congestion, occurrence of accident, or heavy rain. But due to high installation cost of VMS, insufficient number of VMS units are installed on the road. So timely notification of traffic accident to the following drivers is impossible now. Our system is low cost to be installed at close intervals on the highway.
Technical Paper

Development of mayday system

2000-06-12
2000-05-0381
In the event of an emergency situation or a roadside trouble, drivers need rapid help. But, in many cases, it takes too much time to get help, and it even results in a more fatal situation. Rapid response to run-off-the-road and other accidents can help reduce the number of resulting deaths. In many countries, mayday service was developed and commercialized to provide a call and dispatching service in an emergency situation. Daewoo Motor is developing a DreamNet™ system which uses technologies for real-time emergency call and dispatching. The DreamNet™ system is composed mainly of in-vehicle unit, communications system and DreamNet™ service center. The system can be operated by user''s request and also be activated by an external event such as accident, emergency and theft of the vehicle. It transmits the location and type of distress information of the vehicle to the DreamNet™ service center.
Technical Paper

A Modeling of the Heart Rate Variability to Estimate Mental Work Load of Driver

2000-06-12
2000-05-0375
When we evaluate the human-machine-environment systems, it is very important to consider not only the performance of the machine system but also the Mental Work Load (MWL) for the operator. Because human being have a high adaptability to their surroundings. Therefore, we constructed the dynamic model of the human-machine-environment system using the Heart Rate Variability.
Technical Paper

Structuring Neural Network Driver Model and Analyzing Its Characteristics

2000-06-12
2000-05-0376
Using the results of lane-change tests performed on a driving simulator, driver models were developed by means of a neural-network system. Several kinds of driver visual information were used as input data for structure of the neural network, and the steering angle was employed as learning information. A series of simulations employing the trained neural network was conducted to determine the allowable ranges of initial vehicle position, velocity, stability factor, and other variables for successful lane-change maneuvers and for stable running against side winds.
Technical Paper

Driver → vehicle behavior → intelligent vehicle

2000-06-12
2000-05-0377
In this article, the authors try to get their own contribution for solving any actual problems in vehicle stability and handling framework. It used submodeling techniques for entire dynamic mechanical system. Fuzzy modeling is used for one realistic description of dynamic mechanical system represented by vehicle. It applied one solving algorithm of fuzzy relational equations, having genetics algorithm support technique. Finally, it construct one neural network will be fast learning from relations equations solutions. The online work is required approximate equal with driver behavior.
Technical Paper

Development of a Semi-Active Suspension for a 6×6 Combat Support Vehicle.

2000-06-12
2000-05-0390
In this paper, the development of a full vehicle semi-active suspension controller for a 6×6 CSV (combat support vehicle) is described. The controller uses linear optimal control theory to generate the control gains with the overall aim of reducing ride acceleration and hence maximising cross country speed. A vehicle model is developed to predict ride comfort improvements and, in particular, determine the effect that a roll acceleration weighting factor has on the overall vehicle performance. Subsequently, limited state feedback strategies are evaluated to determine the most effective method of implementation on a real vehicle.
Technical Paper

The role of government in the change from national to supranational legislation

2000-06-12
2000-05-0384
As a result of the modification of the 58th Geneva Agreement in 1995, which invited non-European countries to join the Agreement, a process of harmonization of the compulsory-compliance standards in the automobile sector is taking place, to the detriment of the particular laws of each country. The number of countries involved in this process grows year by year. At the moment, governments must make new legislation reconcile the interest of their countries, derived from their particular problems, with the interest of all the other countries involved. This process entails long negotiations, due to the existence of sometimes conflicting interest, defended by the different governments and manufacturers and consumers organizations.
Technical Paper

Expressway speed limits: Germany is right, ECMT is tragically wrong

2000-06-12
2000-05-0362
Three years of research, and two papers, showing a strong correspondence between traffic fatality rates and the business cycle, have proven that, alcohol aside, the fundamental cause of traffic accidents is the mentally distracted driver. This paper is in four parts. A quick review of the discovery/development of the Driver''s Economic Distraction Indicator (DEDI - SAE 970280 on European expressways in the ''70s) and its application to all traffic fatalities in countries around the world (in F98S565). The DEDI is then updated to the ''90s while exploring: a) the use of M2 (as recommended by the American economist, Dr. Milton Friedman) instead of M1; b) OECD''S new Composite Leading Indicators; and c) the use of a locally available leading economic indicator (i.e., new vehicle sales) to give an early warning of a rise in local traffic accidents.
Technical Paper

A forward collision warning an avoidance algorithm

2000-06-12
2000-05-0366
The number of automobiles is rapidly increasing, as are the importance of the car as a way of transportation, and the variety of its uses. In these environments, a safety, one of the primary factors, which must be considered in automotive engineering, demands a system that aids the driver''s perception, in addition to the existing passive method, which relies on just man''s ability. In this point of view, development of the promoted system that complements the passive safety devices is demanded. A system like this should make driving safe and satisfy the need for comfort, while decreasing the driver''s burden and fatigue. The object of this paper is the development of an algorithm that warns the collision ahead and avoids this situation, using some information about the host-car, target-car, surroundings, road conditions, etc. The warning system is developed using a decision algorithm of the degree of safety. To show the validity system based on our safety algorithm.
Technical Paper

The development of in-vehicle unit of advanced vehicle information and communication system

2000-06-12
2000-05-0370
This paper presents an in-vehicle information system, AVICS in development. With AVICS, the driver could get the various information on traffic, news, weather, restaurants, and so on, which the AVICS information center provides via mobile telecommunication network. The driver requests the information to operator in center by voice with hands-free system or by handling the menu offered in the form of web-page. The in-vehicle unit for AVICS is designed to interface with wireless network with a built-in RF MODEM, to control NAVI system, and to display the information on the LCD monitor of AV system. The Internet browser is customized to parse specific HTML tags, application software is realized on 32-bit RISC processor. In this paper, we will overview the concept of AVICS and focus on development of in-vehicle unit of AVICS.
Technical Paper

Stop and go cruise control

2000-06-12
2000-05-0368
This paper will address the basic requirements for realizing a stop and go cruise control system. Issues discussed comprise: functional, sensor and basic HMI requirements, primary characterization of naturalistic stop and go driving, and the basic approach of the transformation of situational knowledge in an elementary controller.
Technical Paper

Adaptive, real-time traffic control management

2000-06-12
2000-05-0374
This paper presents an architecture for distributed control systems and its underlying methodological framework. Ideas and concepts of distributed systems, artificial intelligence, and soft computing are merged into a unique architecture to provide cooperation, flexibility, and adaptability required by knowledge processing in intelligent control systems. The distinguished features of the architecture include a local problem solving capability to handle the specific requirements of each part of the system, an evolutionary case-based mechanism to improve performance and optimize controls, the use of linguistic variables as means for information aggregation, and fuzzy set theory to provide local control. A distributed traffic control system application is discussed to provide the details of the architecture, and to emphasize its usefulness. The performance of the distributed control system is compared with conventional control approaches under a variety of traffic situations.
Technical Paper

Map database for ITS and driver assistance

2000-06-12
2000-05-0371
Today''s maturing navigable map database serves as one of the cornerstones needed for the development and growing commercial success of ITS applications worldwide. Beyond convenience and commercial success, tomorrow''s map database will help make the automotive environment progressively safer and more secure.
X