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Viewing 61 to 90 of 20491
2016-09-20
Technical Paper
2016-01-1996
David R. Markham, J. Michael Cutbirth
High-speed screw compressors are a common refrigeration compressor because they are highly reliable, compact, and have a high turndown ratio. For modern aviation and mobile platforms screw compressors are advantageous because they can achieve high cooling capacities within a compact package. This present study describes the performance results of a custom asymmetric screw compressor that can meet strict size, weight, and power (SWaP) requirements. Compressor testing was performed to validate the design, modeling, and fabrication processes. The compressor, with a nominal cooling capacity of 50 kW, was tested over a range of saturated suction conditions, pressure ratios, rotational speeds, and oil lubrication conditions.
2016-09-20
Technical Paper
2016-01-2063
Beata I. Wawrzyniak, Jagadeesh Tangudu
Induction machines in general are considered work horse for typical industrial applications due to its rugged, reliable and inexpensive nature; however, their low power density restricts their use in volume and weight limited environments such as an aerospace application. With recent advancements in additive manufacturing technology, researchers believe it is possible to improve power density by taking advantage of higher slot fill factor (defined as ratio of bare copper area to slot area) achieved by deposition of copper in much more compact way than a conventional manufacturing of winding. The objective of proposed paper was to perform a design tradeoff study for an induction motor with increased slot fill factor. A traction/propulsion motor application was selected for this study due to its aggressive requirements for an electric machine, which include: high power density, high constant power to speed ratio and high efficiency.
2016-09-20
Technical Paper
2016-01-2060
Vijay Jagdale, Jagadeesh Tangudu
It is desired to reduce stator end winding length and mass to reduce associated resistive losses, increase efficiency and power density of an induction motor. With recent advancements in additive manufacturing technology, it is possible to deposit copper conductive paths and insulation layers in a selective controlled manner. This enables more compact end winding designs. The objective of this paper is to present a topology optimization based approach for design of stator end winding to minimize its overall length, volume and mass. Design approach and parametric study results for a representative stator design are presented in this paper. By reducing length of end winding, efficiency and power density of the induction motor can be increased enabling benefit realization for weight critical aerospace applications and potentially reducing rare-earth dependency.
2016-09-18
Technical Paper
2016-01-1957
Seonho Lee, Heejae Kang, Ohchul Kwon, Chirl Soo Shin
A trend in automotive parts development is the pursuit of long life, high quality and reliability. The increase in service life of automotive wheel bearings, by improving the rolling contact fatigue (RCF) life of bearing steels, was investigated. Conventional studies of bearing steels and heat treatments have dealt with quenching and tempering (Q/T) in 52100 steel. This study is a new trial to increase the strength of bearing steels by special austempering in phases after general Q/T heat treatments.
2016-09-14
Technical Paper
2016-01-1878
Yuxiang Feng, Pejman Iravani, Chris Brace
The autonomous control strategy of an off-road All-Terrain Vehicle was developed on Robot Operating System (ROS). Both the position estimation and autonomous control were performed on ROS. The quad vehicle is front wheel steered with rear wheel driving, and possesses Ackermann geometry. It was powered by a brushless 36V DC motor. It can be wirelessly controlled through a TP-LINK router. The vehicle only sends out sensory measurements and receives control commands, and all computations are performed on external devices. For the position estimation phase, sensory data from GPS, IMU and wheel odometry were acquired and processed on the platform. In accordance with the ROS architecture, separate packages were developed for each sensor. Afterwards, Extended Kalman filter was performed to fuse these sensory measurements to achieve an optimizing accuracy. Necessary conversion and normalization were also conducted prior to data fusion, such as conversion from LLA to ENU for GPS measurements.
2016-07-25
WIP Standard
AMS6520E
This specification covers a premium aircraft-quality, maraging steel in the form of sheet, strip, and plate.

These products have been used typically for large booster rocket applications, pressure vessels, and other components requiring through-hardening, without quenching, to a yield strength of 245 ksi (1689 MPa) or higher, but usage is not limited to such applications.

