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Technical Paper
2014-06-30
Bryce Gardner, Tiago Macarios
Abstract Speech transmissibility is a critical factor in the design of public address systems for passenger cabins in trains, aircraft and coaches. Speech transmissibility is primarily affected by the direct field, early low order reflections, and late reflections (reverberation) of the source. The direct and low order reflections are affected by the relative location of speakers and seats as well as the acoustic properties of the reflecting walls. To properly capture these early reflections, measures of speech transmissibility typically require time domain information. However, another important factor for speech transmissibility is background noise due to broadband exterior sources such as a flow noise sources. The background noise is typically modeled with broadband steady state assumptions such as in statistical energy analysis (SEA). This works presents an efficient method for predicting speech transmissiblity by combining ray tracing with SEA. In this method, the direct field and low order reflections are modelled using raytracing, while the reverberant field and background noise are modelled using SEA.
Technical Paper
2014-06-30
Alessandro Zanon, Michele De Gennaro, Helmut Kuehnelt, Domenico Caridi, Daniel Langmayr
Abstract In hybrid and electrical vehicles new challenges in meeting the drivers' expectation with regards to acoustic comfort arise. The absence of the internal combustion engine noise enhances the passengers' perception of other noise sources, such as the Heating, Ventilation and Air-Conditioning (HVAC) system. Therefore efficient and reliable numerical models able to predict flow-induced broadband noise have become a major research topic in automotive industry. In this framework, the Zonal LES coupled with the Ffowcs Williams-Hawkings (FWH) acoustic analogy are capable to simulate broadband noise from low speed axial fan. As demonstrated in previous works from the authors, this approach is able to cope with the complexity of the physical phenomena involved (i.e. turbulent noise generation, laminar-to-turbulent transition, etc.), even though the numerical model requires a careful setup of the mesh topology, boundary conditions and simulation parameters. The aim of this article is to provide the scientific community with the latest developments of our research work on numerical modelling of broadband noise from axial fans, focusing on the performance of two different mesh topologies to locate and estimate the noise sources.
Technical Paper
2014-06-30
Jean-Francois Rondeau, Ludovic Dejaeger, Antoine Guellec, Arnaud Caillet, Lars Bischoff
Abstract Strategies for weight reduction have driven the noise treatment advanced developments with a great success considering the already mastered weight decreases observed in the last years in the automotive industry. This is typically the case for all soft trims parts. In the early 2010's a typical european B-segment car soft trims weights indeed 30 to 40% less than in the early 2000's years. The main driver behind such a gap has been to combine insulation and absorption properties on a single part while increasing the number of layers. This product-process evolution was conducted using a significant improvement in the simulation capacities. In that sense, several studies presenting very good correlation results between Transmission Loss measurements and finite elements simulations on dashboard or floor insulators were presented. One may consider that those kinds of parts have already achieved a considerable improvement in performance. But the challenge of weight reduction continues due to up-coming CO2 emissions regulations.
Technical Paper
2014-06-30
Ki-Sang Chae, Seung Hwan Lim, Ji Woo Yoo, Seok-Gil Hong
Abstract Dash panel is the most important path of structure-borne and air-borne interior noise for engine-driven vehicles. Reinforcements, which are added to dash panel, are mainly designed in order to suppress the structure-borne noise contribution from the dash panel. However, the effects of dash reinforcements do not seem clear in the viewpoint of air-borne noise. In this paper, the insulation performance of a dash structure with spot-welded reinforcements is studied through several STL (Sound Transmission Loss) tests and STL simulations. The results of this study could be utilized for increasing the sound insulation performance of vehicle body structure.
WIP Standard
2014-06-30
This SAE Recommended Practice describes how to position and posture the H-point design tool (HPD) described in Appendix B, and how to establish the seating reference point (SgRP), design H-point travel path, and other key reference points that are used in the design and specification of both driver and passenger seat positions. This practice also provides a method for determining the length of the seat track for a driver seat that adjusts fore/aft. The seat track length is based on a desired level of driver accommodation, assuming a U.S. population containing an equal number of male and female drivers. The procedure can be used to establish driver seat track accommodation for new vehicle designs or to evaluate accommodation in existing vehicles. A general method for determining driver seat track length for any driver population (male and female stature distribution) at any selected accommodation percentile and gender mix is given in Appendix A. Application of this document is limited to Class A Vehicles (Passenger Cars, Multipurpose Passenger Vehicles, and Light Trucks) as defined in SAE J1100.
Article
2014-06-27
Ford Motor Co. debuted this week the only five-row side-curtain airbag in the automotive industry, according to a company release. The airbag, which is featured in the 2015 Transit 15-passenger wagon, is the largest in any Ford vehicle. 
