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Viewing 1 to 30 of 1555
2014-04-20
Journal Article
2014-01-9098
Ala Qattawi, Mahmoud Abdelhamid, Ahmad Mayyas, Mohammed Omar
1 The manufacturing of Origami based sheet metal products is a promising technology, mostly in terms of reducing the tooling and process complexity. This procedure can also be called fold forming, as it depends on exclusively shaping the required geometry via sequence of bends. However, the design analysis and modeling of folded sheet metal products are not fully mature, especially in terms of determining the best approach for transferring the analysis from a three-dimensional (3D) to a two-dimensional (2D) context. This manuscript discusses the extension of the Origami technique to the fold forming of sheet metal products represented in modeling approach and design considerations for the topological variations, the geometrical validity, and the variance of stress-based performance. This paper also details the optimization metrics that were developed to reflect the design and manufacturing differences among the possible topological and geometrical options for a single part design.
2015-05-01
Journal Article
2015-01-9082
Branislav Sredanovic, Djordje Cica
Abstract The most efficient way to reduce friction and heat generation at the cutting zone is to use advanced cooling and lubricating techniques. In this paper, an experimental study was performed to investigate the capabilities of conventional, minimal quantity lubrication (MQL) and high pressure cooling (HPC) in the turning operations. Process parameters (feed, cutting speed and depth of cut) are used as inputs to the developed artificial neural network (ANN) and the adaptive networks based fuzzy inference systems (ANFIS) model for prediction of cutting forces, tool life and surface roughness. Results obtained by the models have been compared for their prediction capability with the experimentally determined values and very good agreement with experimental results was observed.
2001-07-09
Technical Paper
2001-01-2201
Thomas J. Hagale
There are a large number of space structures, orbital replacement units (ORUs) and other components that must be transported to orbit on a regular basis for the assembly and maintenance of the International Space Station (ISS). Some of this hardware will be ferried on the Spacelab Logistics Pallet (SLP), which has a long and reliable history of space flight successes. The carrier is well used, well qualified, and very adaptable for repeated use in accommodating cargoes of various sizes and shapes. This paper presents an overview of past, present and future hardware design solutions that accommodate EVA operations on the SLP. It further demonstrates how analysis techniques and design considerations have influenced the hardware development, EVA operations, and compliance with human engineering requirements for the SLP.
2016-08-16
Magazine
Types of aircraft passenger-escape systems An overview of existing and potential new methods for assuring aircraft occupant safety. SAE Skill India Initiative: S2I2 A new SAEINDIA collaboration aims to help young engineers acquire "industry-ready" skills. A technology-driven sustainable-agriculture solution Pumping more air into the cylinder is key to solving the CAFE puzzle, and engineers are hard at work figuring out the best ways to do it with turbocharger and supercharger innovation. Rotorcraft icing computational tool development 3D printing machines can't be built fast enough In the additive-manufacturing world, the costs of components are dropping, the technology is becoming more reliable and parts are fabricated faster, allowing industries beyond aerospace to adopt additive technologies, says Oak Ridge Lab's Ryan Dehoff.
2012-06-13
Magazine
The big boys go for plastic While it is true that the latest developments in advanced alloy manufacturing techniques can deliver structures and components that meet all the product requirements that aerospace primes need for new aircraft, there can be no escaping the fact that there is now an unstoppable momentum building up for the plastic airplane.
2012-12-12
Magazine
Joining metal/composite structures The interference-fit bolted joining of hybrid metal/composite can greatly improve the fatigue life of such joints, according to Chinese researchers.
2012-08-15
Magazine
Everything's looking up for aircraft with Internet connections Satellites will make global connectivity possible. Composite bonds put to the test The application of adhesive bonding as a joining technology for CFRP aircraft structures is essential for the realization of novel lightweight design concepts. Aerospace leads in additive manufacturing The unique advantages of making metal parts from powder-bed additive manufacturing are looking attractive to engine manufacturers. Europe's aerospace sector at a crossroads Europe is facing a massive black hole in its future defense procurement portfolio. What will replace today's fighters and trainers when the present order backlogs have been produced?
2011-06-29
Magazine
Machine tools meet new materials If you're in the business of making machine tools for aerospace applications, you're probably working on improvements in cutting tough metals and composites.
2014-11-05
Magazine
Adaptive trimming of composite parts Some of the techniques used in the Adaptive Manufacturing System are normal aerospace processes. The unique and enabling process is the scanning and adaptive trimming.
2015-04-01
Magazine
Propulsion Fanjet Evolution - the Next Steps Composites Dry Drilling Composites Using Carbon Dioxide Cooling
2013-11-06
Magazine
Simulation supports aircraft safety From analyzing crashes to hard landings, the industry is evolving in how much it relies on CAE simulation to provide safer aircraft designs. As aircraft systems become more complex, simulation itself is evolving as well.
