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2018-01-12
Journal Article
2018-01-9626
Marcus Schmitz, Lena Rittger, Henning Kienast, Alexandra Neukum
Potential collisions with oncoming traffic while turning left belong to the most safety-critical situations with ~25% of all intersection crossing path crashes. A Left Turn Assist (LTA) was developed to reduce the number of crashes. Crucial for the effectiveness of the system is the design of the human machine interface, i.e. defining how the system uses the calculated crash probability in the communication with the driver. A driving simulator study was conducted evaluating a warning strategy for two use cases: firstly, the ego-vehicle comes to a stop before turning (STOP), and secondly, the driver moves on without stopping (MOVE). 40 drivers drove through three STOP and two MOVE scenarios. For the STOP scenarios, the study compared the effectiveness of an audio-visual warning with an additional brake intervention and a baseline. For the MOVE scenarios, the study analyzed the effectiveness of the audio-visual warning against a baseline.
2018-01-12
Journal Article
2018-01-9275
Hamed Kheshtinejad, Mirko Baratta, Danilo Laurenzano, Claudio Maino, Daniela Anna Misul
CNG is at present retaining a growing interest as a factual alternative to traditional fuels for SI engines, thanks to its high potentials in reducing the engine-out emissions. Increasing thrust into the exploitation of NG in the transport field is in fact produced by the even more stringent emission regulations that are being introduced into the worldwide scenario. The present paper aims at deeply investigating into the potentials of a heavy-duty engine running on CNG and equipped with two different injection systems, an advanced single point (SP) one and a prototype multi-point (MP) one. The considered 7.8-liter engine was designed and produced to implement a SP strategy and hence modified to run with a dedicated MP system. A thorough comparison of the engine equipped with the two injection systems has been carried out at steady state as well as at transient operations.
2017-10-31
White Paper
WP-0002
The environmental impact of hydrocarbon-burning aircraft, both from the perspective of gas emissions and that of noise, is one of the main motivations for the move to electric propulsion. The added benefit from this shift to electric propulsion is that it has resulted in lowering the costs of electrical components such as motors, power electronic (PE) circuits, and batteries that are essential to this technology. This white paper seeks to explore the history, architecture, electrical components, and future trends of electric flight technology.
2017-10-31
White Paper
WP-0003
Actuators are the key to sophisticated machines that can perform complex tasks previously done by humans.
2017-10-31
White Paper
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.
2017-10-25
Technical Paper
2017-01-7009
Genghua Liao, Shaoyun Sun, Kelong Lu, Qiang Fu, Kecheng Pan, Heinz Friz, Bo Li
The implementation of an advanced process for the aerodynamic development of cab-over type heavy trucks at FAW requires a rigorous validation of the tools employed in this process. The final objective of the aerodynamic optimization of a heavy truck is the reduction of the fuel consumption. The aerodynamic drag of a heavy truck contributes up to 50% to the overall resistance and thus fuel consumption. An accurate prediction of the aerodynamic drag under real world driving conditions is therefore very important. The tools used for the aerodynamic development of heavy trucks are wind tunnels and CFD. Wind tunnels have a number of limitations which make it difficult to predict on road performance of the truck. Such limitations are limited availability, blockage and pressure gradient effects, lack of road simulation and Reynolds number effects. While on the other hand CFD does not have such limitations the accuracy of CFD is often questioned and needs to be proven.
2017-10-23
Technical Paper
2017-01-7008
Yoshiharu Inaguma
This article describes cavitation in a hydraulic disk valve to control an inlet pressure by changing a valve opening at a constant flow rate and outlet pressure. A disk valve, which has a fundamental configuration of a poppet valve, is widely used in a hydraulic system such a power steering system in order to control flow and pressure in the system. The disk valve, which makes a large flow area with a small valve opening, has a simple construction and does not reqire its parts to be machined with severe torelances. The disk valve with a diverging flow, however, is apt to cause cavitation because the inlet pressure becomes lower than the outlet pressure in a gap between the nozzle seat and the disk. The cavitation affects the pressure control performance and thrust force and causes an unpleasant noise. Hence, the cavitation is a very important problem because the hydraulic system is used recently under a high pressure condition.
2017-10-20
WIP Standard
AIR5128B
This SAE Aerospace Information Report (AIR) is limited to the subject of aircraft fuel systems and the questions concerning the requirements for electrical bonding of the various components of the system as related to Static Electric Charges, Fault Current, Electromagnetic Interference (EMI) and Lightning Strikes (Direct and Indirect Effects). This AIR contains engineering guidelines for the design, installation, testing (measurement) and inspection of electrical bonds.
CURRENT
2017-10-20
Standard
AMS5122K
This specification covers a carbon steel in the form of strip.

This material hs been used typically for washers and other stamped parts requiring a smooth finish and only slight or no forming, but usage is not limited to such applications.

CURRENT
2017-10-20
Standard
AMS5031G
This specification covers a low-carbon steel in the form of covered welding electrodes.
2017-10-20
WIP Standard
AS1895E
This SAE Aerospace Standard establishes the requirements for a V-retainer coupling, flanges, and seal suitable for joining high pressure and high temperature ducting in aircraft bleed air systems. The rigid coupling joint assembly, hereafter referred to as “the joint”, shall operate within the temperature range of -65 to +1200 °F.
2017-10-20
WIP Standard
AS4108C
This specification defines the requirements for A286 cres T-bolts and eye bolts, with room temperature tensile strength of a minimum of 160000 psi, for use with clamps and V-band couplings at 1000 °F maximum ambient temperature.
2017-10-19
Article
The all-new, tenth-generation Accord is Honda's best-ever- and makes the case for why crossovers shouldn't take over the planet.
2017-10-19
WIP Standard
TS145AR-5
No Scope available.
CURRENT
2017-10-19
Standard
AMS03_27A
This SAE Standard specifies the requirements for the nickel-plating of ferrous metals, copper alloys, aluminum alloys and zinc alloys for one or more of the following purposes: a. the production of wear-resistant surfaces; b. the building up of worn or over-machined surfaces; c. corrosion resistance; d. to provide an undercoat for subsequent deposits, e.g., chromium.
Viewing 1 to 30 of 172719