WIP Standard
2014-06-27
This document provides dimension definitions that facilitate geometric quantification and evaluation of seats. This document has been designed for use in CAD, however, many dimensions require establishing HPM position and attitude. Refer to the appropriate document for these procedures. These dimensions are package independent in that they do not require use of the HPM-ll supplemental thigh/leg/shoe. Three types of seat geometry reference points and measurements have been developed. 1. Simple reference points and measurements not related to H-point 2. H-point dependent reference points and measurement that utilize the seat characterization capabilities of the HPM to quantify seat measurements 3. Cross sectional seat trim outlines For convenience and simplicity, many terms associated with H-point devices use human body parts in their name. However, they should not be construed as measures that indicate interaction with any or all occupants concerning accommodation, human capabilities, or comfort.
WIP Standard
2014-06-27
This recommended practice describes boundaries of hand control locations that can be reached by a percentage of different driver populations in passenger cars, multi-purpose passenger vehicles, and light trucks (Class A vehicles). This practice is not applicable to heavy trucks (Class B vehicles).
Article
2014-06-24
SAE International is gauging interest in development of an SAE recommended practice addressing the relationship between engine status and airbag functionality. Keith Wilson, Technical Project Manager, SAE Global Ground Vehicle Standards, wrote in a letter to members of relevant committee members under the SAE Motor Vehicle Council: "If sufficient industry support exists, our intent is to develop an SAE recommended practice for a minimum time or a motion-based metric for airbag systems to be active after ignition cutoff or loss of power.
Standard
2014-06-24
This SAE Aerospace Standard (AS) applies to performance and testing of solid chemical oxygen generators which produce oxygen at essentiall ambient pressure for use aboard aircraft whose cabin pressure altitude does not exceed 40,000 ft (about 12,200 m). Portable chemical oxygen devices are covered by AS1303.
WIP Standard
2014-06-23
This ARP covers the system design, human interface considerations, and hardware performance recommendations and requirements for touch interactive electronic display systems installed in the cockpit/flight deck for use by pilots. System design and human interface considerations include: identification of functions that could use and benefit from touch interactions, the pilot and cockpit/flight deck environment characteristics that impact usability, and specific pilot interface characteristics such as touch mode, single and multi touch applications, feedback, latency, potential human error, and basic usability. Also addressed are workload, fatigue, and transition from hard to soft control considerations. Hardware issues cover performance aspects of touch screens installed on cockpit/flight deck displays. This ARP is intended to cover Part 23 and 25 category airplanes as well as Part 27 and 29 rotorcraft.
Article
2014-06-20
The 2015 Mustang will feature a new design of an inflatable knee airbag, Ford announced June 20. Packaged inside the glove box, the new airbag provides protection comparable to its traditional counterparts, according to a release from Ford, but is 65% lighter and features an inflator that is 75% smaller, allowing for more room in the interior.
Article
2014-06-18
TRW Automotive has launched its next-generation seatbelt retractor, the Floating Spool 1 (FS1), which offers reduced weight (about 15% lighter) and smaller dimensions compared to previous systems, according to the company. Production of the global FS1 technology starts in the second quarter of 2014.
Article
2014-06-16
SAE International and the Consumer Electronics Association (CEA) have signed a two-year memorandum of understanding to build a cooperative partnership in the standardization of vehicle electronics and consumer electronics products to improve the driving experience.
WIP Standard
2014-06-16
This recommended practice is a source of information for body and trim engineers and represents existing technology in the field of on-highway vehicle seating systems. It provides a more uniform system of nomenclature, definitions of functional requirements, and testing methods of various material components of motor vehicle seating systems.
Article
2014-06-13
Volvo is making Dirac's "active acoustic treatment of the listening space" technology (called Unison) available in the new XC90 with the Bowers & Wilkins audio system. According to Dirac, Unison co-optimizes the loudspeakers in frequency, time, and space for the "best possible bass integration and clarity."
WIP Standard
2014-05-27
Methods will be developed to characterize In Flight Entertainment (IFE) component impact performance separate from seat design. These methods will address both initial seat head impact criterion (HIC) testing and subsequent IFE component changes. Methods will evaluate head blunt trauma, post-impact sharp edges, and egress impediment. Criteria development will involve defining test methods, test parameters, measurements, and acceptance criteria. Particular emphasis on evaluating IFE changes that require coordination and evaluation per SAE ARP 6448, Appendix B.
Standard
2014-05-20
This procedure is used to determine seam strength and seam fatigue of automotive textiles, vinyl coated fabrics and related soft trim materials.
Article
2014-05-19
Visteon's Horizon cockpit concept blends three emerging technologies—including 3-D gesture recognition—to transform the way a driver controls features such as interior temperature, audio, and navigation.
Article
2014-05-19
Design groups want chips that save space and reduce weight, so Maxim has focused on these challenges with a pair of products that reduce board space and let engineers transition to lighter-weight cabling.
Article
2014-05-19
A server is the central point for all Generation 2 Blue Link communication, giving Hyundai early, direct access to customers. The updated Blue Link now has Google Destination Search, a 3G modem, and a larger touchscreens in control stack.
Article
2014-05-19
In a deal that will create the world's largest automotive interiors company, U.S.-based Johnson Controls is forming a joint venture with China-based Yanfeng Automotive Trim Systems Co., Ltd., which is a unit of automaker Shanghai Automotive Industry Corp.
