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Standard

Manufacturers' Identification of Aerospace Electrical and Electronic Wiring Devices and Accessories

2019-06-13
CURRENT
AIR1351J
This SAE Aerospace Information Report (AIR) covers the general requirements for, and the listing of, manufacturers’ identification markings, names, symbols or trademarks, and CAGE codes that appear on electrical and electronic wiring devices and accessories as required by individual product specifications. Supplier markings from previous submitted listings are maintained for component traceability.
Standard

Polyamide Type 6-6, Plastic Moldings and Extrusions

2019-06-13
CURRENT
AMS3617F
This specification covers one type of nylon thermoplastic resin in the form of moldings and extrusions. These products have been used typically for parts requiring high strength and resistance to aircraft fuels and lubricants up to 120 degrees C (248 degrees F), but usage is not limited to such applications.
Standard

Oil, Reference, for "L" Stock Rubber Testing

2019-06-13
WIP
AMS3020B
This specification covers a petroleum-base reference oil. This fluid has been typically used as a reference oil to estimate the ability of elastomeric compounds to conform to specified requirements after immersion at a specified temperature for a specified time and temperature as required by the material.
Article

Can the Air Force reach a 24-hour launch window?

2019-06-13
In a “sources sought” notice titled Rapid Space Launch Initiative, the service is reaching out to American space launch companies to identify technical risks and challenges and develop demonstrations that would result in a launch within 24 hours of a “call up,” versus weeks or months.
Technical Paper

Advanced Nanocomposite Low Adhesion Icephobic Coating for Aerospace Applications

2019-06-10
2019-01-1996
Icing is a major safety issue for flight operations in the civil, defense and space sectors. Ice can form on critical components during takeoff/landing, or while in service, depending on prevailing weather conditions. Aircraft manufacturers relies on two different approaches to prevent ice buildup using an active anti-icing system to melt ice buildup or deicing chemicals/ice repellent surface to minimize the buildup ice. The use of active anti-icing systems offers good protection, however can add significant penalty to overall weight, energy consumption and cost. Aerospace industry is in need for an advanced ice repellent surface to effectively minimize ice buildup on critical components with no modification to existing design can provide significant relief to ice prone systems.
Standard

Primer, Zinc Molybdate

2019-06-06
CURRENT
AMS3117A
This specification covers a zinc molybdate primer in the form of a liquid.
Technical Paper

Understanding the Stick Slip Behavior of Plastics and Target Setting: An OEM Perspective

2019-06-05
2019-01-1465
Automotive OEMs are aggressively using different materials for interiors due to value proposition and variety of options available for customers in market. Excessive usage of different grade plastics with zero gap philosophy can cause stick slip effect leading to squeak noise. Even though systems and subsystems are designed using best practices of structural design and manufacturing tolerances, extreme environmental conditions can induce contacts leading to squeak noise. Appropriate selection of interface material pairs can minimize the possibilities of squeak conditions. Stick-slip behavior of different plastics is discussed in the present study, along with critical parameters during material compatibility testing in a tribological test stand. Friction coefficient of different material pairs for a defined normal load and sliding velocity are analyzed for patterns to recognize squeaks versus time.
Technical Paper

Development of an Accelerated Test for Tire Flat-Spotting

2019-06-05
2019-01-1509
Tire flat-spotting occurs when tires remain in a loaded condition without rolling for an extended period of time, and can be temporary or permanent depending on the length of storage, vehicle loading and environmental factors. Tire non-uniformity caused from flat-spots often induce shake and shimmy vibration in vehicles due to increased tire-wheel force variation input into the chassis. This results in increased warranty costs for OEMs and tire suppliers and customer dis-satisfaction in third-party quality surveys such as J. D. Power IQS. Flat-spotting is of particular concern for slow-moving vehicle inventory parked for long periods at plants and/or dealership lots. OEMs often stipulate or recommend inventory storage practices for dealers that require physical movement of vehicles at some set duration to reduce the risk of tires developing permanent flat-spots.
Technical Paper