2016-07-21
Standard
AMS4359
This specification covers an aluminum alloy in the form of extruded rods, bars, and profiles (shapes) 0.040 to 1.500 inches (1.02 to 38.10 mm), inclusive, in thickness, and produced with maximum cross sectional area of 23.25 in2 (15000 mm2) and a maximum circumscribing circle diameter (circle size) of 15.5 inches (394 mm) (see 8.4.1).
2016-07-17
Article
In concert with partner AK Steel, NanoSteel has finally brought its new sheet steel to the production threshold as the industry gobbles high-strength, lighter weight alloys at an increasing rate.
2016-07-15
Article
ZF has initiated the “Wind of Change” campaign to reinforce its supplier base in the Indian market. In an announcement on ZF India Supplier Day, the company said it aims to reach EUR100 million worth of export from India by 2017.
2016-07-13
WIP Standard
AMS4367
This specification covers an aluminum alloy in the form of extruded rods, bars, and profiles (shapes) produced with maximum cross sectional area of 55.5 square inches (35 806 mm2) and a maximum circumscribing circle diameter (circle size) or 24.4 inches (620 mm)
2016-07-13
WIP Standard
AMS4374
This specification covers an aluminum alloy in the form of extruded rods, bars, and profiles (shapes) produced with maximum cross sectional area of 56.1 square inches (36 193 mm2) and a maximum circumscribing circle diameter (circle size) or 20.2 inches (513 mm)
2016-07-08
WIP Standard
AMS5666J
This specification covers a corrosion and heat-resistant nickel alloy in the form of bars, forgings, extrusions, flash welded rings, and stock for forging, extruding, or flash welded rings up to 10 inches (254 mm) in diameter or least cross-sectional dimension (see 8.5).
2016-07-07
Magazine
Technology report Quest for 'new-car smell' dictates interior-materials changes Doing it again-this time with 10 After a successful decade-long collaboration on 6-speed transaxles, Ford and GM partner again on an all-new 10-speed automatic. Here's a look inside the gearbox and the project. Large-scale additive manufacturing for rapid vehicle prototyping A case study from Oak Ridge National Laboratory bridges the 'powertrain-in-the-loop' development process with vehicle systems implementation using big area additive manufacturing (BAAM). Global Vehicles Steel-intensive Mazda CX-9 sheds mass, debuts novel turbo setup
2016-07-07
WIP Standard
G16AA
This specification covers a titanium alloy in the form of bars, wire, forgings, rings, and drawn shapes.
2016-06-28
Article
Linde LLC's Hydroflex atmosphere control system (ACS) is a solution for clean and bright oxide-free annealing of steel, stainless steel, copper, bronze or brass with high reliability and repeatability and is suitable for applications including automotive, aerospace and military components, construction and industrial equipment and electrical systems.
2016-06-28
Article
Renishaw offers an enhanced probing software package that automatically optimizes on-machine measurement cycles to minimize cycle time and maximize productivity.
2016-06-28
Standard
EIA511
The Manufacturing Message Specification is an application layer standard designed to support messaging communications to and from programmable devices in a Computer Integrated Manufacturing (CIM) environment. This environment is referred to in this standard as the manufacturing environment. This standard does not specify a complete set of services for remote programming of devices, although provision or such a set of services may be subject of future standardization efforts.
2016-06-28
WIP Standard
AMSF7190B
This specification covers steel forgings suitable for use in the construction of aircraft/aerospace equipment, special ordnance, and related accessories.
2016-06-27
WIP Standard
AMS6438G
This specification covers a premium aircraft-quality, low-alloy steel in the form of sheet strip, and plate.
2016-06-25
WIP Standard
AMS6426F
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
2016-06-23
Standard
AMS6277H
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
2016-06-23
Standard
AMS3411E
This specification covers a silver brazing flux in the form of paste.
2016-06-22
Standard
AMS3410K
This specification covers a silver-brazing flux in the form of a paste.
2016-06-21
Standard
AMS5662N
This specification covers a corrosion and heat-resistant nickel alloy in the form of bars, forgings, flash welded rings, and stock for forging, flash welded rings, or heading 10.00 inches (254 mm) and under in nominal diameter or least distance between parallel sides, having a maximum cross-sectional area of 78 in2 (503 cm2), and forging stock of any size (see 8.5).
2016-06-20
Article
In the additive manufacturing world, the costs of components are dropping, the technology is becoming more reliable and parts are fabricated faster. This is allowing industries such as automotive to adopt additive technologies, says Oak Ridge Lab's Ryan Dehoff.
2016-06-20
Standard
AMS5663N
This specification covers a corrosion and heat-resistant nickel alloy in the form of bars, forgings, flash welded rings up to 10 inches (254 mm) in least cross-sectional dimension, having a maximum cross-sectional area of 78 in2 (503 cm2), and stock of any size for forging or flash welded rings (see 8.5).
2016-06-20
Standard
AMS5666H
This specification covers a corrosion and heat-resistant nickel alloy in the form of bars, forgings, extrusions, flash welded rings, and stock for forging, extruding, or flash welded rings up to 10 inches (254 mm) in diameter or least cross-sectional dimension (see 8.5).
2016-06-16
Standard
EIA441
This standard is intended to serve as a guide in the coordination of system design to promote uniformity of the nomenclature and description of the operator devices.
2016-06-16
Standard
EIAAB3D
Scope is unavailable.
2016-06-16
Standard
RS274D
This standard is intended to serve as a guidein the coordination of system design, to minimize the variety of program manuscripts required, to promote uniformity of programming techniques, and to foster interchangeability of input data between numerically controlled machines of the same classification by type, process function, size, and accuracy. It is intended that simple numerically controlled machines be programmed usinga simple format, which is systematically expandable for morec omplex machines.
Viewing 61 to 90 of 20491

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