Standard
2014-05-16
This document provides informational background, rationale and a technical case to allow consideration of the removal of the magnesium alloy restriction in aircraft seat construction as contained in AS8049B. The foundation of this argument is flammability characterization work performed by the FAA at the William J. Hughes Technical Center (FAATC), Fire Safety Branch in Atlantic City, New Jersey, USA. The rationale and detailed testing results are presented along with flammability reports that have concluded that the use of specific types of magnesium alloys in aircraft seat construction does not increase the hazard level potential in the passenger cabin in a post-crash fire scenario. Further, the FAA has developed a lab scale test method, reference DOT/FAA/TC-13/52, to be used as a certification test, or method of compliance (MOC) to allow acceptability of the use of magnesium in the governing TSO-C127 and TSO-C39C. Other flammability studies are also cited in the AIR document to substantiate the FAA findings.
WIP Standard
2014-05-12
This SAE Recommended Practice is applicable to all liquid-to-air, liquid-to-liquid, air-to-liquid, and air-to-air heat exchangers used in vehicle and industrial cooling systems. This document outlines the tests to determine durability characteristics of the heat exchanger under thermal cycling. This document is to provide a test guideline for determining the durability of a heat exchanger under thermal cycle conditions.
Technical Paper
2014-05-10
Robert E Smith, Edward Lumsdaine
Since transient vehicle HVAC computational fluids (CFD) simulations take too long to solve in a production environment, the goal of this project is to automatically create a lumped-parameter flow network from a steady-state CFD that solves nearly instantaneously. The data mining algorithm k-means is implemented to automatically discover flow features and form the network (a reduced order model). The lumped-parameter network is implemented in the commercial thermal solver MuSES to then run as a fully transient simulation. Using this network a “localized heat transfer coefficient” is shown to be an improvement over existing techniques. Also, it was found that the use of the clustering created a new flow visualization technique. Finally, fixing clusters near equipment newly demonstrates a capability to track localized temperatures near specific objects (such as equipment in vehicles).
WIP Standard
2014-05-09
The information provided in SAE AIR825/6 applies to On Board Oxygen Generating Systems (OBOGS) - Molecular Sieve, that utilize the ability of molecular sieve materials by using Pressure Swing Adsorption Process (PSA) to separate and concentrate oxygen in the product gas from the surrounding air, respectively air provided by any compressor or by the aircraft engine (so called: Bleed Air), and to provide this oxygen enriched air or product gas as supplemental oxygen for breathing gas supply of crew and passengers onboard aircraft. The distribution system and the provided oxygen concentration have to fulfill the respective FAA/JAA regulations. Equipment using this technology to provide supplemental oxygen for breathing gas supply of crew and passengers onboard aircraft, the suitable breathing gas oxygen partial pressure or oxygen concentration requirements are specified in AIR825/2 and the oxygen purity requirements in AS8010. NOTE: OBOGS has never been certified for commercial aircraft. The FAR/JAR 25 as well as FAR 121/JAR-OPS need to be reviewed and if necessary amended prior to introduction of OBOGS.
WIP Standard
2014-05-08
This SAE Aerospace Recommended Practice (ARP) will provide general guidelines and procedures for servicing and maintaining oxygen systems. Such methods and procedures may be applied to gaseous, liquid, chemical and portable oxygen systems. These guidelines and recommendations will be provided to engineering and maintenance personnel for airlines, modification centers and third party maintenance contractors, to be used while performing maintenance on oxygen systems and components.
Magazine
2014-05-08
Executive Viewpoints Off-highway industry executives write about some of the challenges and trends facing the industry over the next 20 years, and the innovation that will be required to stay competitive and sustainable. Annual product guide A product roundup showcasing the newest and most innovative supplier technologies in a variety of areas such as Powertrain & Energy, Electronics, Hydraulics, Materials, Testing & Simulation, Body and Chassis, and Interiors.
Standard
2014-05-01
This SAE Aerospace Recommended Practice (ARP) contains methods used to measure the optical performance of airborne electronic flat panel display (FPD) systems. The methods described are specific to the direct view, liquid crystal matrix (x-y addressable) display technology used on aircraft flight decks. The focus of this document is on active matrix, liquid crystal displays (LCD). The majority of the procedures can be applied to other display technologies, however, it is cautioned that some techniques need to be tailored to different display technologies. The document covers monochrome and color LCD operation in the transmissive mode within the visual spectrum (the wavelength range of 380 to 780 nm). These procedures are adaptable to reflective and transflective displays paying special attention to the source illumination geometry. Photometric and colorimetric measurement procedures for airborne direct view CRT (cathode ray tube) displays are found in ARP1782. Optical measurement procedures for airborne head up displays (HUDs) can be found in ARP5287.
WIP Standard
2014-04-30
This SAE Aerospace Recommended Practice (ARP) provides guidance for the design and location of flight attendant stations, including emergency equipment installations at or near such stations, so as to enable the flight attendant to function effectively in emergency situations, including emergency evacuations. Recommendations regarding design of flight attendant stations apply to all such stations; recommendations regarding location apply to those stations located near or adjacent to floor level exits.
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