Acoustic Effects of Lightweighting in a Sport Utility Vehicle

2019-06-05
2019-01-1506
Weight reduction is a significant concern for automotive manufacturers, and is often achieved by removing as much mass as is safe from the structure of the vehicle. This has a negative effect on the interior acoustics, which has become more and more of an issue as technology has advanced and people expect to be able to do business and consume media in their vehicles. Traditional acoustic treatment tends to be very heavy, which eliminates some of the weight savings. Recently a vehicle study was performed to determine if the current production sound package in a highly-rated sport utility vehicle could be maintained or improved while reducing the weight. This paper presents the results of that study. The study focused on road noise transmitted through the floor (carpet, rear wheelhouse inner and trunk insulation) and engine noise transmitted through the dash (dash inner). Testing was performed both at the vehicle level on the road and at the component level in the laboratory.
Technical Paper

A Process to Improve Passenger Vehicle Sound and Vibration Quality Using a Combination of SPC and CAE Analysis

2019-06-05
2019-01-1520
A manufacturer of automotive equipment set out to implement a process to include sound and vibration quality targets for powertrain and road noise. CAE models have been successfully used in the early phase of the vehicle development process, but the use of these models to assess the customer’s subjective sound and vibration experience is often missing. The goal here was to use a CAE model driven by sound and vibration quality targets for early identification of problem areas based on jurors’ preference. These quality targets were cascaded via Source-Path-Contribution (SPC), and optimizations were performed to meet the targets using the CAE model.
Technical Paper

Comparing Interior Cabin SPL Suppression Performance Based on Vying Flat Sample Data and Requirements

2019-06-05
2019-01-1543
Since the vehicle development time becomes shorter and shorter every year in automobile industry, it is becoming more important for automotive engineers to be able to analyze each part going into a vehicle in early stage of development. Noise and Vibration (NV) engineers are often required to evaluate the performance of sound proof materials and quickly choose which one should be used in a vehicle being developed in the early stage. In a typical automobile development, Original Equipment Manufacturers (OEMs) and trim suppliers often communicate via flat sample performance, Insertion Loss and Absorption Coefficient, to decide which parts should be used for a vehicle. Flat sample data is valuable, since it shows the inherit characteristics of the layered product but should not be used as the only metric to decide which product goes into the automobile. The final metric for NV performance should be the Sound Pressure Level (SPL) suppression performance.
Technical Paper

Driveline NVH Integration of An NA Truck Program

2019-06-05
2019-01-1559
In the current automotive industry, it is common that the driveline subsystem and components are normally from different automotive suppliers for OEMs. In order to ensure proper system integration and successful development of driveline system NVH performances, collaboration efforts between OEMs and suppliers are very demanding and important. In this paper, a process is presented to achieve successfulness in developing and optimizing vehicle integration through effective teamwork between a driveline supplier and a major OEM. The development process includes multiple critical steps. They include target development and roll down, targets being specific and measurable, comprehension of interactions of driveline and vehicle dynamics, accurate definition of sensitivity, proper deployment of modal mapping strategy, which requires open data sharing; and system dynamics and optimization.
Technical Paper

New Half Shaft Bench Test Methodology for NVH Characterization

2019-06-05
2019-01-1558
The main purpose of this paper is to develop a reliable bench test to understand the vibratory behavior of the half shafts under applied torque comparable to an idle condition. In some cases, the half shaft path is a major factor influencing the idle vibration in the vehicle. At idle condition vehicle vibrations are caused by engine excitation and then they pass through different paths to the body structure. Half shaft manufacturers generally characterize shaft joints for their frictional behavior and typically there is no data for vibration characteristics of the half shaft under idle conditions. However, for predictive risk management, the vibratory behavior of the half shaft needs to be identified. This can be achieved from measured frequency response functions under preloaded test conditions.
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