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2017-06-05
Technical Paper
2017-01-1809
Dhanesh Purekar
Abstract Engine noise is one of the significant aspects of product quality for light and medium duty diesel engine market applications. Gear whine is one of those noise issues, which is considered objectionable and impacts the customer’s perception of the product quality. Gear whine could result due to defects in the gear manufacturing process and/or due to inaccurate design of the gear macro and micro geometry. The focus of this technical paper is to discuss gear whine considerations from the production plant perspective. This includes quick overview of the measurement process, test cell environment, noise acceptance criteria considerations. A gear whine case study is presented based on the data collected in the test cell at the engine plant. Gear whine data acquired on current product and next generation of prototype engines is analyzed and presented. This paper concludes by highlighting the lessons learned from the case study.
CURRENT
2017-06-05
Standard
AS14227D
SCOPE IS UNAVAILABLE.
CURRENT
2017-06-01
Standard
AMS7510/2C
This specification covers one type of samarium-cobalt permanent magnets.
CURRENT
2017-06-01
Standard
AMS5357D
This specification covers a corrosion-resistant steel in the form of investment castings.
CURRENT
2017-05-31
Standard
AMS7510C
This specification and its supplementary detail specifications cover commonly-available rare-earth/cobalt permanent magnets produced by powder metallurgy.
CURRENT
2017-05-30
Standard
AMS4021H
This specification covers an alclad aluminum alloy in the form of sheet and plate.
CURRENT
2017-05-30
Standard
AMS4416B
This specification covers an aluminum-lithium alloy in the form of extruded profiles 0.040 to 1.000 inch, incl in thickness (see 8.5).
CURRENT
2017-05-30
Standard
AMS4490K
This specification covers a magnesium alloy in the form of die castings.
2017-05-30
WIP Standard
AMS4478A
This specification covers an aluminum alloy in the form of Alclad sheet and plate supplied in the –T81/-T851 temper. These products have been used typically for high strength parts requiring higher yield strength than is afforded by naturally aged tempers of this alloy and maximum corrosion resistance and whose fabrication does not involve welding, but usage is not limited to such applications.
CURRENT
2017-05-30
Standard
AMS4009C
This specification covers an aluminum alloy in the form of foil.
2017-05-30
WIP Standard
AMS4467B
This specification covers an aluminum alloy in the form of alclad sheet and plate supplied in the -T861 temper.
2017-05-26
WIP Standard
ARP4977A
This SAE Aerospace Recommended Practice (ARP) describes standard methods for drying commercial aircraft composite structures prior to repair and gives general guidelines on use and applicability. It addresses the removal of liquids that have collected inside the structures through open damage, microcracks, or porosity and the removal of absorbed moisture from the composite material. The methods described in this document shall only be used when specified in an approved repair document or with the agreement of the original equipment manufacturer (OEM) or regulatory authority. If this document is used for the drying of materials other than thermosetting composite materials, the fitness for this purpose must be determined by the user. The purpose of this document is to provide a set of standard drying methods that may be referenced in repair documents produced by airlines or airframe and engine manufacturers.
CURRENT
2017-05-25
Standard
AMS4254C
This specification covers aluminum alloy sheet laminated with one or more layers of unidirectional aramid fiber/epoxy prepreg. The outer layers are always aluminum alloy.
CURRENT
2017-05-25
Standard
AMS4425D
This specification covers a magnesium alloy in the form of sand castings.
CURRENT
2017-05-25
Standard
AMS4148F
This specification covers an aluminum alloy in the form of die forgings and forging stock.
CURRENT
2017-05-25
Standard
AMS4266B
This specification covers an aluminum alloy powder metallurgy product in the form of sheet 0.010 to 0.250 inch (0.25 to 6.35 mm) in nominal thickness.

This sheet has been used typically for parts requiring a combination of intermediate strength, high modulus, and thermal stability up to 750 degrees F (399 degrees C), but usage is not limited to such applications.

CURRENT
2017-05-25
Standard
AMS4420P
This specification covers a magnesium alloy in the form of sand castings.