2009-11-12
WIP Standard
AIR64C
This document considers the cooling of equipment installed in equipment centers, which usually consist of rack-mounted equipment and panel mounted equipment in the flight deck. In instances where these two locations result in different requirements, these are identified. For purposes of this document, the cooled equipment is referred to generally as E/E equipment, deonting that both electrical and electronic equipment is considered, or as an E/E equipment line-replaceable-unit (LRU). The majority of cooled equipment takes the form of LRUs. This document primarily relates to E/E equipment which is designed to use forced air cooling in order to maintain the equipment operating performance (within acceptable tolerances), and to maintain reliability. Cooling may be applied internally or externally to the case of the item of E/E equipment. There are also E/E equipment items which are cooled by natural convection, conduction, and radiation to the surrounding environment.
2016-09-10
WIP Standard
AIR1811B
The purpose of this Aerospace Information Report (AIR) is to provide guidelines for the selection and design of airborne liquid cooling systems. This publication is applicable to liquid cooling systems of the closed loop type and the expendable coolant type in which the primary function is transporting of heat from its source to a heat sink. Most liquid cooling system applications are oriented toward the cooling of electronics. Liquid cooling techniques, heat sinks, design features, selection of coolants, corrosion control, and servicing requirements for these systems are presented. Information on vapor compression refrigeration systems, which are a type of cooling system, is found in Reference 1.
2003-04-01
Magazine
The dawn of the jet age: the first 10 years One of the ironies of aviation history is that the most obvious potential power source for a fixed-wing aircraft was barely considered by the early pioneers. Airflow simulation for winglets Embraer engineers used CFD to visualize flow patterns around wings for a design retrofit. Aircraft-engine-mounting analysis Engineers from Honeywell adapted a rapid analysis approach to develop and validate a complex propulsion system. Reshaping F-16 production Following its contract with the Joint Strike Fighter program, Lockheed Martin is reconfiguring its F-16 assembly line in preparation for long-term JSF production starting later this year.
2009-04-01
Magazine
Improving power quality Avionics power supplies are being redesigned to reduce harmonic distortion and work with wild frequencies. Think smart As aerospace manufacturers and suppliers continually look for new ways to improve passenger safety and comfort, an increasing emphasis is being placed on the role of advanced, 'smart' interiors. Getting it together The manufacture and assembly of today's aircraft must be in line with market needs and emerging technologies in a challenging business environment.
2008-04-01
Magazine
Carbon fiber gets bigger footprint Manufacturers strive for the Holy Grail of composites manufacturing: consistency and repeatability. Safety on the floor Once add-ons that brought almost as many problems as benefits, safety techniques are now being designed into equipment before start-up. Taking measures of the machine New requirements and technologies advance the art of test and sensing. Looking, listening, recording, analyzing HUMS is established as an integral part of aviation's safety network, but more standardization is needed to broaden its effectiveness.
2008-05-01
Magazine
Clean, quiet commercial propulsion Engine manufacturers design future engines to meet noise, pollution, and fuel economy needs. Robots take over Dramatic changes in areas as diverse as semiconductor costs, software tools, and the trend toward regional aircraft are creating opportunities for airplane manufacturers to automate their factories. Rapid prototyping to rapid manufacturing Durable, temperature-resistant powders and materials enable the manufacture of complex components. The research race Aerospace R&D funding in the U.S. is on the upswing, but new priorities create challenges for universities.
2002-05-01
Magazine
The future of aircraft manufacturing Engineers from Vought Aircraft offer insight into the challenges, trends, and techniques that aerospace manufacturers will have to consider for maintaining a viable manufacturing environment. High-speed spindles for aircraft manufacturing Aerospace companies such as Boeing and AHF-Ducommun have employed various high-speed spindles from Precise to improve machining accuracy and finish of aerospace components. Making advanced composites Lockheed Martin Space Systems explores several methods to improve quality and reduce costs. Turbine blade machining To ensure more efficient grinding of its turbine blades, Rolls-Royce installed Midwest Engineered Products' CentraSep centrifuge for automatic filtering of cutting oil.
2004-05-01
Magazine
Advancing the art of manufacturing Use of new manufacturing tools and techniques are allowing aircraft makers to deliver their products faster. A materialistic industry Deciding which material is best suited to construct a part or plane is one of the most complex issues an aerospace engineer faces. Speeding up engine manufacture Fiber optics play a big role in percussion drilling tiny holes.
2002-07-01
Magazine
Next-generation space transportation NASA narrows its search for a successor to the Space Shuttle. Air-traffic-control modernization "Aerospace Engineering" provides an update of the latest air-traffic management activities taking place in the U.S. and China. Aircraft undercarriage concept Engineers at SUS21 Co. Inc. and the Kyoto Institute of Technology have developed an aircraft suspension system that features shock isolation to reduce abrupt deceleration and impact force on aircraft wheels. Simulating Superplastic forming BAE Systems' engineers developed modeling tools and techniques to optimize superplastic forming of titanium structures.
2001-07-01
Magazine
Giving ice the boot Atmospheric icing was for many years one of the majoy threats to aircraft safety- and it potentially still is. Researchers at Dunlop Aviation Ice Protection and Composites continue their development of deicing and anti-icing technologies. The art of wing assembly Airbus Industries investigates new technologies and techniques for improving quality and reducing cost of its wing box assemblies. Affordable engines for small aircraft A look into the new technologies developed for small-aircraft engines as extensions to the cooperative agreements under the NASA General Aviation Propulsion program conclude.
Viewing 1 to 30 of 1555

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