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Viewing 1 to 30 of 2199
2016-10-17
Journal Article
2016-01-2328
Edward Chappell, Richard Burke, Pin Lu, Michael Gee, Rod Williams
The discrepancies between certification and on-road vehicle performance is becoming increasingly important as emissions and fuel consumption estimates are proving inaccurate predictors of in-service behaviour. The objective of this paper is to identify and analyse these differences and the work forms the first phase of a project aiming to create new, highly repeatable test methods to measure very small differences in powertrain performance whilst being representative of real world conditions. These new methodologies will be developed on an advanced chassis dynamometer facility and facilitate the development of future fuel technologies focussed on delivering real world benefits. The engine controller of a 2.0L Diesel vehicle with active de-NOx and particular filter (DPF) has been monitored over WLTC and NEDC cycles and 12000km of on-road driving. Different filtering and data representation methods are compared to aid in the analysis and understanding of on-road data.
2016-09-28
WIP Standard
AS4841B
This SAE Aerospace Standard (AS) establishes the requirements for 37 degree flared tube fittings or machined internal cone fluid connection fittings for use with 37 degree external cone, spherical nose and seal ring fittings in all types of aerospace fluid systems (see Section 6).
2016-09-27
Journal Article
2016-01-8017
Eric Wood, Adam Duran, Kenneth Kelly
Abstract In collaboration with the U.S. Environmental Protection Agency and the U.S. Department of Energy, the National Renewable Energy Laboratory has conducted a national analysis of road grade characteristics experienced by U.S. medium- and heavy-duty trucks on controlled access highways. These characteristics have been developed using TomTom’s commercially available street map and road grade database. Using the TomTom national road grade database, national statistics on road grade and hill distances were generated for the U.S. network of controlled access highways. These statistical distributions were then weighted using data provided by the U.S. Environmental Protection Agency for activity of medium- and heavy-duty trucks on controlled access highways. The national activity-weighted road grade and hill distance distributions were then used as targets for development of a handful of sample grade profiles potentially to be used in the U.S.
2016-09-27
Journal Article
2016-01-8018
Houshun Zhang, L. James Sanchez, Matthew Spears, Jayant Sarlashkar, Dennis Robertson, Michael Ross
Abstract In June of 2015, the Environmental Protection Agency and the National Highway Traffic Safety Administration issued a Notice of Proposed Rulemaking to further reduce greenhouse gas emissions and improve the fuel efficiency of medium- and heavy-duty vehicles. The agencies proposed that vehicle manufacturers would certify vehicles to the standards by using the agencies’ Greenhouse Gas Emission Model (GEM). The agencies also proposed a steady-state engine test procedure for generating GEM inputs to represent the vehicle’s engine performance. In the proposal the agencies also requested comment on an alternative engine test procedure, the details of which were published in two separate 2015 SAE Technical Papers [1, 2]. As an alternative to the proposed steady-state engine test procedure, these papers presented a cycle-average test procedure.
2016-09-20
Technical Paper
2016-01-2039
Prashant S. Vadgaonkar, Ullas Janardhan
Avionics industry is moving towards fly-by wire aircrafts with less reliance on mechanical systems leading to increase in the complexity of in-flight hardware elements. RTCA/DO-254 and EUROCAE ED-80 plays a vital role in the design assurance of airborne electronic hardware. RTCA/ DO-254 and EUROCAE ED-80 are the industry standards for Design Assurance Guidance for Airborne Electronic Hardware. The two different agencies FAA and EU regulate and apply this design assurance guidance to the regulatory law in CFR and EASA CS respectively. This paper discusses the need for DO-254 /ED-80 certification in Aerospace industry, the advantages and benefits to the avionics manufacturers. The paper presents the study made on similarities and differences between DO-254/ED-80.
2016-09-20
Technical Paper
2016-01-2044
Jeffrey J. Joyce, Scott Beecher, Laurent Fabre, Ramesh Rajagopalan
Abstract Over the past few decades, advanced methods have been developed for the analysis of digital systems using mathematical reasoning, i.e., formal logic. These methods are supported by sophisticated software tools that can be used to perform analysis far beyond what is practically achievable using “paper and pencil” analysis. In December 2011, RTCA published RTCA DO-178C [1] along with a set of technical supplements including RTCA DO-333 [2] which provides guidance on the use of formal methods towards the certification of airborne software. Such methods have the potential to reduce the cost of verification by using formal analysis instead of conventional test-based methods to produce a portion of the verification evidence required for certification.