CURRENT
2017-05-25
Standard
AMS4631F
This specification covers one type of aluminum bronze in the form of rods, bars, forgings, and forging stock.
2017-05-25
Magazine
Small Form Factor Embedded Systems New Technologies Drive Diverse Solutions Making Laser Weapons a Reality Modelling and Simulation Tools for Systems Integration on Aircraft Rotorcraft Anti-Icing Systems Redundant Transmitting System in Aircraft (RTSA) Cassini Stays in Touch with NASA's Radio Science Subsystem Laser Integration on Silicon Photonic Circuits Through Transfer Printing New fabrication approach allows the massively parallel transfer of III-V coupons to a silicon photonic target wafer. High Energy Computed Tomographic Inspection of Munitions Inspection system provides additional level of quality assurance for R&D, reverse engineering, and malfunction investigations. Terahertz (THz) Radar: A Solution for Degraded Visibility Environments (DVE) Operating at higher frequencies than other types of radar produces tighter beams and finer resolution. Imaging Detonations of Explosives Using high-speed camera pyrometers to measure and map fireball/shock expansion velocities.
CURRENT
2017-05-25
Standard
AMS4036L
This specification covers an aluminum alloy in the form of sheet and plate clad on one side with a different aluminum alloy.
CURRENT
2017-05-25
Standard
AMS6529D
This specification covers a special aircraft-quality, low-alloy steel in the form of bars.
2017-05-24
Article
Structural adhesives are gaining applications as engineers employ them with lightweight materials to help achieve a continuous bond for improved vehicle rigidity and other benefits.
CURRENT
2017-05-24
Standard
AMS6950
This specification covers a titanium alloy in the form of bars and forgings 14.000 inches (355.60 mm) and under in nominal diameter or least distance between parallel sides and stock for forging.
CURRENT
2017-05-24
Standard
AIR5742A
The scope of this document is related to the particular needs of oxygen equipment with regards to packaging and transportation. The document provides guidance for handling chemical, gaseous and liquid oxygen equipment. It summarizes national and international regulations to be taken into account for transportation on land, sea and air and provides information on classification of hazardous material. The aim of this document is to summarize information on packaging and transportation of oxygen equipment. Statements and references to regulations cited herein are for information only and should not be considered as interpretation of a law. Processes to maintain cleanliness of components and subassemblies during processing and assembly or storage of work-in-progress are outside the scope of this document. Guidance on this can be obtained from ARP1176.
CURRENT
2017-05-22
Standard
AMS4302C
This specification covers an aluminum alloy in the form of sheet laminated with one or more layers of unidirectional aramid fiber/epoxy prepreg.
2017-05-20
Book
Rani Elhajjar
Additive Manufacturing of Aerospace Composite Structures: Fabrication and Reliability introduces the reader to the current state of technologies involved in processing and design of polymer-reinforced fiber composites using additive manufacturing’s automated fiber placement methods, through ten seminal SAE International papers. Currently, the material layup strategy in terms of process selection and manufacturability is usually not prioritized in the design phase. Engineers do not have a good way to see how their design choices can affect the manufacturing process beyond their initial structural-level considerations. The result is typically a large amount of experimental testing necessary to qualify the materials and structures typified in the classical building-block approach. Such an environment makes mistakes difficult to solve and, should redesign be required, obtaining reliable information is hard to piece together.
2017-05-19
Article
At Envisage, traditional coachbuilding skills blend with 3D printing and other digital tools to create concept/show vehicles and individual bespoke solutions.
CURRENT
2017-05-19
Standard
AMS4444E
This specification covers a magnesium alloy in the form of sand castings.
CURRENT
2017-05-18
Standard
AIR6130A
14-day material test to determine the cyclic effects of runway deicing compounds on cadmium plated parts.
2017-05-17
WIP Standard
AS2592A
This Aerospace Material Specification covers components of rotary flap assemblies, assembled by peening processors, to be used with portable equipment for peening of metal parts.
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