2016-09-20
Technical Paper
2016-01-2047
K. Suresh, Rajkumar Dhande, Udupi Ananthakrishna Acharya
Reducing the amount of physical testing is of importance in the aeronautical industry, where each physical test represents a significant cost. Apart from the cost aspect, it may also be difficult or hazardous to carry out physical testing. Specific to the aeronautic industry are also the relatively long development cycles, implying long periods of uncertainty during product development. In any industry a common viewpoint is that of verification, validation, and uncertainty quantification using simulation models are critical activities for a successful development of a product. In Aeronautical application, the design of store’s related structural parts needs to be certified in accordance with MIL-T-7743F [1]. This paper focuses on a case study for shock analysis, whereby an attempt has been made to reduce the cost of certification by way of replacing the actual physical testing by a reliable high fidelity FE simulation.
2016-09-18
Journal Article
2016-01-1925
David B. Antanaitis
Abstract The strong focus on reducing brake drag, driven by a historic ramp-up in global fuel economy and carbon emissions standards, has led to renewed research on brake caliper drag behaviors and how to measure them. However, with the increased knowledge of the range of drag behaviors that a caliper can exhibit comes a particularly vexing problem - how should this complex range of behaviors be represented in the overall road load of the vehicle? What conditions are encountered during coastdown and fuel economy testing, and how should brake drag be measured and represented in these conditions? With the Environmental Protection Agency (amongst other regulating agencies around the world) conducting audit testing, and the requirement that published road load values be repeatable within a specified range during these audits, the importance of answering these questions accurately is elevated. This paper studies these questions, and even offers methodology for addressing them.
2016-09-16
Journal Article
2016-01-9019
Jan Grüner, Stefanie Marker
Abstract Standardized driving cycles, such as the New European Driving Cycle (NEDC) in Europe or the Federal Test Procedure 75 (FTP-75) in the U.S. are an important tool to certify new vehicle models. They are used to estimate real world fuel consumption as well as real world emissions. The latter has recently become more important with the stronger focus on green driving, resulting in much stricter emission regulations, while fuel consumption still remains one of the most important aspects in terms of economy and long term costs for the vehicle owner. However these cycles do not reflect the actual behaviour of the driver or regional influences (i.e. topography). Therefore, manufacturers have developed their own usage and test cycles and are able to extract data from the vehicle to analyse the individual driving behaviour and vehicle usage. Apart from that, Naturalistic Driving Observation (NDO) is interested in understanding the driver.
2016-08-16
WIP Standard
AS4211E
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS4220D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS4210E
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS4224D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS4807D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications. Correct the “V” dimension for size 10.
2016-08-16
WIP Standard
AS4221D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS5002D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications..
2016-08-16
WIP Standard
AS5003D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS4809D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS5004D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
CURRENT
2016-06-17
Standard
EIA599A
This Standard is applicable to suppliers of electronic components, assemblies, equipment and related materials. This standard establishes the general requirements to achieve a certified process. The use of this standard is intended for any manufacturing or service company whose goal is to achieve customer satisfaction through continuous improvement.
2016-05-17
WIP Standard
JA6268
This Aerospace Recommended Practice (ARP) was created to help industry deal with existing barriers to the successful implementation of Integrated Vehicle Health Management (IVHM) technology in the aerospace and automotive sectors. That is,given the common barriers that exist, this ARP can be applied not only to aerospace but also to the automotive, commercial and military vehicle sectors. Original Equipment Manufacturers (OEMs) in all of these sectors are heavily dependant upon a large number of component suppliers in order to design and build their products. The advent of IVHM technology has accentuated the need for improved coordination and communication between the OEM and its suppliers –to ensure that suppliers design health ready capabilities into their particular components.
2016-05-17
WIP Standard
AIR6245
This document is applicable to military aircraft where stakeholders are seeking guidance on the development and approval of Structural Health Monitoring (SHM) technologies and on the integration of these technologies into encompassing maintenance and operational support systems. The document will refer to those guidelines prepared under SAE ARP6461 that are relevant and applicable to military applications.
2016-05-04
WIP Standard
AIR5120A
This document has been declared "CANCELLED" by the E32 committee as of April 2016 and has been superseded by ARP5120. By this action, this document will remain listed in the Numerical Section of the Aerospace Standards Index noting that it is superseded by ARP5120. Cancelled specifications are available from SAE.
2016-04-22
WIP Standard
ARP6904
In order to realize the benefits of Integrated Vehicle Health Management (IVHM) within the aerospace and defense industry there is a need to address five critical elements of data interoperability within and across the aircraft maintenance ecosystem, namely • Approach • Trust • Context • Value • Security In Integrated Vehicle Health Management (IVHM) data interoperability is the ability of different authorized components, systems, IT, software, applications and organizations to securely communicate, exchange data, interpret data, use the information and derive consistent insight from the data that has been exchanged to derive value.
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